1 /* Updated: Karl MacMillan <kmacmillan@tresys.com> 2 * 3 * Added conditional policy language extensions 4 * 5 * Updated: Hewlett-Packard <paul.moore@hp.com> 6 * 7 * Added support for the policy capability bitmap 8 * 9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. 10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC 11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation, version 2. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/pagemap.h> 19 #include <linux/slab.h> 20 #include <linux/vmalloc.h> 21 #include <linux/fs.h> 22 #include <linux/mutex.h> 23 #include <linux/init.h> 24 #include <linux/string.h> 25 #include <linux/security.h> 26 #include <linux/major.h> 27 #include <linux/seq_file.h> 28 #include <linux/percpu.h> 29 #include <linux/audit.h> 30 #include <linux/uaccess.h> 31 32 /* selinuxfs pseudo filesystem for exporting the security policy API. 33 Based on the proc code and the fs/nfsd/nfsctl.c code. */ 34 35 #include "flask.h" 36 #include "avc.h" 37 #include "avc_ss.h" 38 #include "security.h" 39 #include "objsec.h" 40 #include "conditional.h" 41 42 /* Policy capability filenames */ 43 static char *policycap_names[] = { 44 "network_peer_controls", 45 "open_perms" 46 }; 47 48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; 49 50 int selinux_compat_net = 0; 51 52 static int __init checkreqprot_setup(char *str) 53 { 54 unsigned long checkreqprot; 55 if (!strict_strtoul(str, 0, &checkreqprot)) 56 selinux_checkreqprot = checkreqprot ? 1 : 0; 57 return 1; 58 } 59 __setup("checkreqprot=", checkreqprot_setup); 60 61 static int __init selinux_compat_net_setup(char *str) 62 { 63 unsigned long compat_net; 64 if (!strict_strtoul(str, 0, &compat_net)) 65 selinux_compat_net = compat_net ? 1 : 0; 66 return 1; 67 } 68 __setup("selinux_compat_net=", selinux_compat_net_setup); 69 70 71 static DEFINE_MUTEX(sel_mutex); 72 73 /* global data for booleans */ 74 static struct dentry *bool_dir; 75 static int bool_num; 76 static char **bool_pending_names; 77 static int *bool_pending_values; 78 79 /* global data for classes */ 80 static struct dentry *class_dir; 81 static unsigned long last_class_ino; 82 83 /* global data for policy capabilities */ 84 static struct dentry *policycap_dir; 85 86 extern void selnl_notify_setenforce(int val); 87 88 /* Check whether a task is allowed to use a security operation. */ 89 static int task_has_security(struct task_struct *tsk, 90 u32 perms) 91 { 92 const struct task_security_struct *tsec; 93 u32 sid = 0; 94 95 rcu_read_lock(); 96 tsec = __task_cred(tsk)->security; 97 if (tsec) 98 sid = tsec->sid; 99 rcu_read_unlock(); 100 if (!tsec) 101 return -EACCES; 102 103 return avc_has_perm(sid, SECINITSID_SECURITY, 104 SECCLASS_SECURITY, perms, NULL); 105 } 106 107 enum sel_inos { 108 SEL_ROOT_INO = 2, 109 SEL_LOAD, /* load policy */ 110 SEL_ENFORCE, /* get or set enforcing status */ 111 SEL_CONTEXT, /* validate context */ 112 SEL_ACCESS, /* compute access decision */ 113 SEL_CREATE, /* compute create labeling decision */ 114 SEL_RELABEL, /* compute relabeling decision */ 115 SEL_USER, /* compute reachable user contexts */ 116 SEL_POLICYVERS, /* return policy version for this kernel */ 117 SEL_COMMIT_BOOLS, /* commit new boolean values */ 118 SEL_MLS, /* return if MLS policy is enabled */ 119 SEL_DISABLE, /* disable SELinux until next reboot */ 120 SEL_MEMBER, /* compute polyinstantiation membership decision */ 121 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ 122 SEL_COMPAT_NET, /* whether to use old compat network packet controls */ 123 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ 124 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ 125 SEL_INO_NEXT, /* The next inode number to use */ 126 }; 127 128 static unsigned long sel_last_ino = SEL_INO_NEXT - 1; 129 130 #define SEL_INITCON_INO_OFFSET 0x01000000 131 #define SEL_BOOL_INO_OFFSET 0x02000000 132 #define SEL_CLASS_INO_OFFSET 0x04000000 133 #define SEL_POLICYCAP_INO_OFFSET 0x08000000 134 #define SEL_INO_MASK 0x00ffffff 135 136 #define TMPBUFLEN 12 137 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, 138 size_t count, loff_t *ppos) 139 { 140 char tmpbuf[TMPBUFLEN]; 141 ssize_t length; 142 143 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); 144 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 145 } 146 147 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 148 static ssize_t sel_write_enforce(struct file *file, const char __user *buf, 149 size_t count, loff_t *ppos) 150 151 { 152 char *page; 153 ssize_t length; 154 int new_value; 155 156 if (count >= PAGE_SIZE) 157 return -ENOMEM; 158 if (*ppos != 0) { 159 /* No partial writes. */ 160 return -EINVAL; 161 } 162 page = (char *)get_zeroed_page(GFP_KERNEL); 163 if (!page) 164 return -ENOMEM; 165 length = -EFAULT; 166 if (copy_from_user(page, buf, count)) 167 goto out; 168 169 length = -EINVAL; 170 if (sscanf(page, "%d", &new_value) != 1) 171 goto out; 172 173 if (new_value != selinux_enforcing) { 174 length = task_has_security(current, SECURITY__SETENFORCE); 175 if (length) 176 goto out; 177 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 178 "enforcing=%d old_enforcing=%d auid=%u ses=%u", 179 new_value, selinux_enforcing, 180 audit_get_loginuid(current), 181 audit_get_sessionid(current)); 182 selinux_enforcing = new_value; 183 if (selinux_enforcing) 184 avc_ss_reset(0); 185 selnl_notify_setenforce(selinux_enforcing); 186 } 187 length = count; 188 out: 189 free_page((unsigned long) page); 190 return length; 191 } 192 #else 193 #define sel_write_enforce NULL 194 #endif 195 196 static const struct file_operations sel_enforce_ops = { 197 .read = sel_read_enforce, 198 .write = sel_write_enforce, 199 }; 200 201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, 202 size_t count, loff_t *ppos) 203 { 204 char tmpbuf[TMPBUFLEN]; 205 ssize_t length; 206 ino_t ino = filp->f_path.dentry->d_inode->i_ino; 207 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? 