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