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 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT 51 #define SELINUX_COMPAT_NET_VALUE 0 52 #else 53 #define SELINUX_COMPAT_NET_VALUE 1 54 #endif 55 56 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE; 57 58 static int __init checkreqprot_setup(char *str) 59 { 60 unsigned long checkreqprot; 61 if (!strict_strtoul(str, 0, &checkreqprot)) 62 selinux_checkreqprot = checkreqprot ? 1 : 0; 63 return 1; 64 } 65 __setup("checkreqprot=", checkreqprot_setup); 66 67 static int __init selinux_compat_net_setup(char *str) 68 { 69 unsigned long compat_net; 70 if (!strict_strtoul(str, 0, &compat_net)) 71 selinux_compat_net = compat_net ? 1 : 0; 72 return 1; 73 } 74 __setup("selinux_compat_net=", selinux_compat_net_setup); 75 76 77 static DEFINE_MUTEX(sel_mutex); 78 79 /* global data for booleans */ 80 static struct dentry *bool_dir; 81 static int bool_num; 82 static char **bool_pending_names; 83 static int *bool_pending_values; 84 85 /* global data for classes */ 86 static struct dentry *class_dir; 87 static unsigned long last_class_ino; 88 89 /* global data for policy capabilities */ 90 static struct dentry *policycap_dir; 91 92 extern void selnl_notify_setenforce(int val); 93 94 /* Check whether a task is allowed to use a security operation. */ 95 static int task_has_security(struct task_struct *tsk, 96 u32 perms) 97 { 98 struct task_security_struct *tsec; 99 100 tsec = tsk->security; 101 if (!tsec) 102 return -EACCES; 103 104 return avc_has_perm(tsec->sid, SECINITSID_SECURITY, 105 SECCLASS_SECURITY, perms, NULL); 106 } 107 108 enum sel_inos { 109 SEL_ROOT_INO = 2, 110 SEL_LOAD, /* load policy */ 111 SEL_ENFORCE, /* get or set enforcing status */ 112 SEL_CONTEXT, /* validate context */ 113 SEL_ACCESS, /* compute access decision */ 114 SEL_CREATE, /* compute create labeling decision */ 115 SEL_RELABEL, /* compute relabeling decision */ 116 SEL_USER, /* compute reachable user contexts */ 117 SEL_POLICYVERS, /* return policy version for this kernel */ 118 SEL_COMMIT_BOOLS, /* commit new boolean values */ 119 SEL_MLS, /* return if MLS policy is enabled */ 120 SEL_DISABLE, /* disable SELinux until next reboot */ 121 SEL_MEMBER, /* compute polyinstantiation membership decision */ 122 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ 123 SEL_COMPAT_NET, /* whether to use old compat network packet controls */ 124 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ 125 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ 126 SEL_INO_NEXT, /* The next inode number to use */ 127 }; 128 129 static unsigned long sel_last_ino = SEL_INO_NEXT - 1; 130 131 #define SEL_INITCON_INO_OFFSET 0x01000000 132 #define SEL_BOOL_INO_OFFSET 0x02000000 133 #define SEL_CLASS_INO_OFFSET 0x04000000 134 #define SEL_POLICYCAP_INO_OFFSET 0x08000000 135 #define SEL_INO_MASK 0x00ffffff 136 137 #define TMPBUFLEN 12 138 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, 139 size_t count, loff_t *ppos) 140 { 141 char tmpbuf[TMPBUFLEN]; 142 ssize_t length; 143 144 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); 145 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 146 } 147 148 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 149 static ssize_t sel_write_enforce(struct file *file, const char __user *buf, 150 size_t count, loff_t *ppos) 151 152 { 153 char *page; 154 ssize_t length; 155 int new_value; 156 157 if (count >= PAGE_SIZE) 158 return -ENOMEM; 159 if (*ppos != 0) { 160 /* No partial writes. */ 161 return -EINVAL; 162 } 163 page = (char *)get_zeroed_page(GFP_KERNEL); 164 if (!page) 165 return -ENOMEM; 166 length = -EFAULT; 167 if (copy_from_user(page, buf, count)) 168 goto out; 169 170 length = -EINVAL; 171 if (sscanf(page, "%d", &new_value) != 1) 172 goto out; 173 174 if (new_value != selinux_enforcing) { 