1 /* Updated: Karl MacMillan <kmacmillan@tresys.com> 2 * 3 * Added conditional policy language extensions 4 * 5 * Updated: Hewlett-Packard <paul.moore@hp.com> 6 * 7 * Added support for the policy capability bitmap 8 * 9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. 10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC 11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation, version 2. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/pagemap.h> 19 #include <linux/slab.h> 20 #include <linux/vmalloc.h> 21 #include <linux/fs.h> 22 #include <linux/mutex.h> 23 #include <linux/init.h> 24 #include <linux/string.h> 25 #include <linux/security.h> 26 #include <linux/major.h> 27 #include <linux/seq_file.h> 28 #include <linux/percpu.h> 29 #include <linux/audit.h> 30 #include <linux/uaccess.h> 31 32 /* selinuxfs pseudo filesystem for exporting the security policy API. 33 Based on the proc code and the fs/nfsd/nfsctl.c code. */ 34 35 #include "flask.h" 36 #include "avc.h" 37 #include "avc_ss.h" 38 #include "security.h" 39 #include "objsec.h" 40 #include "conditional.h" 41 42 /* Policy capability filenames */ 43 static char *policycap_names[] = { 44 "network_peer_controls", 45 "open_perms" 46 }; 47 48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; 49 50 static int __init checkreqprot_setup(char *str) 51 { 52 unsigned long checkreqprot; 53 if (!strict_strtoul(str, 0, &checkreqprot)) 54 selinux_checkreqprot = checkreqprot ? 1 : 0; 55 return 1; 56 } 57 __setup("checkreqprot=", checkreqprot_setup); 58 59 static DEFINE_MUTEX(sel_mutex); 60 61 /* global data for booleans */ 62 static struct dentry *bool_dir; 63 static int bool_num; 64 static char **bool_pending_names; 65 static int *bool_pending_values; 66 67 /* global data for classes */ 68 static struct dentry *class_dir; 69 static unsigned long last_class_ino; 70 71 /* global data for policy capabilities */ 72 static struct dentry *policycap_dir; 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 const struct task_security_struct *tsec; 81 u32 sid = 0; 82 83 rcu_read_lock(); 84 tsec = __task_cred(tsk)->security; 85 if (tsec) 86 sid = tsec->sid; 87 rcu_read_unlock(); 88 if (!tsec) 89 return -EACCES; 90 91 return avc_has_perm(sid, SECINITSID_SECURITY, 92 SECCLASS_SECURITY, perms, NULL); 93 } 94 95 enum sel_inos { 96 SEL_ROOT_INO = 2, 97 SEL_LOAD, /* load policy */ 98 SEL_ENFORCE, /* get or set enforcing status */ 99 SEL_CONTEXT, /* validate context */ 100 SEL_ACCESS, /* compute access decision */ 101 SEL_CREATE, /* compute create labeling decision */ 102 SEL_RELABEL, /* compute relabeling decision */ 103 SEL_USER, /* compute reachable user contexts */ 104 SEL_POLICYVERS, /* return policy version for this kernel */ 105 SEL_COMMIT_BOOLS, /* commit new boolean values */ 106 SEL_MLS, /* return if MLS policy is enabled */ 107 SEL_DISABLE, /* disable SELinux until next reboot */ 108 SEL_MEMBER, /* compute polyinstantiation membership decision */ 109 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ 110 SEL_COMPAT_NET, /* whether to use old compat network packet controls */ 111 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ 112 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ 113 SEL_INO_NEXT, /* The next inode number to use */ 114 }; 115 116 static unsigned long sel_last_ino = SEL_INO_NEXT - 1; 117 118 #define SEL_INITCON_INO_OFFSET 0x01000000 119 #define SEL_BOOL_INO_OFFSET 0x02000000 120 #define SEL_CLASS_INO_OFFSET 0x04000000 121 #define SEL_POLICYCAP_INO_OFFSET 0x08000000 122 #define SEL_INO_MASK 0x00ffffff 123 124 #define TMPBUFLEN 12 125 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, 126 size_t count, loff_t *ppos) 127 { 128 char tmpbuf[TMPBUFLEN]; 129 ssize_t length; 130 131 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); 132 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 133 } 134 135 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 136 static ssize_t sel_write_enforce(struct file *file, const char __user *buf, 137 size_t count, loff_t *ppos) 138 139 { 140 char *page; 141 ssize_t length; 142 int new_value; 143 144 if (count >= PAGE_SIZE) 145 return -ENOMEM; 146 if (*ppos != 0) { 147 /* No partial writes. */ 148 return -EINVAL; 149 } 150 page = (char *)get_zeroed_page(GFP_KERNEL); 151 if (!page) 152 return -ENOMEM; 153 length = -EFAULT; 154 if (copy_from_user(page, buf, count)) 155 goto out; 156 157 length = -EINVAL; 158 if (sscanf(page, "%d", &new_value) != 1) 159 goto out; 160 161 if (new_value != selinux_enforcing) { 162 length = task_has_security(current, SECURITY__SETENFORCE); 163 if (length) 164 goto out; 165 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 166 "enforcing=%d old_enforcing=%d auid=%u ses=%u", 167 new_value, selinux_enforcing, 168 audit_get_loginuid(current), 169 audit_get_sessionid(current)); 170 selinux_enforcing = new_value; 171 if (selinux_enforcing) 172 avc_ss_reset(0); 173 selnl_notify_setenforce(selinux_enforcing); 174 } 175 length = count; 176 out: 177 free_page((unsigned long) page); 178 return length; 179 } 180 #else 181 #define sel_write_enforce NULL 182 #endif 183 184 static const struct file_operations sel_enforce_ops = { 185 .read = sel_read_enforce, 186 .write = sel_write_enforce, 187 }; 188 189 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, 190 size_t count, loff_t *ppos) 191 { 192 char tmpbuf[TMPBUFLEN]; 193 ssize_t length; 194 ino_t ino = filp->f_path.dentry->d_inode->i_ino; 195 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? 