208 security_get_reject_unknown() : !security_get_allow_unknown(); 209 210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); 211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 212 } 213 214 static const struct file_operations sel_handle_unknown_ops = { 215 .read = sel_read_handle_unknown, 216 }; 217 218 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 219 static ssize_t sel_write_disable(struct file *file, const char __user *buf, 220 size_t count, loff_t *ppos) 221 222 { 223 char *page; 224 ssize_t length; 225 int new_value; 226 extern int selinux_disable(void); 227 228 if (count >= PAGE_SIZE) 229 return -ENOMEM; 230 if (*ppos != 0) { 231 /* No partial writes. */ 232 return -EINVAL; 233 } 234 page = (char *)get_zeroed_page(GFP_KERNEL); 235 if (!page) 236 return -ENOMEM; 237 length = -EFAULT; 238 if (copy_from_user(page, buf, count)) 239 goto out; 240 241 length = -EINVAL; 242 if (sscanf(page, "%d", &new_value) != 1) 243 goto out; 244 245 if (new_value) { 246 length = selinux_disable(); 247 if (length < 0) 248 goto out; 249 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 250 "selinux=0 auid=%u ses=%u", 251 audit_get_loginuid(current), 252 audit_get_sessionid(current)); 253 } 254 255 length = count; 256 out: 257 free_page((unsigned long) page); 258 return length; 259 } 260 #else 261 #define sel_write_disable NULL 262 #endif 263 264 static const struct file_operations sel_disable_ops = { 265 .write = sel_write_disable, 266 }; 267 268 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, 269 size_t count, loff_t *ppos) 270 { 271 char tmpbuf[TMPBUFLEN]; 272 ssize_t length; 273 274 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); 275 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 276 } 277 278 static const struct file_operations sel_policyvers_ops = { 279 .read = sel_read_policyvers, 280 }; 281 282 /* declaration for sel_write_load */ 283 static int sel_make_bools(void); 284 static int sel_make_classes(void); 285 static int sel_make_policycap(void); 286 287 /* declaration for sel_make_class_dirs */ 288 static int sel_make_dir(struct inode *dir, struct dentry *dentry, 289 unsigned long *ino); 290 291 static ssize_t sel_read_mls(struct file *filp, char __user *buf, 292 size_t count, loff_t *ppos) 293 { 294 char tmpbuf[TMPBUFLEN]; 295 ssize_t length; 296 297 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); 298 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 299 } 300 301 static const struct file_operations sel_mls_ops = { 302 .read = sel_read_mls, 303 }; 304 305 static ssize_t sel_write_load(struct file *file, const char __user *buf, 306 size_t count, loff_t *ppos) 307 308 { 309 int ret; 310 ssize_t length; 311 void *data = NULL; 312 313 mutex_lock(&sel_mutex); 314 315 length = task_has_security(current, SECURITY__LOAD_POLICY); 316 if (length) 317 goto out; 318 319 if (*ppos != 0) { 320 /* No partial writes. */ 321 length = -EINVAL; 322 goto out; 323 } 324 325 if ((count > 64 * 1024 * 1024) 326 || (data = vmalloc(count)) == NULL) { 327 length = -ENOMEM; 328 goto out; 329 } 330 331 length = -EFAULT; 332 if (copy_from_user(data, buf, count) != 0) 333 goto out; 334 335 length = security_load_policy(data, count); 336 if (length) 337 goto out; 338 339 ret = sel_make_bools(); 340 if (ret) { 341 length = ret; 342 goto out1; 343 } 344 345 ret = sel_make_classes(); 346 if (ret) { 347 length = ret; 348 goto out1; 349 } 350 351 ret = sel_make_policycap(); 352 if (ret) 353 length = ret; 354 else 355 length = count; 356 357 out1: 358 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, 359 "policy loaded auid=%u ses=%u", 360 audit_get_loginuid(current), 361 audit_get_sessionid(current)); 362 out: 363 mutex_unlock(&sel_mutex); 364 vfree(data); 365 return length; 366 } 367 368 static const struct file_operations sel_load_ops = { 369 .write = sel_write_load, 370 }; 371 372 static ssize_t sel_write_context(struct file *file, char *buf, size_t size) 373 { 374 char *canon; 375 u32 sid, len; 376 ssize_t length; 377 378 length = task_has_security(current, SECURITY__CHECK_CONTEXT); 379 if (length) 380 return length; 381 382 length = security_context_to_sid(buf, size, &sid); 383 if (length < 0) 384 return length; 385 386 length = security_sid_to_context(sid, &canon, &len); 387 if (length < 0) 388 return length; 389 390 if (len > SIMPLE_TRANSACTION_LIMIT) { 391 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 392 "payload max\n", __func__, len); 393 length = -ERANGE; 394 goto out; 395 } 396 397 memcpy(buf, canon, len); 398 length = len; 399 out: 400 kfree(canon); 401 return length; 402 } 403 404 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, 405 size_t count, loff_t *ppos) 406 { 407 char tmpbuf[TMPBUFLEN]; 408 ssize_t length; 409 410 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); 411 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 412 } 413 414 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, 415 size_t count, loff_t *ppos) 416 { 417 char *page; 418 ssize_t length; 419 unsigned int new_value; 420 421 length = task_has_security(current, SECURITY__SETCHECKREQPROT); 422 if (length) 423 return length; 424 425 if (count >= PAGE_SIZE) 426 return -ENOMEM; 427 if (*ppos != 0) { 428 /* No partial writes. */ 429 return -EINVAL; 430 } 431 page = (char *)get_zeroed_page(GFP_KERNEL); 432 if (!page) 433 return -ENOMEM; 434 length = -EFAULT; 435 if (copy_from_user(page, buf, count)) 436 goto out; 437 438 length = -EINVAL; 439 if (sscanf(page, "%u", &new_value) != 1) 440 goto out; 441 442 selinux_checkreqprot = new_value ? 