175 length = task_has_security(current, SECURITY__SETENFORCE); 176 if (length) 177 goto out; 178 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 179 "enforcing=%d old_enforcing=%d auid=%u ses=%u", 180 new_value, selinux_enforcing, 181 audit_get_loginuid(current), 182 audit_get_sessionid(current)); 183 selinux_enforcing = new_value; 184 if (selinux_enforcing) 185 avc_ss_reset(0); 186 selnl_notify_setenforce(selinux_enforcing); 187 } 188 length = count; 189 out: 190 free_page((unsigned long) page); 191 return length; 192 } 193 #else 194 #define sel_write_enforce NULL 195 #endif 196 197 static const struct file_operations sel_enforce_ops = { 198 .read = sel_read_enforce, 199 .write = sel_write_enforce, 200 }; 201 202 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, 203 size_t count, loff_t *ppos) 204 { 205 char tmpbuf[TMPBUFLEN]; 206 ssize_t length; 207 ino_t ino = filp->f_path.dentry->d_inode->i_ino; 208 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? 209 security_get_reject_unknown() : !security_get_allow_unknown(); 210 211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); 212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 213 } 214 215 static const struct file_operations sel_handle_unknown_ops = { 216 .read = sel_read_handle_unknown, 217 }; 218 219 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 220 static ssize_t sel_write_disable(struct file *file, const char __user *buf, 221 size_t count, loff_t *ppos) 222 223 { 224 char *page; 225 ssize_t length; 226 int new_value; 227 extern int selinux_disable(void); 228 229 if (count >= PAGE_SIZE) 230 return -ENOMEM; 231 if (*ppos != 0) { 232 /* No partial writes. */ 233 return -EINVAL; 234 } 235 page = (char *)get_zeroed_page(GFP_KERNEL); 236 if (!page) 237 return -ENOMEM; 238 length = -EFAULT; 239 if (copy_from_user(page, buf, count)) 240 goto out; 241 242 length = -EINVAL; 243 if (sscanf(page, "%d", &new_value) != 1) 244 goto out; 245 246 if (new_value) { 247 length = selinux_disable(); 248 if (length < 0) 249 goto out; 250 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 251 "selinux=0 auid=%u ses=%u", 252 audit_get_loginuid(current), 253 audit_get_sessionid(current)); 254 } 255 256 length = count; 257 out: 258 free_page((unsigned long) page); 259 return length; 260 } 261 #else 262 #define sel_write_disable NULL 263 #endif 264 265 static const struct file_operations sel_disable_ops = { 266 .write = sel_write_disable, 267 }; 268 269 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, 270 size_t count, loff_t *ppos) 271 { 272 char tmpbuf[TMPBUFLEN]; 273 ssize_t length; 274 275 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); 276 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 277 } 278 279 static const struct file_operations sel_policyvers_ops = { 280 .read = sel_read_policyvers, 281 }; 282 283 /* declaration for sel_write_load */ 284 static int sel_make_bools(void); 285 static int sel_make_classes(void); 286 static int sel_make_policycap(void); 287 288 /* declaration for sel_make_class_dirs */ 289 static int sel_make_dir(struct inode *dir, struct dentry *dentry, 290 unsigned long *ino); 291 292 static ssize_t sel_read_mls(struct file *filp, char __user *buf, 293 size_t count, loff_t *ppos) 294 { 295 char tmpbuf[TMPBUFLEN]; 296 ssize_t length; 297 298 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); 299 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 300 } 301 302 static const struct file_operations sel_mls_ops = { 303 .read = sel_read_mls, 304 }; 305 306 static ssize_t sel_write_load(struct file *file, const char __user *buf, 307 size_t count, loff_t *ppos) 308 309 { 310 int ret; 311 ssize_t length; 312 void *data = NULL; 313 314 mutex_lock(&sel_mutex); 315 316 length = task_has_security(current, SECURITY__LOAD_POLICY); 317 if (length) 318 goto out; 319 320 if (*ppos != 0) { 321 /* No partial writes. */ 322 length = -EINVAL; 323 goto out; 324 } 325 326 if ((count > 64 * 1024 * 1024) 327 || (data = vmalloc(count)) == NULL) { 328 length = -ENOMEM; 329 goto out; 330 } 331 332 length = -EFAULT; 333 if (copy_from_user(data, buf, count) != 0) 334 goto out; 335 336 length = security_load_policy(data, count); 337 if (length) 338 goto out; 339 340 ret = sel_make_bools(); 341 if (ret) { 342 length = ret; 343 goto out1; 344 } 345 346 ret = sel_make_classes(); 347 if (ret) { 348 length = ret; 349 goto out1; 350 } 351 352 ret = sel_make_policycap(); 353 if (ret) 354 length = ret; 355 else 356 length = count; 357 358 out1: 359 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, 360 "policy loaded auid=%u ses=%u", 361 audit_get_loginuid(current), 362 audit_get_sessionid(current)); 363 out: 364 mutex_unlock(&sel_mutex); 365 vfree(data); 366 return length; 367 } 368 369 static const struct file_operations sel_load_ops = { 370 .write = sel_write_load, 371 }; 372 373 static ssize_t sel_write_context(struct file *file, char *buf, size_t size) 374 { 375 char *canon; 376 u32 sid, len; 377 ssize_t length; 378 379 length = task_has_security(current, SECURITY__CHECK_CONTEXT); 380 if (length) 381 return length; 382 383 length = security_context_to_sid(buf, size, &sid); 384 if (length < 0) 385 return length; 386 387 length = security_sid_to_context(sid, &canon, &len); 388 if (length < 0) 389 return length; 390 391 if (len > SIMPLE_TRANSACTION_LIMIT) { 392 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 393 "payload max\n", __func__, len); 394 length = -ERANGE; 395 goto out; 396 } 397 398 memcpy(buf, canon, len); 399 length = len; 400 out: 401 kfree(canon); 402 return length; 403 } 404 405 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, 406 size_t count, loff_t *ppos) 407 { 408 char tmpbuf[TMPBUFLEN]; 409 ssize_t length; 410 411 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); 412 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 413 } 414 415 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, 416 size_t count, loff_t *ppos) 417 { 418 char *page; 419 ssize_t length; 420 unsigned int new_value; 421 422 length = task_has_security(current, SECURITY__SETCHECKREQPROT); 423 if (length) 424 return length; 425 426 if (count >= PAGE_SIZE) 427 return -ENOMEM; 428 if (*ppos != 0) { 429 /* No partial writes. */ 430 return -EINVAL; 431 } 432 page = (char *)get_zeroed_page(GFP_KERNEL); 433 if (!page) 434 return -ENOMEM; 435 length = -EFAULT; 436 if (copy_from_user(page, buf, count)) 437 goto out; 438 439 length = -EINVAL; 440 if (sscanf(page, "%u", &new_value) != 1) 441 goto out; 442 443 selinux_checkreqprot = new_value ? 1 : 0; 444 length = count; 445 out: 446 free_page((unsigned long) page); 447 return length; 448 } 449 static const struct file_operations sel_checkreqprot_ops = { 450 .read = sel_read_checkreqprot, 451 .write = sel_write_checkreqprot, 452 }; 453 454 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf, 455 size_t count, loff_t *ppos) 456 { 457 char tmpbuf[TMPBUFLEN]; 458 ssize_t length; 459 460 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net); 461 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 462 } 463 464 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf, 465 size_t count, loff_t *ppos) 466 { 467 char *page; 468 ssize_t length; 469 int new_value; 470 471 length = task_has_security(current, SECURITY__LOAD_POLICY); 472 if (length) 473 return length; 474 475 if (count >= PAGE_SIZE) 476 return -ENOMEM; 477 if (*ppos != 0) { 478 /* No partial writes. */ 479 return -EINVAL; 480 } 481 page = (char *)get_zeroed_page(GFP_KERNEL); 482 if (!page) 483 return -ENOMEM; 484 length = -EFAULT; 485 if (copy_from_user(page, buf, count)) 486 goto out; 487 488 length = -EINVAL; 489 if (sscanf(page, "%d", &new_value) != 1) 490 goto out; 491 492 selinux_compat_net = new_value ? 