196 security_get_reject_unknown() : !security_get_allow_unknown(); 197 198 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); 199 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 200 } 201 202 static const struct file_operations sel_handle_unknown_ops = { 203 .read = sel_read_handle_unknown, 204 }; 205 206 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 207 static ssize_t sel_write_disable(struct file *file, const char __user *buf, 208 size_t count, loff_t *ppos) 209 210 { 211 char *page; 212 ssize_t length; 213 int new_value; 214 extern int selinux_disable(void); 215 216 if (count >= PAGE_SIZE) 217 return -ENOMEM; 218 if (*ppos != 0) { 219 /* No partial writes. */ 220 return -EINVAL; 221 } 222 page = (char *)get_zeroed_page(GFP_KERNEL); 223 if (!page) 224 return -ENOMEM; 225 length = -EFAULT; 226 if (copy_from_user(page, buf, count)) 227 goto out; 228 229 length = -EINVAL; 230 if (sscanf(page, "%d", &new_value) != 1) 231 goto out; 232 233 if (new_value) { 234 length = selinux_disable(); 235 if (length < 0) 236 goto out; 237 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 238 "selinux=0 auid=%u ses=%u", 239 audit_get_loginuid(current), 240 audit_get_sessionid(current)); 241 } 242 243 length = count; 244 out: 245 free_page((unsigned long) page); 246 return length; 247 } 248 #else 249 #define sel_write_disable NULL 250 #endif 251 252 static const struct file_operations sel_disable_ops = { 253 .write = sel_write_disable, 254 }; 255 256 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, 257 size_t count, loff_t *ppos) 258 { 259 char tmpbuf[TMPBUFLEN]; 260 ssize_t length; 261 262 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); 263 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 264 } 265 266 static const struct file_operations sel_policyvers_ops = { 267 .read = sel_read_policyvers, 268 }; 269 270 /* declaration for sel_write_load */ 271 static int sel_make_bools(void); 272 static int sel_make_classes(void); 273 static int sel_make_policycap(void); 274 275 /* declaration for sel_make_class_dirs */ 276 static int sel_make_dir(struct inode *dir, struct dentry *dentry, 277 unsigned long *ino); 278 279 static ssize_t sel_read_mls(struct file *filp, char __user *buf, 280 size_t count, loff_t *ppos) 281 { 282 char tmpbuf[TMPBUFLEN]; 283 ssize_t length; 284 285 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", 286 security_mls_enabled()); 287 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 288 } 289 290 static const struct file_operations sel_mls_ops = { 291 .read = sel_read_mls, 292 }; 293 294 static ssize_t sel_write_load(struct file *file, const char __user *buf, 295 size_t count, loff_t *ppos) 296 297 { 298 int ret; 299 ssize_t length; 300 void *data = NULL; 301 302 mutex_lock(&sel_mutex); 303 304 length = task_has_security(current, SECURITY__LOAD_POLICY); 305 if (length) 306 goto out; 307 308 if (*ppos != 0) { 309 /* No partial writes. */ 310 length = -EINVAL; 311 goto out; 312 } 313 314 if ((count > 64 * 1024 * 1024) 315 || (data = vmalloc(count)) == NULL) { 316 length = -ENOMEM; 317 goto out; 318 } 319 320 length = -EFAULT; 321 if (copy_from_user(data, buf, count) != 0) 322 goto out; 323 324 length = security_load_policy(data, count); 325 if (length) 326 goto out; 327 328 ret = sel_make_bools(); 329 if (ret) { 330 length = ret; 331 goto out1; 332 } 333 334 ret = sel_make_classes(); 335 if (ret) { 336 length = ret; 337 goto out1; 338 } 339 340 ret = sel_make_policycap(); 341 if (ret) 342 length = ret; 343 else 344 length = count; 345 346 out1: 347 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, 348 "policy loaded auid=%u ses=%u", 349 audit_get_loginuid(current), 350 audit_get_sessionid(current)); 351 out: 352 mutex_unlock(&sel_mutex); 353 vfree(data); 354 return length; 355 } 356 357 static const struct file_operations sel_load_ops = { 358 .write = sel_write_load, 359 }; 360 361 static ssize_t sel_write_context(struct file *file, char *buf, size_t size) 362 { 363 char *canon; 364 u32 sid, len; 365 ssize_t length; 366 367 length = task_has_security(current, SECURITY__CHECK_CONTEXT); 368 if (length) 369 return length; 370 371 length = security_context_to_sid(buf, size, &sid); 372 if (length < 0) 373 return length; 374 375 length = security_sid_to_context(sid, &canon, &len); 376 if (length < 0) 377 return length; 378 379 if (len > SIMPLE_TRANSACTION_LIMIT) { 380 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 381 "payload max\n", __func__, len); 382 length = -ERANGE; 383 goto out; 384 } 385 386 memcpy(buf, canon, len); 387 length = len; 388 out: 389 kfree(canon); 390 return length; 391 } 392 393 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, 394 size_t count, loff_t *ppos) 395 { 396 char tmpbuf[TMPBUFLEN]; 397 ssize_t length; 398 399 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); 400 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 401 } 402 403 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, 404 size_t count, loff_t *ppos) 405 { 406 char *page; 407 ssize_t length; 408 unsigned int new_value; 409 410 length = task_has_security(current, SECURITY__SETCHECKREQPROT); 411 if (length) 412 return length; 413 414 if (count >= PAGE_SIZE) 415 return -ENOMEM; 416 if (*ppos != 0) { 417 /* No partial writes. */ 418 return -EINVAL; 419 } 420 page = (char *)get_zeroed_page(GFP_KERNEL); 421 if (!page) 422 return -ENOMEM; 423 length = -EFAULT; 424 if (copy_from_user(page, buf, count)) 425 goto out; 426 427 length = -EINVAL; 428 if (sscanf(page, "%u", &new_value) != 1) 429 goto out; 430 431 selinux_checkreqprot = new_value ? 