1 : 0; 443 length = count; 444 out: 445 free_page((unsigned long) page); 446 return length; 447 } 448 static const struct file_operations sel_checkreqprot_ops = { 449 .read = sel_read_checkreqprot, 450 .write = sel_write_checkreqprot, 451 }; 452 453 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf, 454 size_t count, loff_t *ppos) 455 { 456 char tmpbuf[TMPBUFLEN]; 457 ssize_t length; 458 459 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net); 460 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 461 } 462 463 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf, 464 size_t count, loff_t *ppos) 465 { 466 char *page; 467 ssize_t length; 468 int new_value; 469 470 length = task_has_security(current, SECURITY__LOAD_POLICY); 471 if (length) 472 return length; 473 474 if (count >= PAGE_SIZE) 475 return -ENOMEM; 476 if (*ppos != 0) { 477 /* No partial writes. */ 478 return -EINVAL; 479 } 480 page = (char *)get_zeroed_page(GFP_KERNEL); 481 if (!page) 482 return -ENOMEM; 483 length = -EFAULT; 484 if (copy_from_user(page, buf, count)) 485 goto out; 486 487 length = -EINVAL; 488 if (sscanf(page, "%d", &new_value) != 1) 489 goto out; 490 491 if (new_value) { 492 printk(KERN_NOTICE 493 "SELinux: compat_net is deprecated, please use secmark" 494 " instead\n"); 495 selinux_compat_net = 1; 496 } else 497 selinux_compat_net = 0; 498 length = count; 499 out: 500 free_page((unsigned long) page); 501 return length; 502 } 503 static const struct file_operations sel_compat_net_ops = { 504 .read = sel_read_compat_net, 505 .write = sel_write_compat_net, 506 }; 507 508 /* 509 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c 510 */ 511 static ssize_t sel_write_access(struct file *file, char *buf, size_t size); 512 static ssize_t sel_write_create(struct file *file, char *buf, size_t size); 513 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); 514 static ssize_t sel_write_user(struct file *file, char *buf, size_t size); 515 static ssize_t sel_write_member(struct file *file, char *buf, size_t size); 516 517 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 518 [SEL_ACCESS] = sel_write_access, 519 [SEL_CREATE] = sel_write_create, 520 [SEL_RELABEL] = sel_write_relabel, 521 [SEL_USER] = sel_write_user, 522 [SEL_MEMBER] = sel_write_member, 523 [SEL_CONTEXT] = sel_write_context, 524 }; 525 526 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 527 { 528 ino_t ino = file->f_path.dentry->d_inode->i_ino; 529 char *data; 530 ssize_t rv; 531 532 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 533 return -EINVAL; 534 535 data = simple_transaction_get(file, buf, size); 536 if (IS_ERR(data)) 537 return PTR_ERR(data); 538 539 rv = write_op[ino](file, data, size); 540 if (rv > 0) { 541 simple_transaction_set(file, rv); 542 rv = size; 543 } 544 return rv; 545 } 546 547 static const struct file_operations transaction_ops = { 548 .write = selinux_transaction_write, 549 .read = simple_transaction_read, 550 .release = simple_transaction_release, 551 }; 552 553 /* 554 * payload - write methods 555 * If the method has a response, the response should be put in buf, 556 * and the length returned. Otherwise return 0 or and -error. 557 */ 558 559 static ssize_t sel_write_access(struct file *file, char *buf, size_t size) 560 { 561 char *scon, *tcon; 562 u32 ssid, tsid; 563 u16 tclass; 564 u32 req; 565 struct av_decision avd; 566 ssize_t length; 567 568 length = task_has_security(current, SECURITY__COMPUTE_AV); 569 if (length) 570 return length; 571 572 length = -ENOMEM; 573 scon = kzalloc(size+1, GFP_KERNEL); 574 if (!scon) 575 return length; 576 577 tcon = kzalloc(size+1, GFP_KERNEL); 578 if (!tcon) 579 goto out; 580 581 length = -EINVAL; 582 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) 583 goto out2; 584 585 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 586 if (length < 0) 587 goto out2; 588 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 589 if (length < 0) 590 goto out2; 591 592 length = security_compute_av(ssid, tsid, tclass, req, &avd); 593 if (length < 0) 594 goto out2; 595 596 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, 597 "%x %x %x %x %u", 598 avd.allowed, avd.decided, 599 avd.auditallow, avd.auditdeny, 600 avd.seqno); 601 out2: 602 kfree(tcon); 603 out: 604 kfree(scon); 605 return length; 606 } 607 608 static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 609 { 610 char *scon, *tcon; 611 u32 ssid, tsid, newsid; 612 u16 tclass; 613 ssize_t length; 614 char *newcon; 615 u32 len; 616 617 length = task_has_security(current, SECURITY__COMPUTE_CREATE); 618 if (length) 619 return length; 620 621 length = -ENOMEM; 622 scon = kzalloc(size+1, GFP_KERNEL); 623 if (!scon) 624 return length; 625 626 tcon = kzalloc(size+1, GFP_KERNEL); 627 if (!tcon) 628 goto out; 629 630 length = -EINVAL; 631 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 632 goto out2; 633 634 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 635 if (length < 0) 636 goto out2; 637 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 638 if (length < 0) 639 goto out2; 640 641 length = security_transition_sid(ssid, tsid, tclass, &newsid); 642 if (length < 0) 643 goto out2; 644 645 length = security_sid_to_context(newsid, &newcon, &len); 646 if (length < 0) 647 goto out2; 648 649 if (len > SIMPLE_TRANSACTION_LIMIT) { 