1 /*- 2 * Copyright (c) 1997-2000 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_ddb.h" 31 #include "opt_kld.h" 32 #include "opt_hwpmc_hooks.h" 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/sysproto.h> 39 #include <sys/sysent.h> 40 #include <sys/priv.h> 41 #include <sys/proc.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/sx.h> 45 #include <sys/module.h> 46 #include <sys/mount.h> 47 #include <sys/linker.h> 48 #include <sys/eventhandler.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/libkern.h> 52 #include <sys/namei.h> 53 #include <sys/vnode.h> 54 #include <sys/syscallsubr.h> 55 #include <sys/sysctl.h> 56 57 #include <net/vnet.h> 58 59 #include <security/mac/mac_framework.h> 60 61 #include "linker_if.h" 62 63 #ifdef HWPMC_HOOKS 64 #include <sys/pmckern.h> 65 #endif 66 67 #ifdef KLD_DEBUG 68 int kld_debug = 0; 69 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RW | CTLFLAG_TUN, 70 &kld_debug, 0, "Set various levels of KLD debug"); 71 TUNABLE_INT("debug.kld_debug", &kld_debug); 72 #endif 73 74 #define KLD_LOCK() sx_xlock(&kld_sx) 75 #define KLD_UNLOCK() sx_xunlock(&kld_sx) 76 #define KLD_DOWNGRADE() sx_downgrade(&kld_sx) 77 #define KLD_LOCK_READ() sx_slock(&kld_sx) 78 #define KLD_UNLOCK_READ() sx_sunlock(&kld_sx) 79 #define KLD_LOCKED() sx_xlocked(&kld_sx) 80 #define KLD_LOCK_ASSERT() do { \ 81 if (!cold) \ 82 sx_assert(&kld_sx, SX_XLOCKED); \ 83 } while (0) 84 85 /* 86 * static char *linker_search_path(const char *name, struct mod_depend 87 * *verinfo); 88 */ 89 static const char *linker_basename(const char *path); 90 91 /* 92 * Find a currently loaded file given its filename. 93 */ 94 static linker_file_t linker_find_file_by_name(const char* _filename); 95 96 /* 97 * Find a currently loaded file given its file id. 98 */ 99 static linker_file_t linker_find_file_by_id(int _fileid); 100 101 /* Metadata from the static kernel */ 102 SET_DECLARE(modmetadata_set, struct mod_metadata); 103 104 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 105 106 linker_file_t linker_kernel_file; 107 108 static struct sx kld_sx; /* kernel linker lock */ 109 110 /* 111 * Load counter used by clients to determine if a linker file has been 112 * re-loaded. This counter is incremented for each file load. 113 */ 114 static int loadcnt; 115 116 static linker_class_list_t classes; 117 static linker_file_list_t linker_files; 118 static int next_file_id = 1; 119 static int linker_no_more_classes = 0; 120 121 #define LINKER_GET_NEXT_FILE_ID(a) do { \ 122 linker_file_t lftmp; \ 123 \ 124 KLD_LOCK_ASSERT(); \ 125 retry: \ 126 TAILQ_FOREACH(lftmp, &linker_files, link) { \ 127 if (next_file_id == lftmp->id) { \ 128 next_file_id++; \ 129 goto retry; \ 130 } \ 131 } \ 132 (a) = next_file_id; \ 133 } while(0) 134 135 136 /* XXX wrong name; we're looking at version provision tags here, not modules */ 137 typedef TAILQ_HEAD(, modlist) modlisthead_t; 138 struct modlist { 139 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 140 linker_file_t container; 141 const char *name; 142 int version; 143 }; 144 typedef struct modlist *modlist_t; 145 static modlisthead_t found_modules; 146 147 static int linker_file_add_dependency(linker_file_t file, 148 linker_file_t dep); 149 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file, 150 const char* name, int deps); 151 static int linker_load_module(const char *kldname, 152 const char *modname, struct linker_file *parent, 153 struct mod_depend *verinfo, struct linker_file **lfpp); 154 static modlist_t modlist_lookup2(const char *name, struct mod_depend *verinfo); 155 156 static char * 157 linker_strdup(const char *str) 158 { 159 char *result; 160 161 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 162 strcpy(result, str); 163 return (result); 164 } 165 166 static void 167 linker_init(void *arg) 168 { 169 170 sx_init(&kld_sx, "kernel linker"); 171 TAILQ_INIT(&classes); 172 TAILQ_INIT(&linker_files); 173 } 174 175 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0); 176 177 static void 178 linker_stop_class_add(void *arg) 179 { 180 181 linker_no_more_classes = 1; 182 } 183 184 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL); 185 186 int 187 linker_add_class(linker_class_t lc) 188 { 189 190 /* 191 * We disallow any class registration past SI_ORDER_ANY 192 * of SI_SUB_KLD. We bump the reference count to keep the 193 * ops from being freed. 