1 : 0; 432 length = count; 433 out: 434 free_page((unsigned long) page); 435 return length; 436 } 437 static const struct file_operations sel_checkreqprot_ops = { 438 .read = sel_read_checkreqprot, 439 .write = sel_write_checkreqprot, 440 }; 441 442 /* 443 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c 444 */ 445 static ssize_t sel_write_access(struct file *file, char *buf, size_t size); 446 static ssize_t sel_write_create(struct file *file, char *buf, size_t size); 447 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); 448 static ssize_t sel_write_user(struct file *file, char *buf, size_t size); 449 static ssize_t sel_write_member(struct file *file, char *buf, size_t size); 450 451 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 452 [SEL_ACCESS] = sel_write_access, 453 [SEL_CREATE] = sel_write_create, 454 [SEL_RELABEL] = sel_write_relabel, 455 [SEL_USER] = sel_write_user, 456 [SEL_MEMBER] = sel_write_member, 457 [SEL_CONTEXT] = sel_write_context, 458 }; 459 460 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 461 { 462 ino_t ino = file->f_path.dentry->d_inode->i_ino; 463 char *data; 464 ssize_t rv; 465 466 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 467 return -EINVAL; 468 469 data = simple_transaction_get(file, buf, size); 470 if (IS_ERR(data)) 471 return PTR_ERR(data); 472 473 rv = write_op[ino](file, data, size); 474 if (rv > 0) { 475 simple_transaction_set(file, rv); 476 rv = size; 477 } 478 return rv; 479 } 480 481 static const struct file_operations transaction_ops = { 482 .write = selinux_transaction_write, 483 .read = simple_transaction_read, 484 .release = simple_transaction_release, 485 }; 486 487 /* 488 * payload - write methods 489 * If the method has a response, the response should be put in buf, 490 * and the length returned. Otherwise return 0 or and -error. 491 */ 492 493 static ssize_t sel_write_access(struct file *file, char *buf, size_t size) 494 { 495 char *scon, *tcon; 496 u32 ssid, tsid; 497 u16 tclass; 498 struct av_decision avd; 499 ssize_t length; 500 501 length = task_has_security(current, SECURITY__COMPUTE_AV); 502 if (length) 503 return length; 504 505 length = -ENOMEM; 506 scon = kzalloc(size+1, GFP_KERNEL); 507 if (!scon) 508 return length; 509 510 tcon = kzalloc(size+1, GFP_KERNEL); 511 if (!tcon) 512 goto out; 513 514 length = -EINVAL; 515 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 516 goto out2; 517 518 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 519 if (length < 0) 520 goto out2; 521 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 522 if (length < 0) 523 goto out2; 524 525 security_compute_av_user(ssid, tsid, tclass, &avd); 526 527 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, 528 "%x %x %x %x %u %x", 529 avd.allowed, 0xffffffff, 530 avd.auditallow, avd.auditdeny, 531 avd.seqno, avd.flags); 532 out2: 533 kfree(tcon); 534 out: 535 kfree(scon); 536 return length; 537 } 538 539 static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 540 { 541 char *scon, *tcon; 542 u32 ssid, tsid, newsid; 543 u16 tclass; 544 ssize_t length; 545 char *newcon; 546 u32 len; 547 548 length = task_has_security(current, SECURITY__COMPUTE_CREATE); 549 if (length) 550 return length; 551 552 length = -ENOMEM; 553 scon = kzalloc(size+1, GFP_KERNEL); 554 if (!scon) 555 return length; 556 557 tcon = kzalloc(size+1, GFP_KERNEL); 558 if (!tcon) 559 goto out; 560 561 length = -EINVAL; 562 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 563 goto out2; 564 565 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 566 if (length < 0) 567 goto out2; 568 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 569 if (length < 0) 570 goto out2; 571 572 length = security_transition_sid_user(ssid, tsid, tclass, &newsid); 573 if (length < 0) 574 goto out2; 575 576 length = security_sid_to_context(newsid, &newcon, &len); 577 if (length < 0) 578 goto out2; 579 580 if (len > SIMPLE_TRANSACTION_LIMIT) { 581 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 582 "payload max\n", __func__, len); 583 length = -ERANGE; 584 goto out3; 585 } 586 587 memcpy(buf, newcon, len); 588 length = len; 589 out3: 590 kfree(newcon); 591 out2: 592 kfree(tcon); 593 out: 594 kfree(scon); 595 return length; 596 } 597 598 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) 599 { 600 char *scon, *tcon; 601 u32 ssid, tsid, newsid; 602 u16 tclass; 603 ssize_t length; 604 char *newcon; 605 u32 len; 606 607 length = task_has_security(current, SECURITY__COMPUTE_RELABEL); 608 if (length) 609 return length; 610 611 length = -ENOMEM; 612 scon = kzalloc(size+1, GFP_KERNEL); 613 if (!scon) 614 return length; 615 616 tcon = kzalloc(size+1, GFP_KERNEL); 617 if (!tcon) 618 goto out; 619 620 length = -EINVAL; 621 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 622 goto out2; 623 624 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 625 if (length < 0) 626 goto out2; 627 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 628 if (length < 0) 629 goto out2; 630 631 length = security_change_sid(ssid, tsid, tclass, &newsid); 632 if (length < 0) 633 goto out2; 634 635 length = security_sid_to_context(newsid, &newcon, &len); 636 if (length < 0) 637 goto out2; 638 639 if (len > SIMPLE_TRANSACTION_LIMIT) { 640 length = -ERANGE; 641 goto out3; 642 } 643 644 memcpy(buf, newcon, len); 645 length = len; 646 out3: 647 kfree(newcon); 648 out2: 649 kfree(tcon); 650 out: 651 kfree(scon); 652 return length; 653 } 654 655 static ssize_t sel_write_user(struct file *file, char *buf, size_t size) 656 { 657 char *con, *user, *ptr; 658 u32 sid, *sids; 659 ssize_t length; 660 char *newcon; 661 int i, rc; 662 u32 len, nsids; 663 664 length = task_has_security(current, SECURITY__COMPUTE_USER); 665 if (length) 666 return length; 667 668 length = -ENOMEM; 669 con = kzalloc(size+1, GFP_KERNEL); 670 if (!con) 671 return length; 672 673 user = kzalloc(size+1, GFP_KERNEL); 674 if (!user) 675 goto out; 676 677 length = -EINVAL; 678 if (sscanf(buf, "%s %s", con, user) != 2) 679 goto out2; 680 681 length = security_context_to_sid(con, strlen(con)+1, &sid); 682 if (length < 0) 683 goto out2; 684 685 length = security_get_user_sids(sid, user, &sids, &nsids); 686 if (length < 0) 687 goto out2; 688 689 length = sprintf(buf, "%u", nsids) + 1; 690 ptr = buf + length; 691 for (i = 0; i < nsids; i++) { 692 rc = security_sid_to_context(sids[i], &newcon, &len); 693 if (rc) { 694 length = rc; 695 goto out3; 696 } 697 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { 698 kfree(newcon); 699 length = -ERANGE; 700 goto out3; 701 } 702 memcpy(ptr, newcon, len); 703 kfree(newcon); 704 ptr += len; 705 length += len; 706 } 707 out3: 708 kfree(sids); 709 out2: 710 kfree(user); 711 out: 712 kfree(con); 713 return length; 714 } 715 716 static ssize_t sel_write_member(struct file *file, char *buf, size_t size) 717 { 718 char *scon, *tcon; 719 u32 ssid, tsid, newsid; 720 u16 tclass; 721 ssize_t length; 722 char *newcon; 723 u32 len; 724 725 length = task_has_security(current, SECURITY__COMPUTE_MEMBER); 726 if (length) 727 return length; 728 729 length = -ENOMEM; 730 scon = kzalloc(size+1, GFP_KERNEL); 731 if (!scon) 732 return length; 733 734 tcon = kzalloc(size+1, GFP_KERNEL); 735 if (!tcon) 736 goto out; 737 738 length = -EINVAL; 739 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 740 goto out2; 741 742 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 743 if (length < 0) 744 goto out2; 745 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 746 if (length < 0) 747 goto out2; 748 749 length = security_member_sid(ssid, tsid, tclass, &newsid); 750 if (length < 0) 751 goto out2; 752 753 length = security_sid_to_context(newsid, &newcon, &len); 754 if (length < 0) 755 goto out2; 756 757 if (len > SIMPLE_TRANSACTION_LIMIT) { 758 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 759 "payload max\n", __func__, len); 760 length = -ERANGE; 761 goto out3; 762 } 763 764 memcpy(buf, newcon, len); 765 length = len; 766 out3: 767 kfree(newcon); 768 out2: 769 kfree(tcon); 770 out: 771 kfree(scon); 772 return length; 773 } 774 775 static struct inode *sel_make_inode(struct super_block *sb, int mode) 776 { 777 struct inode *ret = new_inode(sb); 778 779 if (ret) { 780 ret->i_mode = mode; 781 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 782 } 783 return ret; 784 } 785 786 static ssize_t sel_read_bool(struct file *filep, char __user *buf, 787 size_t count, loff_t *ppos) 788 { 789 char *page = NULL; 790 ssize_t length; 791 ssize_t ret; 792 int cur_enforcing; 793 struct inode *inode = filep->f_path.dentry->d_inode; 794 unsigned index = inode->i_ino & SEL_INO_MASK; 795 const char *name = filep->f_path.dentry->d_name.name; 796 797 mutex_lock(&sel_mutex); 798 799 if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 800 ret = -EINVAL; 801 goto out; 802 } 803 804 page = (char *)get_zeroed_page(GFP_KERNEL); 805 if (!page) { 806 ret = -ENOMEM; 807 goto out; 808 } 809 810 cur_enforcing = security_get_bool_value(index); 811 if (cur_enforcing < 0) { 812 ret = cur_enforcing; 813 goto out; 814 } 815 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, 816 bool_pending_values[index]); 817 ret = simple_read_from_buffer(buf, count, ppos, page, length); 818 out: 819 mutex_unlock(&sel_mutex); 820 if (page) 821 free_page((unsigned long)page); 822 return ret; 823 } 824 825 static ssize_t sel_write_bool(struct file *filep, const char __user *buf, 826 size_t count, loff_t *ppos) 827 { 828 char *page = NULL; 829 ssize_t length; 830 int new_value; 831 struct inode *inode = filep->f_path.dentry->d_inode; 832 unsigned index = inode->i_ino & SEL_INO_MASK; 833 const char *name = filep->f_path.dentry->d_name.name; 834 835 mutex_lock(&sel_mutex); 836 837 length = task_has_security(current, SECURITY__SETBOOL); 838 if (length) 839 goto out; 840 841 if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 842 length = -EINVAL; 843 goto out; 844 } 845 846 if (count >= PAGE_SIZE) { 847 length = -ENOMEM; 848 goto out; 849 } 850 851 if (*ppos != 0) { 852 /* No partial writes. */ 853 length = -EINVAL; 854 goto out; 855 } 856 page = (char *)get_zeroed_page(GFP_KERNEL); 857 if (!page) { 858 length = -ENOMEM; 859 goto out; 860 } 861 862 length = -EFAULT; 863 if (copy_from_user(page, buf, count)) 864 goto out; 865 866 length = -EINVAL; 867 if (sscanf(page, "%d", &new_value) != 