650 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 651 "payload max\n", __func__, len); 652 length = -ERANGE; 653 goto out3; 654 } 655 656 memcpy(buf, newcon, len); 657 length = len; 658 out3: 659 kfree(newcon); 660 out2: 661 kfree(tcon); 662 out: 663 kfree(scon); 664 return length; 665 } 666 667 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) 668 { 669 char *scon, *tcon; 670 u32 ssid, tsid, newsid; 671 u16 tclass; 672 ssize_t length; 673 char *newcon; 674 u32 len; 675 676 length = task_has_security(current, SECURITY__COMPUTE_RELABEL); 677 if (length) 678 return length; 679 680 length = -ENOMEM; 681 scon = kzalloc(size+1, GFP_KERNEL); 682 if (!scon) 683 return length; 684 685 tcon = kzalloc(size+1, GFP_KERNEL); 686 if (!tcon) 687 goto out; 688 689 length = -EINVAL; 690 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 691 goto out2; 692 693 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 694 if (length < 0) 695 goto out2; 696 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 697 if (length < 0) 698 goto out2; 699 700 length = security_change_sid(ssid, tsid, tclass, &newsid); 701 if (length < 0) 702 goto out2; 703 704 length = security_sid_to_context(newsid, &newcon, &len); 705 if (length < 0) 706 goto out2; 707 708 if (len > SIMPLE_TRANSACTION_LIMIT) { 709 length = -ERANGE; 710 goto out3; 711 } 712 713 memcpy(buf, newcon, len); 714 length = len; 715 out3: 716 kfree(newcon); 717 out2: 718 kfree(tcon); 719 out: 720 kfree(scon); 721 return length; 722 } 723 724 static ssize_t sel_write_user(struct file *file, char *buf, size_t size) 725 { 726 char *con, *user, *ptr; 727 u32 sid, *sids; 728 ssize_t length; 729 char *newcon; 730 int i, rc; 731 u32 len, nsids; 732 733 length = task_has_security(current, SECURITY__COMPUTE_USER); 734 if (length) 735 return length; 736 737 length = -ENOMEM; 738 con = kzalloc(size+1, GFP_KERNEL); 739 if (!con) 740 return length; 741 742 user = kzalloc(size+1, GFP_KERNEL); 743 if (!user) 744 goto out; 745 746 length = -EINVAL; 747 if (sscanf(buf, "%s %s", con, user) != 2) 748 goto out2; 749 750 length = security_context_to_sid(con, strlen(con)+1, &sid); 751 if (length < 0) 752 goto out2; 753 754 length = security_get_user_sids(sid, user, &sids, &nsids); 755 if (length < 0) 756 goto out2; 757 758 length = sprintf(buf, "%u", nsids) + 1; 759 ptr = buf + length; 760 for (i = 0; i < nsids; i++) { 761 rc = security_sid_to_context(sids[i], &newcon, &len); 762 if (rc) { 763 length = rc; 764 goto out3; 765 } 766 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { 767 kfree(newcon); 768 length = -ERANGE; 769 goto out3; 770 } 771 memcpy(ptr, newcon, len); 772 kfree(newcon); 773 ptr += len; 774 length += len; 775 } 776 out3: 777 kfree(sids); 778 out2: 779 kfree(user); 780 out: 781 kfree(con); 782 return length; 783 } 784 785 static ssize_t sel_write_member(struct file *file, char *buf, size_t size) 786 { 787 char *scon, *tcon; 788 u32 ssid, tsid, newsid; 789 u16 tclass; 790 ssize_t length; 791 char *newcon; 792 u32 len; 793 794 length = task_has_security(current, SECURITY__COMPUTE_MEMBER); 795 if (length) 796 return length; 797 798 length = -ENOMEM; 799 scon = kzalloc(size+1, GFP_KERNEL); 800 if (!scon) 801 return length; 802 803 tcon = kzalloc(size+1, GFP_KERNEL); 804 if (!tcon) 805 goto out; 806 807 length = -EINVAL; 808 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 809 goto out2; 810 811 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 812 if (length < 0) 813 goto out2; 814 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 815 if (length < 0) 816 goto out2; 817 818 length = security_member_sid(ssid, tsid, tclass, &newsid); 819 if (length < 0) 820 goto out2; 821 822 length = security_sid_to_context(newsid, &newcon, &len); 823 if (length < 0) 824 goto out2; 825 826 if (len > SIMPLE_TRANSACTION_LIMIT) { 827 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 828 "payload max\n", __func__, len); 829 length = -ERANGE; 830 goto out3; 831 } 832 833 memcpy(buf, newcon, len); 834 length = len; 835 out3: 836 kfree(newcon); 837 out2: 838 kfree(tcon); 839 out: 840 kfree(scon); 841 return length; 842 } 843 844 static struct inode *sel_make_inode(struct super_block *sb, int mode) 845 { 846 struct inode *ret = new_inode(sb); 847 848 if (ret) { 849 ret->i_mode = mode; 850 ret->i_uid = ret->i_gid = 0; 851 ret->i_blocks = 0; 852 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 853 } 854 return ret; 855 } 856 857 static ssize_t sel_read_bool(struct file *filep, char __user *buf, 858 size_t count, loff_t *ppos) 859 { 860 char *page = NULL; 861 ssize_t length; 862 ssize_t ret; 863 int cur_enforcing; 864 struct inode *inode = filep->f_path.dentry->d_inode; 865 unsigned index = inode->i_ino & SEL_INO_MASK; 866 const char *name = filep->f_path.dentry->d_name.name; 867 868 mutex_lock(&sel_mutex); 869 870 if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 871 ret = -EINVAL; 872 goto out; 873 } 874 875 if (count > PAGE_SIZE) { 876 ret = -EINVAL; 877 goto out; 878 } 879 page = (char *)get_zeroed_page(GFP_KERNEL); 880 if (!page) { 881 ret = -ENOMEM; 882 goto out; 883 } 884 885 cur_enforcing = security_get_bool_value(index); 886 if (cur_enforcing < 0) { 887 ret = cur_enforcing; 888 goto out; 889 } 890 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, 891 bool_pending_values[index]); 892 ret = simple_read_from_buffer(buf, count, ppos, page, length); 893 out: 894 mutex_unlock(&sel_mutex); 895 if (page) 896 free_page((unsigned long)page); 897 return ret; 898 } 899 900 static ssize_t sel_write_bool(struct file *filep, const char __user *buf, 901 size_t