1 : 0; 493 length = count; 494 out: 495 free_page((unsigned long) page); 496 return length; 497 } 498 static const struct file_operations sel_compat_net_ops = { 499 .read = sel_read_compat_net, 500 .write = sel_write_compat_net, 501 }; 502 503 /* 504 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c 505 */ 506 static ssize_t sel_write_access(struct file *file, char *buf, size_t size); 507 static ssize_t sel_write_create(struct file *file, char *buf, size_t size); 508 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); 509 static ssize_t sel_write_user(struct file *file, char *buf, size_t size); 510 static ssize_t sel_write_member(struct file *file, char *buf, size_t size); 511 512 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 513 [SEL_ACCESS] = sel_write_access, 514 [SEL_CREATE] = sel_write_create, 515 [SEL_RELABEL] = sel_write_relabel, 516 [SEL_USER] = sel_write_user, 517 [SEL_MEMBER] = sel_write_member, 518 [SEL_CONTEXT] = sel_write_context, 519 }; 520 521 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 522 { 523 ino_t ino = file->f_path.dentry->d_inode->i_ino; 524 char *data; 525 ssize_t rv; 526 527 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 528 return -EINVAL; 529 530 data = simple_transaction_get(file, buf, size); 531 if (IS_ERR(data)) 532 return PTR_ERR(data); 533 534 rv = write_op[ino](file, data, size); 535 if (rv > 0) { 536 simple_transaction_set(file, rv); 537 rv = size; 538 } 539 return rv; 540 } 541 542 static const struct file_operations transaction_ops = { 543 .write = selinux_transaction_write, 544 .read = simple_transaction_read, 545 .release = simple_transaction_release, 546 }; 547 548 /* 549 * payload - write methods 550 * If the method has a response, the response should be put in buf, 551 * and the length returned. Otherwise return 0 or and -error. 552 */ 553 554 static ssize_t sel_write_access(struct file *file, char *buf, size_t size) 555 { 556 char *scon, *tcon; 557 u32 ssid, tsid; 558 u16 tclass; 559 u32 req; 560 struct av_decision avd; 561 ssize_t length; 562 563 length = task_has_security(current, SECURITY__COMPUTE_AV); 564 if (length) 565 return length; 566 567 length = -ENOMEM; 568 scon = kzalloc(size+1, GFP_KERNEL); 569 if (!scon) 570 return length; 571 572 tcon = kzalloc(size+1, GFP_KERNEL); 573 if (!tcon) 574 goto out; 575 576 length = -EINVAL; 577 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) 578 goto out2; 579 580 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 581 if (length < 0) 582 goto out2; 583 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 584 if (length < 0) 585 goto out2; 586 587 length = security_compute_av(ssid, tsid, tclass, req, &avd); 588 if (length < 0) 589 goto out2; 590 591 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, 592 "%x %x %x %x %u", 593 avd.allowed, avd.decided, 594 avd.auditallow, avd.auditdeny, 595 avd.seqno); 596 out2: 597 kfree(tcon); 598 out: 599 kfree(scon); 600 return length; 601 } 602 603 static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 604 { 605 char *scon, *tcon; 606 u32 ssid, tsid, newsid; 607 u16 tclass; 608 ssize_t length; 609 char *newcon; 610 u32 len; 611 612 length = task_has_security(current, SECURITY__COMPUTE_CREATE); 613 if (length) 614 return length; 615 616 length = -ENOMEM; 617 scon = kzalloc(size+1, GFP_KERNEL); 618 if (!scon) 619 return length; 620 621 tcon = kzalloc(size+1, GFP_KERNEL); 622 if (!tcon) 623 goto out; 624 625 length = -EINVAL; 626 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 627 goto out2; 628 629 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 630 if (length < 0) 631 goto out2; 632 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 633 if (length < 0) 634 goto out2; 635 636 length = security_transition_sid(ssid, tsid, tclass, &newsid); 637 if (length < 0) 638 goto out2; 639 640 length = security_sid_to_context(newsid, &newcon, &len); 641 if (length < 0) 642 goto out2; 643 644 if (len > SIMPLE_TRANSACTION_LIMIT) { 645 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 646 "payload max\n", __func__, len); 647 length = -ERANGE; 648 goto out3; 649 } 650 651 memcpy(buf, newcon, len); 652 length = len; 653 out3: 654 kfree(newcon); 655 out2: 656 kfree(tcon); 657 out: 658 kfree(scon); 659 return length; 660 } 661 662 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) 663 { 664 char *scon, *tcon; 665 u32 ssid, tsid, newsid; 666 u16 tclass; 667 ssize_t length; 668 char *newcon; 669 u32 len; 670 671 length = task_has_security(current, SECURITY__COMPUTE_RELABEL); 672 if (length) 673 return length; 674 675 length = -ENOMEM; 676 scon = kzalloc(size+1, GFP_KERNEL); 677 if (!scon) 678 return length; 679 680 tcon = kzalloc(size+1, GFP_KERNEL); 681 if (!tcon) 682 goto out; 683 684 length = -EINVAL; 685 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 686 goto out2; 687 688 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 689 if (length < 0) 690 goto out2; 691 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 692 if (length < 0) 693 goto out2; 694 695 length = security_change_sid(ssid, tsid, tclass, &newsid); 696 if (length < 0) 697 goto out2; 698 699 length = security_sid_to_context(newsid, &newcon, &len); 700 if (length < 0) 701 goto out2; 702 703 if (len > SIMPLE_TRANSACTION_LIMIT) { 704 length = -ERANGE; 705 goto out3; 706 } 707 708 memcpy(buf, newcon, len); 709 length = len; 710 out3: 711 kfree(newcon); 712 out2: 713 kfree(tcon); 714 out: 715 kfree(scon); 716 return length; 717 } 718 719 static ssize_t sel_write_user(struct file *file, char *buf, size_t size) 720 { 721 char *con, *user, *ptr; 722 u32 sid, *sids; 723 ssize_t length; 724 char *newcon; 725 int i, rc; 726 u32 len, nsids; 727 728 length = task_has_security(current, SECURITY__COMPUTE_USER); 729 if (length) 730 return length; 731 732 length = -ENOMEM; 733 con = kzalloc(size+1, GFP_KERNEL); 734 if (!con) 735 return length; 736 737 user = kzalloc(size+1, GFP_KERNEL); 738 if (!user) 739 goto out; 740 741 length = -EINVAL; 742 if (sscanf(buf, "%s %s", con, user) != 2) 743 goto out2; 744 745 length = security_context_to_sid(con, strlen(con)+1, &sid); 746 if (length < 0) 747 goto out2; 748 749 length = security_get_user_sids(sid, user, &sids, &nsids); 750 if (length < 0) 751 goto out2; 752 753 length = sprintf(buf, "%u", nsids) + 1; 754 ptr = buf + length; 755 for (i = 0; i < nsids; i++) { 756 rc = security_sid_to_context(sids[i], &newcon, &len); 757 if (rc) { 758 length = rc; 759 goto out3; 760 } 761 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { 762 kfree(newcon); 763 length = -ERANGE; 764 goto out3; 765 } 766 memcpy(ptr, newcon, len); 767 kfree(newcon); 768 ptr += len; 769 length += len; 770 } 771 out3: 772 kfree(sids); 773 out2: 774 kfree(user); 775 out: 776 kfree(con); 777 return length; 778 } 779 780 static ssize_t sel_write_member(struct file *file, char *buf, size_t size) 781 { 782 char *scon, *tcon; 783 u32 ssid, tsid, newsid; 784 u16 tclass; 785 ssize_t length; 786 char *newcon; 787 u32 len; 788 789 length = task_has_security(current, SECURITY__COMPUTE_MEMBER); 790 if (length) 791 return length; 792 793 length = -ENOMEM; 794 scon = kzalloc(size+1, GFP_KERNEL); 795 if (!scon) 796 return length; 797 798 tcon = kzalloc(size+1, GFP_KERNEL); 799 if (!tcon) 800 goto out; 801 802 length = -EINVAL; 803 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 804 goto out2; 805 806 length = security_context_to_sid(scon, strlen(scon)+1, &ssid); 807 if (length < 0) 808 goto out2; 809 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); 