1) 868 goto out; 869 870 if (new_value) 871 new_value = 1; 872 873 bool_pending_values[index] = new_value; 874 length = count; 875 876 out: 877 mutex_unlock(&sel_mutex); 878 if (page) 879 free_page((unsigned long) page); 880 return length; 881 } 882 883 static const struct file_operations sel_bool_ops = { 884 .read = sel_read_bool, 885 .write = sel_write_bool, 886 }; 887 888 static ssize_t sel_commit_bools_write(struct file *filep, 889 const char __user *buf, 890 size_t count, loff_t *ppos) 891 { 892 char *page = NULL; 893 ssize_t length; 894 int new_value; 895 896 mutex_lock(&sel_mutex); 897 898 length = task_has_security(current, SECURITY__SETBOOL); 899 if (length) 900 goto out; 901 902 if (count >= PAGE_SIZE) { 903 length = -ENOMEM; 904 goto out; 905 } 906 if (*ppos != 0) { 907 /* No partial writes. */ 908 goto out; 909 } 910 page = (char *)get_zeroed_page(GFP_KERNEL); 911 if (!page) { 912 length = -ENOMEM; 913 goto out; 914 } 915 916 length = -EFAULT; 917 if (copy_from_user(page, buf, count)) 918 goto out; 919 920 length = -EINVAL; 921 if (sscanf(page, "%d", &new_value) != 1) 922 goto out; 923 924 if (new_value && bool_pending_values) 925 security_set_bools(bool_num, bool_pending_values); 926 927 length = count; 928 929 out: 930 mutex_unlock(&sel_mutex); 931 if (page) 932 free_page((unsigned long) page); 933 return length; 934 } 935 936 static const struct file_operations sel_commit_bools_ops = { 937 .write = sel_commit_bools_write, 938 }; 939 940 static void sel_remove_entries(struct dentry *de) 941 { 942 struct list_head *node; 943 944 spin_lock(&dcache_lock); 945 node = de->d_subdirs.next; 946 while (node != &de->d_subdirs) { 947 struct dentry *d = list_entry(node, struct dentry, d_u.d_child); 948 list_del_init(node); 949 950 if (d->d_inode) { 951 d = dget_locked(d); 952 spin_unlock(&dcache_lock); 953 d_delete(d); 954 simple_unlink(de->d_inode, d); 955 dput(d); 956 spin_lock(&dcache_lock); 957 } 958 node = de->d_subdirs.next; 959 } 960 961 spin_unlock(&dcache_lock); 962 } 963 964 #define BOOL_DIR_NAME "booleans" 965 966 static int sel_make_bools(void) 967 { 968 int i, ret = 0; 969 ssize_t len; 970 struct dentry *dentry = NULL; 971 struct dentry *dir = bool_dir; 972 struct inode *inode = NULL; 973 struct inode_security_struct *isec; 974 char **names = NULL, *page; 975 int num; 976 int *values = NULL; 977 u32 sid; 978 979 /* remove any existing files */ 980 kfree(bool_pending_names); 981 kfree(bool_pending_values); 982 bool_pending_names = NULL; 983 bool_pending_values = NULL; 984 985 sel_remove_entries(dir); 986 987 page = (char *)get_zeroed_page(GFP_KERNEL); 988 if (!page) 989 return -ENOMEM; 990 991 ret = security_get_bools(&num, &names, &values); 992 if (ret != 0) 993 goto out; 994 995 for (i = 0; i < num; i++) { 996 dentry = d_alloc_name(dir, names[i]); 997 if (!dentry) { 998 ret = -ENOMEM; 999 goto err; 1000 } 1001 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); 1002 if (!inode) { 1003 ret = -ENOMEM; 1004 goto err; 1005 } 1006 1007 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); 1008 if (len < 0) { 1009 ret = -EINVAL; 1010 goto err; 1011 } else if (len >= PAGE_SIZE) { 1012 ret = -ENAMETOOLONG; 1013 goto err; 1014 } 1015 isec = (struct inode_security_struct *)inode->i_security; 1016 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); 1017 if (ret) 1018 goto err; 1019 isec->sid = sid; 1020 isec->initialized = 1; 1021 inode->i_fop = &sel_bool_ops; 1022 inode->i_ino = i|SEL_BOOL_INO_OFFSET; 1023 d_add(dentry, inode); 1024 } 1025 bool_num = num; 1026 bool_pending_names = names; 1027 bool_pending_values = values; 1028 out: 1029 free_page((unsigned long)page); 1030 return ret; 1031 err: 1032 if (names) { 1033 for (i = 0; i < num; i++) 1034 kfree(names[i]); 1035 kfree(names); 1036 } 1037 kfree(values); 1038 sel_remove_entries(dir); 1039 ret = -ENOMEM; 1040 goto out; 1041 } 1042 1043 #define NULL_FILE_NAME "null" 1044 1045 struct dentry *selinux_null; 1046 1047 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, 1048 size_t count, loff_t *ppos) 1049 { 1050 char tmpbuf[TMPBUFLEN]; 1051 ssize_t length; 1052 1053 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); 1054 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 1055 } 1056 1057 static ssize_t sel_write_avc_cache_threshold(struct file *file, 1058 const char __user *buf, 1059 size_t count, loff_t *ppos) 1060 1061 { 1062 char *page; 1063 ssize_t ret; 1064 int new_value; 1065 1066 if (count >= PAGE_SIZE) { 1067 ret = -ENOMEM; 1068 goto out; 1069 } 1070 1071 if (*ppos != 0) { 1072 /* No partial writes. */ 1073 ret = -EINVAL; 1074 goto out; 1075 } 1076 1077 page = (char *)get_zeroed_page(GFP_KERNEL); 1078 if (!page) { 1079 ret = -ENOMEM; 1080 goto out; 1081 } 1082 1083 if (copy_from_user(page, buf, count)) { 1084 ret = -EFAULT; 1085 goto out_free; 1086 } 1087 1088 if (sscanf(page, "%u", &new_value) != 1) { 1089 ret = -EINVAL; 1090 goto out; 1091 } 1092 1093 if (new_value != avc_cache_threshold) { 1094 ret = task_has_security(current, SECURITY__SETSECPARAM); 1095 if (ret) 1096 goto out_free; 1097 avc_cache_threshold = new_value; 1098 } 1099 ret = count; 1100 out_free: 1101 free_page((unsigned long)page); 1102 out: 1103 return ret; 1104 } 1105 1106 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, 1107 size_t count, loff_t *ppos) 1108 { 1109 char *page; 1110 