count, loff_t *ppos) 902 { 903 char *page = NULL; 904 ssize_t length; 905 int new_value; 906 struct inode *inode = filep->f_path.dentry->d_inode; 907 unsigned index = inode->i_ino & SEL_INO_MASK; 908 const char *name = filep->f_path.dentry->d_name.name; 909 910 mutex_lock(&sel_mutex); 911 912 length = task_has_security(current, SECURITY__SETBOOL); 913 if (length) 914 goto out; 915 916 if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 917 length = -EINVAL; 918 goto out; 919 } 920 921 if (count >= PAGE_SIZE) { 922 length = -ENOMEM; 923 goto out; 924 } 925 926 if (*ppos != 0) { 927 /* No partial writes. */ 928 length = -EINVAL; 929 goto out; 930 } 931 page = (char *)get_zeroed_page(GFP_KERNEL); 932 if (!page) { 933 length = -ENOMEM; 934 goto out; 935 } 936 937 length = -EFAULT; 938 if (copy_from_user(page, buf, count)) 939 goto out; 940 941 length = -EINVAL; 942 if (sscanf(page, "%d", &new_value) != 1) 943 goto out; 944 945 if (new_value) 946 new_value = 1; 947 948 bool_pending_values[index] = new_value; 949 length = count; 950 951 out: 952 mutex_unlock(&sel_mutex); 953 if (page) 954 free_page((unsigned long) page); 955 return length; 956 } 957 958 static const struct file_operations sel_bool_ops = { 959 .read = sel_read_bool, 960 .write = sel_write_bool, 961 }; 962 963 static ssize_t sel_commit_bools_write(struct file *filep, 964 const char __user *buf, 965 size_t count, loff_t *ppos) 966 { 967 char *page = NULL; 968 ssize_t length; 969 int new_value; 970 971 mutex_lock(&sel_mutex); 972 973 length = task_has_security(current, SECURITY__SETBOOL); 974 if (length) 975 goto out; 976 977 if (count >= PAGE_SIZE) { 978 length = -ENOMEM; 979 goto out; 980 } 981 if (*ppos != 0) { 982 /* No partial writes. */ 983 goto out; 984 } 985 page = (char *)get_zeroed_page(GFP_KERNEL); 986 if (!page) { 987 length = -ENOMEM; 988 goto out; 989 } 990 991 length = -EFAULT; 992 if (copy_from_user(page, buf, count)) 993 goto out; 994 995 length = -EINVAL; 996 if (sscanf(page, "%d", &new_value) != 1) 997 goto out; 998 999 if (new_value && bool_pending_values) 1000 security_set_bools(bool_num, bool_pending_values); 1001 1002 length = count; 1003 1004 out: 1005 mutex_unlock(&sel_mutex); 1006 if (page) 1007 free_page((unsigned long) page); 1008 return length; 1009 } 1010 1011 static const struct file_operations sel_commit_bools_ops = { 1012 .write = sel_commit_bools_write, 1013 }; 1014 1015 static void sel_remove_entries(struct dentry *de) 1016 { 1017 struct list_head *node; 1018 1019 spin_lock(&dcache_lock); 1020 node = de->d_subdirs.next; 1021 while (node != &de->d_subdirs) { 1022 struct dentry *d = list_entry(node, struct dentry, d_u.d_child); 1023 list_del_init(node); 1024 1025 if (d->d_inode) { 1026 d = dget_locked(d); 1027 spin_unlock(&dcache_lock); 1028 d_delete(d); 1029 simple_unlink(de->d_inode, d); 1030 dput(d); 1031 spin_lock(&dcache_lock); 1032 } 1033 node = de->d_subdirs.next; 1034 } 1035 1036 spin_unlock(&dcache_lock); 1037 } 1038 1039 #define BOOL_DIR_NAME "booleans" 1040 1041 static int sel_make_bools(void) 1042 { 1043 int i, ret = 0; 1044 ssize_t len; 1045 struct dentry *dentry = NULL; 1046 struct dentry *dir = bool_dir; 1047 struct inode *inode = NULL; 1048 struct inode_security_struct *isec; 1049 char **names = NULL, *page; 1050 int num; 1051 int *values = NULL; 1052 u32 sid; 1053 1054 /* remove any existing files */ 1055 kfree(bool_pending_names); 1056 kfree(bool_pending_values); 1057 bool_pending_names = NULL; 1058 bool_pending_values = NULL; 1059 1060 sel_remove_entries(dir); 1061 1062 page = (char *)get_zeroed_page(GFP_KERNEL); 1063 if (!page) 1064 return -ENOMEM; 1065 1066 ret = security_get_bools(&num, &names, &values); 1067 if (ret != 0) 1068 goto out; 1069 1070 for (i = 0; i < num; i++) { 1071 dentry = d_alloc_name(dir, names[i]); 1072 if (!dentry) { 1073 ret = -ENOMEM; 1074 goto err; 1075 } 1076 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); 1077 if (!inode) { 1078 ret = -ENOMEM; 1079 goto err; 1080 } 1081 1082 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); 1083 if (len < 0) { 1084 ret = -EINVAL; 1085 goto err; 1086 } else if (len >= PAGE_SIZE) { 1087 ret = -ENAMETOOLONG; 1088 goto err; 1089 } 1090 isec = (struct inode_security_struct *)inode->i_security; 1091 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); 1092 if (ret) 1093 goto err; 1094 isec->sid = sid; 1095 isec->initialized = 1; 1096 inode->i_fop = &sel_bool_ops; 1097 inode->i_ino = i|SEL_BOOL_INO_OFFSET; 1098 d_add(dentry, inode); 1099 } 1100 bool_num = num; 1101 bool_pending_names = names; 1102 bool_pending_values = values; 1103 out: 1104 free_page((unsigned long)page); 1105 return ret; 1106 err: 1107 if (names) { 1108 for (i = 0; i < num; i++) 1109 kfree(names[i]); 1110 kfree(names); 1111 } 1112 kfree(values); 1113 sel_remove_entries(dir); 1114 ret = -ENOMEM; 1115 goto out; 1116 } 1117 1118 #define NULL_FILE_NAME "null" 1119 1120 struct dentry *selinux_null; 1121 1122 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, 1123 size_t count, loff_t *ppos) 1124 { 1125 char tmpbuf[TMPBUFLEN]; 1126 ssize_t length; 1127 1128 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); 1129 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 1130 } 1131 1132 static ssize_t sel_write_avc_cache_threshold(struct file *file, 1133 const char __user *buf, 1134 size_t count, loff_t *ppos) 1135 1136 { 1137 char *page; 1138 ssize_t ret; 1139 int new_value; 1140 1141 if (count >= PAGE_SIZE) { 1142 ret = -ENOMEM; 1143 goto out; 1144 } 1145 1146 if (*ppos != 0) { 1147 /* No partial writes. */ 1148 ret = -EINVAL; 1149 goto out; 1150 } 1151 