194 */ 195 if (linker_no_more_classes == 1) 196 return (EPERM); 197 kobj_class_compile((kobj_class_t) lc); 198 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */ 199 TAILQ_INSERT_TAIL(&classes, lc, link); 200 return (0); 201 } 202 203 static void 204 linker_file_sysinit(linker_file_t lf) 205 { 206 struct sysinit **start, **stop, **sipp, **xipp, *save; 207 208 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 209 lf->filename)); 210 211 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 212 return; 213 /* 214 * Perform a bubble sort of the system initialization objects by 215 * their subsystem (primary key) and order (secondary key). 216 * 217 * Since some things care about execution order, this is the operation 218 * which ensures continued function. 219 */ 220 for (sipp = start; sipp < stop; sipp++) { 221 for (xipp = sipp + 1; xipp < stop; xipp++) { 222 if ((*sipp)->subsystem < (*xipp)->subsystem || 223 ((*sipp)->subsystem == (*xipp)->subsystem && 224 (*sipp)->order <= (*xipp)->order)) 225 continue; /* skip */ 226 save = *sipp; 227 *sipp = *xipp; 228 *xipp = save; 229 } 230 } 231 232 /* 233 * Traverse the (now) ordered list of system initialization tasks. 234 * Perform each task, and continue on to the next task. 235 */ 236 mtx_lock(&Giant); 237 for (sipp = start; sipp < stop; sipp++) { 238 if ((*sipp)->subsystem == SI_SUB_DUMMY) 239 continue; /* skip dummy task(s) */ 240 241 /* Call function */ 242 (*((*sipp)->func)) ((*sipp)->udata); 243 } 244 mtx_unlock(&Giant); 245 } 246 247 static void 248 linker_file_sysuninit(linker_file_t lf) 249 { 250 struct sysinit **start, **stop, **sipp, **xipp, *save; 251 252 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 253 lf->filename)); 254 255 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 256 NULL) != 0) 257 return; 258 259 /* 260 * Perform a reverse bubble sort of the system initialization objects 261 * by their subsystem (primary key) and order (secondary key). 262 * 263 * Since some things care about execution order, this is the operation 264 * which ensures continued function. 265 */ 266 for (sipp = start; sipp < stop; sipp++) { 267 for (xipp = sipp + 1; xipp < stop; xipp++) { 268 if ((*sipp)->subsystem > (*xipp)->subsystem || 269 ((*sipp)->subsystem == (*xipp)->subsystem && 270 (*sipp)->order >= (*xipp)->order)) 271 continue; /* skip */ 272 save = *sipp; 273 *sipp = *xipp; 274 *xipp = save; 275 } 276 } 277 278 /* 279 * Traverse the (now) ordered list of system initialization tasks. 280 * Perform each task, and continue on to the next task. 281 */ 282 mtx_lock(&Giant); 283 for (sipp = start; sipp < stop; sipp++) { 284 if ((*sipp)->subsystem == SI_SUB_DUMMY) 285 continue; /* skip dummy task(s) */ 286 287 /* Call function */ 288 (*((*sipp)->func)) ((*sipp)->udata); 289 } 290 mtx_unlock(&Giant); 291 } 292 293 static void 294 linker_file_register_sysctls(linker_file_t lf) 295 { 296 struct sysctl_oid **start, **stop, **oidp; 297 298 KLD_DPF(FILE, 299 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 300 lf->filename)); 301 302 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 303 return; 304 305 sysctl_lock(); 306 for (oidp = start; oidp < stop; oidp++) 307 sysctl_register_oid(*oidp); 308 sysctl_unlock(); 309 } 310 311 static void 312 linker_file_unregister_sysctls(linker_file_t lf) 313 { 314 struct sysctl_oid **start, **stop, **oidp; 315 316 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs" 317 " for %s\n", lf->filename)); 318 319 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 320 return; 321 322 sysctl_lock(); 323 for (oidp = start; oidp < stop; oidp++) 324 sysctl_unregister_oid(*oidp); 325 sysctl_unlock(); 326 } 327 328 static int 329 linker_file_register_modules(linker_file_t lf) 330 { 331 struct mod_metadata **start, **stop, **mdp; 332 const moduledata_t *moddata; 333 int first_error, error; 334 335 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 336 " in %s\n", lf->filename)); 337 338 if (linker_file_lookup_set(lf, "modmetadata_set", &start, 339 &stop, NULL) != 0) { 340 /* 341 * This fallback should be unnecessary, but if we get booted 342 * from boot2 instead of loader and we are missing our 343 * metadata then we have to try the best we can. 344 */ 345 if (lf == linker_kernel_file) { 346 start = SET_BEGIN(modmetadata_set); 347 stop = SET_LIMIT(modmetadata_set); 348 } else 349 return (0); 350 } 351 first_error = 0; 352 for (mdp = start; mdp < stop; mdp++) { 353 if ((*mdp)->md_type != MDT_MODULE) 354 continue; 355 moddata = (*mdp)->md_data; 356 KLD_DPF(FILE, ("Registering module %s in %s\n", 357 moddata->name, lf->filename)); 358 error = module_register(moddata, lf); 359 if (error) { 360 printf("Module %s failed to register: %d\n", 361 moddata->name, error); 362 if (first_error == 0) 363 first_error = error; 364 } 365 } 366 return (first_error); 367 } 368 369 static void 370 linker_init_kernel_modules(void) 371 { 372 373 linker_file_register_modules(linker_kernel_file); 374 } 375 376 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 377 0); 378 379 static int 380 linker_load_file(const char *filename, linker_file_t *result) 381 { 382 linker_class_t lc; 383 linker_file_t lf; 384 int foundfile, error, modules; 385 386 /* Refuse to load modules if securelevel raised */ 387 if (prison0.pr_securelevel > 0) 388 return (EPERM); 389 390 KLD_LOCK_ASSERT(); 391 lf = linker_find_file_by_name(filename); 392 if (lf) { 393 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 394 " incrementing refs\n", filename)); 395 *result = lf; 396 lf->refs++; 397 return (0); 398 } 399 foundfile = 0; 400 error = 0; 401 402 /* 403 * We do not need to protect (lock) classes here because there is 404 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 405 * and there is no class deregistration mechanism at this time. 406 */ 407 TAILQ_FOREACH(lc, &classes, link) { 408 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 409 filename)); 410 error = LINKER_LOAD_FILE(lc, filename, &lf); 411 /* 412 * If we got something other than ENOENT, then it exists but 413 * we cannot load it for some other reason. 414 */ 415 if (error != ENOENT) 416 foundfile = 1; 417 if (lf) { 418 error = linker_file_register_modules(lf); 419 if (error == EEXIST) { 420 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 421 return (error); 422 } 423 modules = !TAILQ_EMPTY(&lf->modules); 424 KLD_UNLOCK(); 425 linker_file_register_sysctls(lf); 426 linker_file_sysinit(lf); 427 KLD_LOCK(); 428 lf->flags |= LINKER_FILE_LINKED; 429 430 /* 431 * If all of the modules in this file failed 432 * to load, unload the file and return an 433 * error of ENOEXEC. 434 */ 435 if (modules && TAILQ_EMPTY(&lf->modules)) { 436 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 437 return (ENOEXEC); 438 } 439 *result = lf; 440 return (0); 441 } 442 } 443 /* 444 * Less than ideal, but tells the user whether it failed to load or 445 * the module was not found. 446 */ 447 if (foundfile) { 448 449 /* 450 * If the file type has not been recognized by the last try 451 * printout a message before to fail. 452 */ 453 if (error == ENOSYS) 454 printf("linker_load_file: Unsupported file type\n"); 455 456 /* 457 * Format not recognized or otherwise unloadable. 458 * When loading a module that is statically built into 459 * the kernel EEXIST percolates back up as the return 460 * value. Preserve this so that apps like sysinstall 461 * can recognize this special case and not post bogus 462 * dialog boxes. 