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