1152 page = (char *)get_zeroed_page(GFP_KERNEL); 1153 if (!page) { 1154 ret = -ENOMEM; 1155 goto out; 1156 } 1157 1158 if (copy_from_user(page, buf, count)) { 1159 ret = -EFAULT; 1160 goto out_free; 1161 } 1162 1163 if (sscanf(page, "%u", &new_value) != 1) { 1164 ret = -EINVAL; 1165 goto out; 1166 } 1167 1168 if (new_value != avc_cache_threshold) { 1169 ret = task_has_security(current, SECURITY__SETSECPARAM); 1170 if (ret) 1171 goto out_free; 1172 avc_cache_threshold = new_value; 1173 } 1174 ret = count; 1175 out_free: 1176 free_page((unsigned long)page); 1177 out: 1178 return ret; 1179 } 1180 1181 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, 1182 size_t count, loff_t *ppos) 1183 { 1184 char *page; 1185 ssize_t ret = 0; 1186 1187 page = (char *)__get_free_page(GFP_KERNEL); 1188 if (!page) { 1189 ret = -ENOMEM; 1190 goto out; 1191 } 1192 ret = avc_get_hash_stats(page); 1193 if (ret >= 0) 1194 ret = simple_read_from_buffer(buf, count, ppos, page, ret); 1195 free_page((unsigned long)page); 1196 out: 1197 return ret; 1198 } 1199 1200 static const struct file_operations sel_avc_cache_threshold_ops = { 1201 .read = sel_read_avc_cache_threshold, 1202 .write = sel_write_avc_cache_threshold, 1203 }; 1204 1205 static const struct file_operations sel_avc_hash_stats_ops = { 1206 .read = sel_read_avc_hash_stats, 1207 }; 1208 1209 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 1210 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) 1211 { 1212 int cpu; 1213 1214 for (cpu = *idx; cpu < NR_CPUS; ++cpu) { 1215 if (!cpu_possible(cpu)) 1216 continue; 1217 *idx = cpu + 1; 1218 return &per_cpu(avc_cache_stats, cpu); 1219 } 1220 return NULL; 1221 } 1222 1223 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) 1224 { 1225 loff_t n = *pos - 1; 1226 1227 if (*pos == 0) 1228 return SEQ_START_TOKEN; 1229 1230 return sel_avc_get_stat_idx(&n); 1231 } 1232 1233 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1234 { 1235 return sel_avc_get_stat_idx(pos); 1236 } 1237 1238 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) 1239 { 1240 struct avc_cache_stats *st = v; 1241 1242 if (v == SEQ_START_TOKEN) 1243 seq_printf(seq, "lookups hits misses allocations reclaims " 1244 "frees\n"); 1245 else 1246 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, 1247 st->hits, st->misses, st->allocations, 1248 st->reclaims, st->frees); 1249 return 0; 1250 } 1251 1252 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) 1253 { } 1254 1255 static const struct seq_operations sel_avc_cache_stats_seq_ops = { 1256 .start = sel_avc_stats_seq_start, 1257 .next = sel_avc_stats_seq_next, 1258 .show = sel_avc_stats_seq_show, 1259 .stop = sel_avc_stats_seq_stop, 1260 }; 1261 1262 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) 1263 { 1264 return seq_open(file, &sel_avc_cache_stats_seq_ops); 1265 } 1266 1267 static const struct file_operations sel_avc_cache_stats_ops = { 1268 .open = sel_open_avc_cache_stats, 1269 .read = seq_read, 1270 .llseek = seq_lseek, 1271 .release = seq_release, 1272 }; 1273 #endif 1274 1275 static int sel_make_avc_files(struct dentry *dir) 1276 { 1277 int i, ret = 0; 1278 static struct tree_descr files[] = { 1279 { "cache_threshold", 1280 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, 1281 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, 1282 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 1283 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, 1284 #endif 1285 }; 1286 1287 for (i = 0; i < ARRAY_SIZE(files); i++) { 1288 struct inode *inode; 1289 struct dentry *dentry; 1290 1291 dentry = d_alloc_name(dir, files[i].name); 1292 if (!dentry) { 1293 ret = -ENOMEM; 1294 goto out; 1295 } 1296 1297 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); 1298 if (!inode) { 1299 ret = -ENOMEM; 1300 goto out; 1301 } 1302 inode->i_fop = files[i].ops; 1303 inode->i_ino = ++sel_last_ino; 1304 d_add(dentry, inode); 1305 } 1306 out: 1307 return ret; 1308 } 1309 1310 static ssize_t sel_read_initcon(struct file *file, char __user *buf, 1311 size_t count, loff_t *ppos) 1312 { 1313 struct inode *inode; 1314 char *con; 1315 u32 sid, len; 1316 ssize_t ret; 1317 1318 inode = file->f_path.dentry->d_inode; 1319 sid = inode->i_ino&SEL_INO_MASK; 1320 ret = security_sid_to_context(sid, &con, &len); 1321 if (ret < 0) 1322 return ret; 1323 1324 ret = simple_read_from_buffer(buf, count, ppos, con, len); 1325 kfree(con); 1326 return ret; 1327 } 1328 1329 static const struct file_operations sel_initcon_ops = { 1330 .read = sel_read_initcon, 1331 }; 1332 1333 static int sel_make_initcon_files(struct dentry *dir) 1334 { 1335 int i, ret = 0; 1336 1337 for (i = 1; i <= SECINITSID_NUM; i++) { 1338 struct inode *inode; 1339 struct dentry *dentry; 1340 dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); 1341 if (!dentry) { 1342 ret = -ENOMEM; 1343 goto out; 1344 } 1345 1346 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1347 if (!inode) { 1348 ret = -ENOMEM; 1349 goto out; 1350 } 1351 inode->i_fop = &sel_initcon_ops; 1352 inode->i_ino = i|SEL_INITCON_INO_OFFSET; 1353 d_add(dentry, inode); 1354 } 1355 out: 1356 return ret; 1357 } 1358 1359 static inline unsigned int sel_div(unsigned long a, unsigned long b) 1360 { 1361 return a / b - (a % b < 0); 1362 } 1363 1364 static inline unsigned long sel_class_to_ino(u16 class) 1365 { 1366 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; 1367 } 1368 1369 static inline u16 sel_ino_to_class(unsigned long ino) 1370 { 1371 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); 1372 } 1373 1374 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) 1375 { 1376 