463 */ 464 if (error != EEXIST) 465 error = ENOEXEC; 466 } else 467 error = ENOENT; /* Nothing found */ 468 return (error); 469 } 470 471 int 472 linker_reference_module(const char *modname, struct mod_depend *verinfo, 473 linker_file_t *result) 474 { 475 modlist_t mod; 476 int error; 477 478 KLD_LOCK(); 479 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 480 *result = mod->container; 481 (*result)->refs++; 482 KLD_UNLOCK(); 483 return (0); 484 } 485 486 error = linker_load_module(NULL, modname, NULL, verinfo, result); 487 KLD_UNLOCK(); 488 return (error); 489 } 490 491 int 492 linker_release_module(const char *modname, struct mod_depend *verinfo, 493 linker_file_t lf) 494 { 495 modlist_t mod; 496 int error; 497 498 KLD_LOCK(); 499 if (lf == NULL) { 500 KASSERT(modname != NULL, 501 ("linker_release_module: no file or name")); 502 mod = modlist_lookup2(modname, verinfo); 503 if (mod == NULL) { 504 KLD_UNLOCK(); 505 return (ESRCH); 506 } 507 lf = mod->container; 508 } else 509 KASSERT(modname == NULL && verinfo == NULL, 510 ("linker_release_module: both file and name")); 511 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL); 512 KLD_UNLOCK(); 513 return (error); 514 } 515 516 static linker_file_t 517 linker_find_file_by_name(const char *filename) 518 { 519 linker_file_t lf; 520 char *koname; 521 522 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 523 sprintf(koname, "%s.ko", filename); 524 525 KLD_LOCK_ASSERT(); 526 TAILQ_FOREACH(lf, &linker_files, link) { 527 if (strcmp(lf->filename, koname) == 0) 528 break; 529 if (strcmp(lf->filename, filename) == 0) 530 break; 531 } 532 free(koname, M_LINKER); 533 return (lf); 534 } 535 536 static linker_file_t 537 linker_find_file_by_id(int fileid) 538 { 539 linker_file_t lf; 540 541 KLD_LOCK_ASSERT(); 542 TAILQ_FOREACH(lf, &linker_files, link) 543 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED) 544 break; 545 return (lf); 546 } 547 548 int 549 linker_file_foreach(linker_predicate_t *predicate, void *context) 550 { 551 linker_file_t lf; 552 int retval = 0; 553 554 KLD_LOCK(); 555 TAILQ_FOREACH(lf, &linker_files, link) { 556 retval = predicate(lf, context); 557 if (retval != 0) 558 break; 559 } 560 KLD_UNLOCK(); 561 return (retval); 562 } 563 564 linker_file_t 565 linker_make_file(const char *pathname, linker_class_t lc) 566 { 567 linker_file_t lf; 568 const char *filename; 569 570 KLD_LOCK_ASSERT(); 571 filename = linker_basename(pathname); 572 573 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname)); 574 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 575 if (lf == NULL) 576 return (NULL); 577 lf->refs = 1; 578 lf->userrefs = 0; 579 lf->flags = 0; 580 lf->filename = linker_strdup(filename); 581 lf->pathname = linker_strdup(pathname); 582 LINKER_GET_NEXT_FILE_ID(lf->id); 583 lf->ndeps = 0; 584 lf->deps = NULL; 585 lf->loadcnt = ++loadcnt; 586 STAILQ_INIT(&lf->common); 587 TAILQ_INIT(&lf->modules); 588 TAILQ_INSERT_TAIL(&linker_files, lf, link); 589 return (lf); 590 } 591 592 int 593 linker_file_unload(linker_file_t file, int flags) 594 { 595 module_t mod, next; 596 modlist_t ml, nextml; 597 struct common_symbol *cp; 598 int error, i; 599 600 /* Refuse to unload modules if securelevel raised. */ 601 if (prison0.pr_securelevel > 0) 602 return (EPERM); 603 604 KLD_LOCK_ASSERT(); 605 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 606 607 /* Easy case of just dropping a reference. */ 608 if (file->refs > 1) { 609 file->refs--; 610 return (0); 611 } 612 613 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 614 " informing modules\n")); 615 616 /* 617 * Quiesce all the modules to give them a chance to veto the unload. 618 */ 619 MOD_SLOCK; 620 for (mod = TAILQ_FIRST(&file->modules); mod; 621 mod = module_getfnext(mod)) { 622 623 error = module_quiesce(mod); 624 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 625 KLD_DPF(FILE, ("linker_file_unload: module %s" 626 " vetoed unload\n", module_getname(mod))); 627 /* 628 * XXX: Do we need to tell all the quiesced modules 629 * that they can resume work now via a new module 630 * event? 631 */ 632 MOD_SUNLOCK; 633 return (error); 634 } 635 } 636 MOD_SUNLOCK; 637 638 /* 639 * Inform any modules associated with this file that they are 640 * being unloaded. 641 */ 642 MOD_XLOCK; 643 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 644 next = module_getfnext(mod); 645 MOD_XUNLOCK; 646 647 /* 648 * Give the module a chance to veto the unload. 