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