810 if (length < 0) 811 goto out2; 812 813 length = security_member_sid(ssid, tsid, tclass, &newsid); 814 if (length < 0) 815 goto out2; 816 817 length = security_sid_to_context(newsid, &newcon, &len); 818 if (length < 0) 819 goto out2; 820 821 if (len > SIMPLE_TRANSACTION_LIMIT) { 822 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 823 "payload max\n", __func__, len); 824 length = -ERANGE; 825 goto out3; 826 } 827 828 memcpy(buf, newcon, len); 829 length = len; 830 out3: 831 kfree(newcon); 832 out2: 833 kfree(tcon); 834 out: 835 kfree(scon); 836 return length; 837 } 838 839 static struct inode *sel_make_inode(struct super_block *sb, int mode) 840 { 841 struct inode *ret = new_inode(sb); 842 843 if (ret) { 844 ret->i_mode = mode; 845 ret->i_uid = ret->i_gid = 0; 846 ret->i_blocks = 0; 847 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 848 } 849 return ret; 850 } 851 852 static ssize_t sel_read_bool(struct file *filep, char __user *buf, 853 size_t count, loff_t *ppos) 854 { 855 char *page = NULL; 856 ssize_t length; 857 ssize_t ret; 858 int cur_enforcing; 859 struct inode *inode = filep->f_path.dentry->d_inode; 860 unsigned index = inode->i_ino & SEL_INO_MASK; 861 const char *name = filep->f_path.dentry->d_name.name; 862 863 mutex_lock(&sel_mutex); 864 865 if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 866 ret = -EINVAL; 867 goto out; 868 } 869 870 if (count > PAGE_SIZE) { 871 ret = -EINVAL; 872 goto out; 873 } 874 page = (char *)get_zeroed_page(GFP_KERNEL); 875 if (!page) { 876 ret = -ENOMEM; 877 goto out; 878 } 879 880 cur_enforcing = security_get_bool_value(index); 881 if (cur_enforcing < 0) { 882 ret = cur_enforcing; 883 goto out; 884 } 885 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, 886 bool_pending_values[index]); 887 ret = simple_read_from_buffer(buf, count, ppos, page, length); 888 out: 889 mutex_unlock(&sel_mutex); 890 if (page) 891 free_page((unsigned long)page); 892 return ret; 893 } 894 895 static ssize_t sel_write_bool(struct file *filep, const char __user *buf, 896 size_t count, loff_t *ppos) 897 { 898 char *page = NULL; 899 ssize_t length; 900 int new_value; 901 struct inode *inode = filep->f_path.dentry->d_inode; 902 unsigned index = inode->i_ino & SEL_INO_MASK; 903 const char *name = filep->f_path.dentry->d_name.name; 904 905 mutex_lock(&sel_mutex); 906 907 length = task_has_security(current, SECURITY__SETBOOL); 908 if (length) 909 goto out; 910 911 if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 912 length = -EINVAL; 913 goto out; 914 } 915 916 if (count >= PAGE_SIZE) { 917 length = -ENOMEM; 918 goto out; 919 } 920 921 if (*ppos != 0) { 922 /* No partial writes. */ 923 length = -EINVAL; 924 goto out; 925 } 926 page = (char *)get_zeroed_page(GFP_KERNEL); 927 if (!page) { 928 length = -ENOMEM; 929 goto out; 930 } 931 932 length = -EFAULT; 933 if (copy_from_user(page, buf, count)) 934 goto out; 935 936 length = -EINVAL; 937 if (sscanf(page, "%d", &new_value) != 1) 938 goto out; 939 940 if (new_value) 941 new_value = 1; 942 943 bool_pending_values[index] = new_value; 944 length = count; 945 946 out: 947 mutex_unlock(&sel_mutex); 948 if (page) 949 free_page((unsigned long) page); 950 return length; 951 } 952 953 static const struct file_operations sel_bool_ops = { 954 .read = sel_read_bool, 955 .write = sel_write_bool, 956 }; 957 958 static ssize_t sel_commit_bools_write(struct file *filep, 959 const char __user *buf, 960 size_t count, loff_t *ppos) 961 { 962 char *page = NULL; 963 ssize_t length; 964 int new_value; 965 966 mutex_lock(&sel_mutex); 967 968 length = task_has_security(current, SECURITY__SETBOOL); 969 if (length) 970 goto out; 971 972 if (count >= PAGE_SIZE) { 973 length = -ENOMEM; 974 goto out; 975 } 976 if (*ppos != 0) { 977 /* No partial writes. */ 978 