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; 1377 } 1378 1379 static inline u32 sel_ino_to_perm(unsigned long ino) 1380 { 1381 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); 1382 } 1383 1384 static ssize_t sel_read_class(struct file *file, char __user *buf, 1385 size_t count, loff_t *ppos) 1386 { 1387 ssize_t rc, len; 1388 char *page; 1389 unsigned long ino = file->f_path.dentry->d_inode->i_ino; 1390 1391 page = (char *)__get_free_page(GFP_KERNEL); 1392 if (!page) { 1393 rc = -ENOMEM; 1394 goto out; 1395 } 1396 1397 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); 1398 rc = simple_read_from_buffer(buf, count, ppos, page, len); 1399 free_page((unsigned long)page); 1400 out: 1401 return rc; 1402 } 1403 1404 static const struct file_operations sel_class_ops = { 1405 .read = sel_read_class, 1406 }; 1407 1408 static ssize_t sel_read_perm(struct file *file, char __user *buf, 1409 size_t count, loff_t *ppos) 1410 { 1411 ssize_t rc, len; 1412 char *page; 1413 unsigned long ino = file->f_path.dentry->d_inode->i_ino; 1414 1415 page = (char *)__get_free_page(GFP_KERNEL); 1416 if (!page) { 1417 rc = -ENOMEM; 1418 goto out; 1419 } 1420 1421 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); 1422 rc = simple_read_from_buffer(buf, count, ppos, page, len); 1423 free_page((unsigned long)page); 1424 out: 1425 return rc; 1426 } 1427 1428 static const struct file_operations sel_perm_ops = { 1429 .read = sel_read_perm, 1430 }; 1431 1432 static ssize_t sel_read_policycap(struct file *file, char __user *buf, 1433 size_t count, loff_t *ppos) 1434 { 1435 int value; 1436 char tmpbuf[TMPBUFLEN]; 1437 ssize_t length; 1438 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; 1439 1440 value = security_policycap_supported(i_ino & SEL_INO_MASK); 1441 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); 1442 1443 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 1444 } 1445 1446 static const struct file_operations sel_policycap_ops = { 1447 .read = sel_read_policycap, 1448 }; 1449 1450 static int sel_make_perm_files(char *objclass, int classvalue, 1451 struct dentry *dir) 1452 { 1453 int i, rc = 0, nperms; 1454 char **perms; 1455 1456 rc = security_get_permissions(objclass, &perms, &nperms); 1457 if (rc) 1458 goto out; 1459 1460 for (i = 0; i < nperms; i++) { 1461 struct inode *inode; 1462 struct dentry *dentry; 1463 1464 dentry = d_alloc_name(dir, perms[i]); 1465 if (!dentry) { 1466 rc = -ENOMEM; 1467 goto out1; 1468 } 1469 1470 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1471 if (!inode) { 1472 rc = -ENOMEM; 1473 goto out1; 1474 } 1475 inode->i_fop = &sel_perm_ops; 1476 /* i+1 since perm values are 1-indexed */ 1477 inode->i_ino = sel_perm_to_ino(classvalue, i+1); 1478 d_add(dentry, inode); 1479 } 1480 1481 out1: 1482 for (i = 0; i < nperms; i++) 1483 kfree(perms[i]); 1484 kfree(perms); 1485 out: 1486 return rc; 1487 } 1488 1489 static int sel_make_class_dir_entries(char *classname, int index, 1490 struct dentry *dir) 1491 { 1492 struct dentry *dentry = NULL; 1493 struct inode *inode = NULL; 1494 int rc; 1495 1496 dentry = d_alloc_name(dir, "index"); 1497 if (!dentry) { 1498 rc = -ENOMEM; 1499 goto out; 1500 } 1501 1502 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1503 if (!inode) { 1504 rc = -ENOMEM; 1505 goto out; 1506 } 1507 1508 inode->i_fop = &sel_class_ops; 1509 inode->i_ino = sel_class_to_ino(index); 1510 d_add(dentry, inode); 1511 1512 dentry = d_alloc_name(dir, "perms"); 1513 if (!dentry) { 1514 rc = -ENOMEM; 1515 goto out; 1516 } 1517 1518 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); 1519 if (rc) 1520 goto out; 1521 1522 rc = sel_make_perm_files(classname, index, dentry); 1523 1524 out: 1525 return rc; 1526 } 1527 1528 static void sel_remove_classes(void) 1529 { 1530 struct list_head *class_node; 1531 1532 list_for_each(class_node, &class_dir->d_subdirs) { 1533 struct dentry *class_subdir = list_entry(class_node, 1534 struct dentry, d_u.d_child); 1535 struct list_head *class_subdir_node; 1536 1537 list_for_each(class_subdir_node, &class_subdir->d_subdirs) { 1538 struct dentry *d = list_entry(class_subdir_node, 1539 struct dentry, d_u.d_child); 1540 1541 if (d->d_inode) 1542 if (d->d_inode->i_mode & S_IFDIR) 1543 sel_remove_entries(d); 1544 } 1545 1546 sel_remove_entries(class_subdir); 1547 } 1548 1549 sel_remove_entries(class_dir); 1550 } 1551 1552 static int sel_make_classes(void) 1553 { 1554 int rc = 0, nclasses, i; 1555 char **classes; 1556 1557 /* delete any existing entries */ 1558 sel_remove_classes(); 1559 1560 rc = security_get_classes(&classes, &nclasses); 1561 if (rc < 0) 1562 goto out; 1563 1564 /* +2 since classes are 1-indexed */ 1565 last_class_ino = sel_class_to_ino(nclasses+2); 1566 1567 for (i = 0; i < nclasses; i++) { 1568 struct dentry *class_name_dir; 1569 1570 class_name_dir = d_alloc_name(class_dir, classes[i]); 1571 if (!class_name_dir) { 1572 rc = -ENOMEM; 1573 goto out1; 1574 } 1575 1576 rc = sel_make_dir(class_dir->d_inode, class_name_dir, 1577 &last_class_ino); 1578 if (rc) 1579 goto out1; 1580 1581 /* i+1 since class values are 1-indexed */ 1582 rc = sel_make_class_dir_entries(classes[i], i+1, 1583 class_name_dir); 1584 if (rc) 1585 goto out1; 1586 } 1587 1588 out1: 1589 for (i = 0; i < nclasses; i++) 1590 kfree(classes[i]); 1591 kfree(classes); 1592 out: 1593 return rc; 1594 } 1595 1596 static int sel_make_policycap(void) 1597 { 1598 unsigned int iter; 1599 struct dentry *dentry = NULL; 1600 struct inode *inode = NULL; 1601 1602 sel_remove_entries(policycap_dir); 1603 1604 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { 1605 if (iter < ARRAY_SIZE(policycap_names)) 1606 dentry = d_alloc_name(policycap_dir, 1607 policycap_names[iter]); 1608 else 1609 dentry = d_alloc_name(policycap_dir, "unknown"); 1610 1611 if (dentry == NULL) 1612 return -ENOMEM; 1613 1614 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); 1615 if (inode == NULL) 1616 return -ENOMEM; 1617 1618 inode->i_fop = &sel_policycap_ops; 1619 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; 1620 d_add(dentry, inode); 1621 } 1622 1623 return 0; 1624 } 1625 1626 static int sel_make_dir(struct inode *dir, struct dentry *dentry, 1627 unsigned long *ino) 1628 { 1629 int ret = 0; 1630 struct inode *inode; 1631 1632 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); 1633 if (!inode) { 1634 ret = -ENOMEM; 1635 goto out; 1636 } 1637 inode->i_op = &simple_dir_inode_operations; 1638 inode->i_fop = &simple_dir_operations; 1639 inode->i_ino = ++(*ino); 1640 /* directory inodes start off with i_nlink == 2 (for "." entry) */ 1641 inc_nlink(inode); 1642 d_add(dentry, inode); 1643 /* bump link count on parent directory, too */ 1644 inc_nlink(dir); 1645 out: 1646 return ret; 1647 } 1648 1649 static int sel_fill_super(struct super_block *sb, void *data, int silent) 1650 { 1651 int ret; 1652 struct dentry *dentry; 1653 struct inode *inode, *root_inode; 1654 struct inode_security_struct *isec; 1655 1656 static struct tree_descr selinux_files[] = { 1657 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, 1658 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, 1659 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, 1660 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, 1661 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, 1662 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, 1663 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, 1664 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, 1665 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, 1666 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, 1667 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, 1668 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, 1669 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, 1670 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR}, 1671 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, 1672 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, 1673 /* last one */ {""} 1674 }; 1675 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); 1676 if (ret) 1677 goto err; 1678 1679 root_inode = sb->s_root->d_inode; 1680 1681 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); 1682 if (!dentry) { 1683 ret = -ENOMEM; 1684 goto err; 1685 } 1686 1687 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1688 if (ret) 1689 goto err; 1690 1691 bool_dir = dentry; 1692 1693 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); 1694 if (!dentry) { 1695 ret = -ENOMEM; 1696 goto err; 1697 } 1698 1699 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); 1700 if (!inode) { 1701 ret = -ENOMEM; 1702 goto err; 1703 } 1704 inode->i_ino = ++sel_last_ino; 1705 isec = (struct inode_security_struct *)inode->i_security; 1706 isec->sid = SECINITSID_DEVNULL; 1707 isec->sclass = SECCLASS_CHR_FILE; 1708 isec->initialized = 1; 1709 1710 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); 1711 d_add(dentry, inode); 1712 selinux_null = dentry; 1713 1714 dentry = d_alloc_name(sb->s_root, "avc"); 1715 if (!dentry) { 1716 ret = -ENOMEM; 1717 goto err; 1718 } 1719 1720 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1721 if (ret) 1722 goto err; 1723 1724 ret = sel_make_avc_files(dentry); 1725 if (ret) 1726 goto err; 1727 1728 dentry = d_alloc_name(sb->s_root, "initial_contexts"); 1729 if (!dentry) { 1730 ret = -ENOMEM; 1731 goto err; 1732 } 1733 1734 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1735 if (ret) 1736 goto err; 1737 1738 ret = sel_make_initcon_files(dentry); 1739 if (ret) 1740 goto err; 1741 1742 dentry = d_alloc_name(sb->s_root, "class"); 1743 if (!dentry) { 1744 ret = -ENOMEM; 1745 goto err; 1746 } 1747 1748 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1749 if (ret) 1750 goto err; 1751 1752 class_dir = dentry; 1753 1754 dentry = d_alloc_name(sb->s_root, "policy_capabilities"); 1755 if (!dentry) { 1756 ret = -ENOMEM; 1757 goto err; 1758 } 1759 1760 ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1761 if (ret) 1762 goto err; 1763 1764 policycap_dir = dentry; 1765 1766 out: 1767 return ret; 1768 err: 1769 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", 1770 __func__); 1771 goto out; 1772 } 1773 1774 static int sel_get_sb(struct file_system_type *fs_type, 1775 int flags, const char *dev_name, void *data, 1776 struct vfsmount *mnt) 1777 { 1778 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); 1779 } 1780 1781 static struct file_system_type sel_fs_type = { 1782 .name = "selinuxfs", 1783 .get_sb = sel_get_sb, 1784 .kill_sb = kill_litter_super, 1785 }; 1786 1787 struct vfsmount *selinuxfs_mount; 1788 1789 static int __init init_sel_fs(void) 1790 { 1791 int err; 1792 1793 if (!selinux_enabled) 1794 return 0; 1795 err = register_filesystem(&sel_fs_type); 1796 if (!err) { 1797 selinuxfs_mount = kern_mount(&sel_fs_type); 1798 if (IS_ERR(selinuxfs_mount)) { 1799 printk(KERN_ERR "selinuxfs: could not mount!\n"); 1800 err = PTR_ERR(selinuxfs_mount); 1801 selinuxfs_mount = NULL; 1802 } 1803 } 1804 return err; 1805 } 1806 1807 __initcall(init_sel_fs); 1808 1809 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 1810 void exit_sel_fs(void) 1811 { 1812 unregister_filesystem(&sel_fs_type); 1813 } 1814 #endif 1815