ssize_t ret = 0; 1111 1112 page = (char *)__get_free_page(GFP_KERNEL); 1113 if (!page) { 1114 ret = -ENOMEM; 1115 goto out; 1116 } 1117 ret = avc_get_hash_stats(page); 1118 if (ret >= 0) 1119 ret = simple_read_from_buffer(buf, count, ppos, page, ret); 1120 free_page((unsigned long)page); 1121 out: 1122 return ret; 1123 } 1124 1125 static const struct file_operations sel_avc_cache_threshold_ops = { 1126 .read = sel_read_avc_cache_threshold, 1127 .write = sel_write_avc_cache_threshold, 1128 }; 1129 1130 static const struct file_operations sel_avc_hash_stats_ops = { 1131 .read = sel_read_avc_hash_stats, 1132 }; 1133 1134 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 1135 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) 1136 { 1137 int cpu; 1138 1139 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { 1140 if (!cpu_possible(cpu)) 1141 continue; 1142 *idx = cpu + 1; 1143 return &per_cpu(avc_cache_stats, cpu); 1144 } 1145 return NULL; 1146 } 1147 1148 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) 1149 { 1150 loff_t n = *pos - 1; 1151 1152 if (*pos == 0) 1153 return SEQ_START_TOKEN; 1154 1155 return sel_avc_get_stat_idx(&n); 1156 } 1157 1158 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1159 { 1160 return sel_avc_get_stat_idx(pos); 1161 } 1162 1163 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) 1164 { 1165 struct avc_cache_stats *st = v; 1166 1167 if (v == SEQ_START_TOKEN) 1168 seq_printf(seq, "lookups hits misses allocations reclaims " 1169 "frees\n"); 1170 else 1171 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, 1172 st->hits, st->misses, st->allocations, 1173 st->reclaims, st->frees); 1174 return 0; 1175 } 1176 1177 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) 1178 { } 1179 1180 static const struct seq_operations sel_avc_cache_stats_seq_ops = { 1181 .start = sel_avc_stats_seq_start, 1182 .next = sel_avc_stats_seq_next, 1183 .show = sel_avc_stats_seq_show, 1184 .stop = sel_avc_stats_seq_stop, 1185 }; 1186 1187 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) 1188 { 1189 return seq_open(file, &sel_avc_cache_stats_seq_ops); 1190 } 1191 1192 static const struct file_operations sel_avc_cache_stats_ops = { 1193 .open = sel_open_avc_cache_stats, 1194 .read = seq_read, 1195 .llseek = seq_lseek, 1196 .release = seq_release, 1197 }; 1198 #endif 1199 1200 static int sel_make_avc_files(struct dentry *dir) 1201 { 1202 int i, ret = 0; 1203 static struct tree_descr files[] = { 1204 { "cache_threshold", 1205 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, 1206 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, 1207 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 1208 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, 1209 #endif 1210 }; 1211 1212 for (i = 0; i < ARRAY_SIZE(files); i++) { 1213 struct inode *inode; 1214 struct dentry *dentry; 1215 1216 dentry = d_alloc_name(dir, files[i].name); 1217 if (!dentry) { 1218 ret = -ENOMEM; 1219 goto out; 1220 } 1221 1222 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); 1223 if (!inode) { 1224 ret = -ENOMEM; 1225 goto out; 1226 } 1227 inode->i_fop = files[i].ops; 1228 inode->i_ino = ++sel_last_ino; 1229 d_add(dentry, inode); 1230 } 1231 out: 1232 return ret; 1233 } 1234 1235 static ssize_t sel_read_initcon(struct file *file, char __user *buf, 1236 size_t count, loff_t *ppos) 1237 { 1238 struct inode *inode; 1239 char *con; 1240 u32 sid, len; 1241 ssize_t ret; 1242 1243 inode = file->f_path.dentry->d_inode; 1244 sid = inode->i_ino&SEL_INO_MASK; 1245 ret = security_sid_to_context(sid, &con, &len); 1246 if (ret < 0) 1247 return ret; 1248 1249 ret = simple_read_from_buffer(buf, count, ppos, con, len); 1250 kfree(con); 1251 return ret; 1252 } 1253 1254 static const struct file_operations sel_initcon_ops = { 1255 .read = sel_read_initcon, 1256 }; 1257 1258 static int sel_make_initcon_files(struct dentry *dir) 1259 { 1260 int i, ret = 0; 1261 1262 for (i = 1; i <= SECINITSID_NUM; i++) { 1263 struct inode *inode; 1264 struct dentry *dentry; 1265 dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); 1266 if (!dentry) { 1267 ret = -ENOMEM; 1268 goto out; 1269 } 1270 1271 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1272 if (!inode) { 1273 ret = -ENOMEM; 1274 goto out; 1275 } 1276 inode->i_fop = &sel_initcon_ops; 1277 inode->i_ino = i|SEL_INITCON_INO_OFFSET; 1278 d_add(dentry, inode); 1279 } 1280 out: 1281 return ret; 1282 } 1283 1284 static inline unsigned int sel_div(unsigned long a, unsigned long b) 1285 { 1286 return a / b - (a % b < 0); 1287 } 1288 1289 static inline unsigned long sel_class_to_ino(u16 class) 1290 { 1291 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; 1292 } 1293 1294 static inline u16 sel_ino_to_class(unsigned long ino) 1295 { 1296 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); 1297 } 1298 1299 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) 1300 { 1301 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; 1302 } 1303 1304 static inline u32 sel_ino_to_perm(unsigned long ino) 1305 { 1306 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); 1307 } 1308 1309 static ssize_t sel_read_class(struct file *file, char __user *buf, 1310 size_t count, loff_t *ppos) 1311 { 1312 ssize_t rc, len; 1313 char *page; 1314 unsigned long ino = file->f_path.dentry->d_inode->i_ino; 1315 1316 page = (char *)__get_free_page(GFP_KERNEL); 1317 if (!page) { 1318 rc = -ENOMEM; 1319 goto out; 1320 } 1321 1322 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); 1323 rc = simple_read_from_buffer(buf, count, ppos, page, len); 1324 free_page((unsigned long)page); 1325 out: 1326 return rc; 1327 } 1328 1329 static const struct file_operations sel_class_ops = { 1330 .read = sel_read_class, 1331 }; 1332 1333 static ssize_t sel_read_perm(struct file *file, char __user *buf, 1334 size_t count, loff_t *ppos) 1335 { 1336 ssize_t rc, len; 1337 char *page; 1338 unsigned long ino = file->f_path.dentry->d_inode->i_ino; 1339 1340 page = (char *)__get_free_page(GFP_KERNEL); 1341 if (!page) { 1342 rc = -ENOMEM; 1343 goto out; 1344 } 1345 1346 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); 1347 rc = simple_read_from_buffer(buf, count, ppos, page, len); 1348 free_page((unsigned long)page); 1349 out: 1350 return rc; 1351 } 1352 1353 static const struct file_operations sel_perm_ops = { 1354 .read = sel_read_perm, 1355 }; 1356 1357 static ssize_t sel_read_policycap(struct file *file, char __user *buf, 1358 size_t count, loff_t *ppos) 1359 { 1360 int value; 1361 char tmpbuf[TMPBUFLEN]; 1362 ssize_t length; 1363 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; 1364 1365 value = security_policycap_supported(i_ino & SEL_INO_MASK); 1366 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); 1367 1368 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 1369 } 1370 1371 static const struct file_operations sel_policycap_ops = { 1372 .read = sel_read_policycap, 1373 }; 1374 1375 static int sel_make_perm_files(char *objclass, int classvalue, 1376 struct dentry *dir) 1377 { 1378 int i, rc = 0, nperms; 1379 char **perms; 1380 1381 rc = security_get_permissions(objclass, &perms, &nperms); 1382 if (rc) 1383 goto out; 1384 1385 for (i = 0; i < nperms; i++) { 1386 struct inode *inode; 1387 struct dentry *dentry; 1388 1389 dentry = d_alloc_name(dir, perms[i]); 1390 if (!dentry) { 1391 rc = -ENOMEM; 1392 goto out1; 1393 } 1394 1395 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1396 if (!inode) { 1397 rc = -ENOMEM; 1398 goto out1; 1399 } 1400 inode->i_fop = &sel_perm_ops; 1401 /* i+1 since perm values are 1-indexed */ 1402 inode->i_ino = sel_perm_to_ino(classvalue, i+1); 1403 d_add(dentry, inode); 1404 } 1405 1406 out1: 1407 for (i = 0; i < nperms; i++) 1408 kfree(perms[i]); 1409 kfree(perms); 1410 out: 1411 return rc; 1412 } 1413 1414 static int sel_make_class_dir_entries(char *classname, int index, 1415 struct dentry *dir) 1416 { 1417 struct dentry *dentry = NULL; 1418 struct inode *inode = NULL; 1419 int rc; 1420 1421 dentry = d_alloc_name(dir, "index"); 1422 if (!dentry) { 1423 rc = -ENOMEM; 1424 goto out; 1425 } 1426 1427 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1428 if (!inode) { 1429 rc = -ENOMEM; 1430 goto out; 1431 } 1432 1433 inode->i_fop = &sel_class_ops; 1434 inode->i_ino = sel_class_to_ino(index); 1435 d_add(dentry, inode); 1436 1437 dentry = d_alloc_name(dir, "perms"); 1438 if (!dentry) { 1439 rc = -ENOMEM; 1440 goto out; 1441 } 1442 1443 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); 1444 if (rc) 1445 goto out; 1446 1447 rc = sel_make_perm_files(classname, index, dentry); 1448 1449 out: 1450 return rc; 1451 } 1452 1453 static void sel_remove_classes(void) 1454 { 1455 struct list_head *class_node; 1456 1457 list_for_each(class_node, &class_dir->d_subdirs) { 1458 struct dentry *class_subdir = list_entry(class_node, 1459 struct dentry, d_u.d_child); 1460 struct list_head *class_subdir_node; 1461 1462 list_for_each(class_subdir_node, &class_subdir->d_subdirs) { 1463 struct dentry *d = list_entry(class_subdir_node, 1464 struct dentry, d_u.d_child); 1465 1466 if (d->d_inode) 1467 if (d->d_inode->i_mode & S_IFDIR) 1468 sel_remove_entries(d); 1469 } 1470 1471 sel_remove_entries(class_subdir); 1472 } 1473 1474 sel_remove_entries(class_dir); 1475 } 1476 1477 static int sel_make_classes(void) 1478 { 1479 int rc = 0, nclasses, i; 1480 char **classes; 1481 1482 /* delete any existing entries */ 1483 sel_remove_classes(); 1484 1485 rc = security_get_classes(&classes, &nclasses); 1486 if (rc < 0) 1487 goto out; 1488 1489 /* +2 since classes are 1-indexed */ 1490 last_class_ino = sel_class_to_ino(nclasses+2); 1491 1492 for (i = 0; i < nclasses; i++) { 1493 struct dentry *class_name_dir; 1494 1495 class_name_dir = d_alloc_name(class_dir, classes[i]); 1496 if (!class_name_dir) { 1497 rc = -ENOMEM; 1498 goto out1; 1499 } 1500 1501 rc = sel_make_dir(class_dir->d_inode, class_name_dir, 1502 &last_class_ino); 1503 if (rc) 1504 goto out1; 1505 1506 /* i+1 since class values are 1-indexed */ 1507 rc = sel_make_class_dir_entries(classes[i], i+1, 1508 class_name_dir); 1509 if (rc) 1510 goto out1; 1511 } 1512 1513 out1: 1514 for (i = 0; i < nclasses; i++) 1515 kfree(classes[i]); 1516 kfree(classes); 1517 out: 1518 return rc; 1519 } 1520 1521 static int sel_make_policycap(void) 1522 { 1523 unsigned int iter; 1524 struct dentry *dentry = NULL; 1525 struct inode *inode = NULL; 1526 1527 sel_remove_entries(policycap_dir); 1528 1529 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { 1530 if (iter < ARRAY_SIZE(policycap_names)) 1531 dentry = d_alloc_name(policycap_dir, 1532 policycap_names[iter]); 1533 else 1534 dentry = d_alloc_name(policycap_dir, "unknown"); 1535 1536 if (dentry == NULL) 1537 return -ENOMEM; 1538 1539 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); 1540 if (inode == NULL) 1541 return -ENOMEM; 1542 1543 inode->i_fop = &sel_policycap_ops; 1544 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; 1545 d_add(dentry, inode); 1546 } 1547 1548 return 0; 1549 } 1550 1551 static int sel_make_dir(struct inode *dir, struct dentry *dentry, 1552 unsigned long *ino) 1553 { 1554 int ret = 0; 1555 struct inode *inode; 1556 1557 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); 1558 if (!inode) { 1559 ret = -ENOMEM; 1560 goto out; 1561 } 1562 inode->i_op = &simple_dir_inode_operations; 1563 inode->i_fop = &simple_dir_operations; 1564 inode->i_ino = ++(*ino); 1565 /* directory inodes start off with i_nlink == 2 (for "." entry) */ 1566 inc_nlink(inode); 1567 d_add(dentry, inode); 1568 /* bump link count on parent directory, too */ 1569 inc_nlink(dir); 1570 out: 1571 return ret; 1572 } 1573 1574 static int sel_fill_super(struct super_block *sb, void *data, int silent) 1575 { 1576 int ret; 1577 struct dentry *dentry; 1578 struct inode *inode, *root_inode; 1579 struct inode_security_struct *isec; 1580 1581 static struct tree_descr selinux_files[] = { 1582 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, 1583 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, 1584 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, 1585 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, 1586 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, 1587 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, 1588 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, 1589 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, 1590 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, 1591 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, 1592 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, 1593 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, 1594 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, 1595 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, 1596 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, 1597 /* last one */ {""} 1598 }; 1599 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); 1600 if (ret) 1601 goto err; 1602 1603 root_inode = sb->s_root->d_inode; 1604 1605 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); 1606 if (!dentry) { 1607 ret = -ENOMEM; 1608 goto err; 1609 } 1610 1611 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1612 if (ret) 1613 goto err; 1614 1615 bool_dir = dentry; 1616 1617 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); 1618 if (!dentry) { 1619 ret = -ENOMEM; 1620 goto err; 1621 } 1622 1623 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); 1624 if (!inode) { 1625 ret = -ENOMEM; 1626 goto err; 1627 } 1628 inode->i_ino = ++sel_last_ino; 1629 isec = (struct inode_security_struct *)inode->i_security; 1630 isec->sid = SECINITSID_DEVNULL; 1631 isec->sclass = SECCLASS_CHR_FILE; 1632 isec->initialized = 1; 1633 1634 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); 1635 d_add(dentry, inode); 1636 selinux_null = dentry; 1637 1638 dentry = d_alloc_name(sb->s_root, "avc"); 1639 if (!dentry) { 1640 ret = -ENOMEM; 1641 goto err; 1642 } 1643 1644 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1645 if (ret) 1646 goto err; 1647 1648 ret = sel_make_avc_files(dentry); 1649 if (ret) 1650 goto err; 1651 1652 dentry = d_alloc_name(sb->s_root, "initial_contexts"); 1653 if (!dentry) { 1654 ret = -ENOMEM; 1655 goto err; 1656 } 1657 1658 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1659 if (ret) 1660 goto err; 1661 1662 ret = sel_make_initcon_files(dentry); 1663 if (ret) 1664 goto err; 1665 1666 dentry = d_alloc_name(sb->s_root, "class"); 1667 if (!dentry) { 1668 ret = -ENOMEM; 1669 goto err; 1670 } 1671 1672 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1673 if (ret) 1674 goto err; 1675 1676 class_dir = dentry; 1677 1678 dentry = d_alloc_name(sb->s_root, "policy_capabilities"); 1679 if (!dentry) { 1680 ret = -ENOMEM; 1681 goto err; 1682 } 1683 1684 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1685 if (ret) 1686 goto err; 1687 1688 policycap_dir = dentry; 1689 1690 out: 1691 return ret; 1692 err: 1693 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", 1694 __func__); 1695 goto out; 1696 } 1697 1698 static int sel_get_sb(struct file_system_type *fs_type, 1699 int flags, const char *dev_name, void *data, 1700 struct vfsmount *mnt) 1701 { 1702 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); 1703 } 1704 1705 static struct file_system_type sel_fs_type = { 1706 .name = "selinuxfs", 1707 .get_sb = sel_get_sb, 1708 .kill_sb = kill_litter_super, 1709 }; 1710 1711 struct vfsmount *selinuxfs_mount; 1712 1713 static int __init init_sel_fs(void) 1714 { 1715 int err; 1716 1717 if (!selinux_enabled) 1718 return 0; 1719 err = register_filesystem(&sel_fs_type); 1720 if (!err) { 1721 selinuxfs_mount = kern_mount(&sel_fs_type); 1722 if (IS_ERR(selinuxfs_mount)) { 1723 printk(KERN_ERR "selinuxfs: could not mount!\n"); 1724 err = PTR_ERR(selinuxfs_mount); 1725 selinuxfs_mount = NULL; 1726 } 1727 } 1728 return err; 1729 } 1730 1731 __initcall(init_sel_fs); 1732 1733 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 1734 void exit_sel_fs(void) 1735 { 1736 unregister_filesystem(&sel_fs_type); 1737 } 1738 #endif 1739