goto out; 979 } 980 page = (char *)get_zeroed_page(GFP_KERNEL); 981 if (!page) { 982 length = -ENOMEM; 983 goto out; 984 } 985 986 length = -EFAULT; 987 if (copy_from_user(page, buf, count)) 988 goto out; 989 990 length = -EINVAL; 991 if (sscanf(page, "%d", &new_value) != 1) 992 goto out; 993 994 if (new_value && bool_pending_values) 995 security_set_bools(bool_num, bool_pending_values); 996 997 length = count; 998 999 out: 1000 mutex_unlock(&sel_mutex); 1001 if (page) 1002 free_page((unsigned long) page); 1003 return length; 1004 } 1005 1006 static const struct file_operations sel_commit_bools_ops = { 1007 .write = sel_commit_bools_write, 1008 }; 1009 1010 static void sel_remove_entries(struct dentry *de) 1011 { 1012 struct list_head *node; 1013 1014 spin_lock(&dcache_lock); 1015 node = de->d_subdirs.next; 1016 while (node != &de->d_subdirs) { 1017 struct dentry *d = list_entry(node, struct dentry, d_u.d_child); 1018 list_del_init(node); 1019 1020 if (d->d_inode) { 1021 d = dget_locked(d); 1022 spin_unlock(&dcache_lock); 1023 d_delete(d); 1024 simple_unlink(de->d_inode, d); 1025 dput(d); 1026 spin_lock(&dcache_lock); 1027 } 1028 node = de->d_subdirs.next; 1029 } 1030 1031 spin_unlock(&dcache_lock); 1032 } 1033 1034 #define BOOL_DIR_NAME "booleans" 1035 1036 static int sel_make_bools(void) 1037 { 1038 int i, ret = 0; 1039 ssize_t len; 1040 struct dentry *dentry = NULL; 1041 struct dentry *dir = bool_dir; 1042 struct inode *inode = NULL; 1043 struct inode_security_struct *isec; 1044 char **names = NULL, *page; 1045 int num; 1046 int *values = NULL; 1047 u32 sid; 1048 1049 /* remove any existing files */ 1050 kfree(bool_pending_names); 1051 kfree(bool_pending_values); 1052 bool_pending_names = NULL; 1053 bool_pending_values = NULL; 1054 1055 sel_remove_entries(dir); 1056 1057 page = (char *)get_zeroed_page(GFP_KERNEL); 1058 if (!page) 1059 return -ENOMEM; 1060 1061 ret = security_get_bools(&num, &names, &values); 1062 if (ret != 0) 1063 goto out; 1064 1065 for (i = 0; i < num; i++) { 1066 dentry = d_alloc_name(dir, names[i]); 1067 if (!dentry) { 1068 ret = -ENOMEM; 1069 goto err; 1070 } 1071 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); 1072 if (!inode) { 1073 ret = -ENOMEM; 1074 goto err; 1075 } 1076 1077 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); 1078 if (len < 0) { 1079 ret = -EINVAL; 1080 goto err; 1081 } else if (len >= PAGE_SIZE) { 1082 ret = -ENAMETOOLONG; 1083 goto err; 1084 } 1085 isec = (struct inode_security_struct *)inode->i_security; 1086 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); 1087 if (ret) 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; 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 "SELinux: %s: failed while creating inodes\n", 1765 __func__); 1766 goto out; 1767 } 1768 1769 static int sel_get_sb(struct file_system_type *fs_type, 1770 int flags, const char *dev_name, void *data, 1771 struct vfsmount *mnt) 1772 { 1773 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); 1774 } 1775 1776 static struct file_system_type sel_fs_type = { 1777 .name = "selinuxfs", 1778 .get_sb = sel_get_sb, 1779 .kill_sb = kill_litter_super, 1780 }; 1781 1782 struct vfsmount *selinuxfs_mount; 1783 1784 static int __init init_sel_fs(void) 1785 { 1786 int err; 1787 1788 if (!selinux_enabled) 1789 return 0; 1790 err = register_filesystem(&sel_fs_type); 1791 if (!err) { 1792 selinuxfs_mount = kern_mount(&sel_fs_type); 1793 if (IS_ERR(selinuxfs_mount)) { 1794 printk(KERN_ERR "selinuxfs: could not mount!\n"); 1795 err = PTR_ERR(selinuxfs_mount); 1796 selinuxfs_mount = NULL; 1797 } 1798 } 1799 return err; 1800 } 1801 1802 __initcall(init_sel_fs); 1803 1804 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 1805 void exit_sel_fs(void) 1806 { 1807 unregister_filesystem(&sel_fs_type); 1808 } 1809 #endif 1810