649 */ 650 if ((error = module_unload(mod)) != 0) { 651 #ifdef KLD_DEBUG 652 MOD_SLOCK; 653 KLD_DPF(FILE, ("linker_file_unload: module %s" 654 " failed unload\n", module_getname(mod))); 655 MOD_SUNLOCK; 656 #endif 657 return (error); 658 } 659 MOD_XLOCK; 660 module_release(mod); 661 } 662 MOD_XUNLOCK; 663 664 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 665 if (ml->container == file) { 666 TAILQ_REMOVE(&found_modules, ml, link); 667 free(ml, M_LINKER); 668 } 669 } 670 671 /* 672 * Don't try to run SYSUNINITs if we are unloaded due to a 673 * link error. 674 */ 675 if (file->flags & LINKER_FILE_LINKED) { 676 file->flags &= ~LINKER_FILE_LINKED; 677 KLD_UNLOCK(); 678 linker_file_sysuninit(file); 679 linker_file_unregister_sysctls(file); 680 KLD_LOCK(); 681 } 682 TAILQ_REMOVE(&linker_files, file, link); 683 684 if (file->deps) { 685 for (i = 0; i < file->ndeps; i++) 686 linker_file_unload(file->deps[i], flags); 687 free(file->deps, M_LINKER); 688 file->deps = NULL; 689 } 690 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 691 STAILQ_REMOVE_HEAD(&file->common, link); 692 free(cp, M_LINKER); 693 } 694 695 LINKER_UNLOAD(file); 696 if (file->filename) { 697 free(file->filename, M_LINKER); 698 file->filename = NULL; 699 } 700 if (file->pathname) { 701 free(file->pathname, M_LINKER); 702 file->pathname = NULL; 703 } 704 kobj_delete((kobj_t) file, M_LINKER); 705 return (0); 706 } 707 708 int 709 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 710 { 711 return (LINKER_CTF_GET(file, lc)); 712 } 713 714 static int 715 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 716 { 717 linker_file_t *newdeps; 718 719 KLD_LOCK_ASSERT(); 720 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 721 M_LINKER, M_WAITOK | M_ZERO); 722 if (newdeps == NULL) 723 return (ENOMEM); 724 725 if (file->deps) { 726 bcopy(file->deps, newdeps, 727 file->ndeps * sizeof(linker_file_t *)); 728 free(file->deps, M_LINKER); 729 } 730 file->deps = newdeps; 731 file->deps[file->ndeps] = dep; 732 file->ndeps++; 733 KLD_DPF(FILE, ("linker_file_add_dependency:" 734 " adding %s as dependency for %s\n", 735 dep->filename, file->filename)); 736 return (0); 737 } 738 739 /* 740 * Locate a linker set and its contents. This is a helper function to avoid 741 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 742 * This function is used in this file so we can avoid having lots of (void **) 743 * casts. 744 */ 745 int 746 linker_file_lookup_set(linker_file_t file, const char *name, 747 void *firstp, void *lastp, int *countp) 748 { 749 int error, locked; 750 751 locked = KLD_LOCKED(); 752 if (!locked) 753 KLD_LOCK(); 754 error = LINKER_LOOKUP_SET(file, name, firstp, lastp, countp); 755 if (!locked) 756 KLD_UNLOCK(); 757 return (error); 758 } 759 760 /* 761 * List all functions in a file. 762 */ 763 int 764 linker_file_function_listall(linker_file_t lf, 765 linker_function_nameval_callback_t callback_func, void *arg) 766 { 767 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 768 } 769 770 caddr_t 771 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 772 { 773 caddr_t sym; 774 int locked; 775 776 locked = KLD_LOCKED(); 777 if (!locked) 778 KLD_LOCK(); 779 sym = linker_file_lookup_symbol_internal(file, name, deps); 780 if (!locked) 781 KLD_UNLOCK(); 782 return (sym); 783 } 784 785 static caddr_t 786 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 787 int deps) 788 { 789 c_linker_sym_t sym; 790 linker_symval_t symval; 791 caddr_t address; 792 size_t common_size = 0; 793 int i; 794 795 KLD_LOCK_ASSERT(); 796 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 797 file, name, deps)); 798 799 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 800 LINKER_SYMBOL_VALUES(file, sym, &symval); 801 if (symval.value == 0) 802 /* 803 * For commons, first look them up in the 804 * dependencies and only allocate space if not found 805 * there. 806 */ 807 common_size = symval.size; 808 else { 809 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 810 ".value=%p\n", symval.value)); 811 return (symval.value); 812 } 813 } 814 if (deps) { 815 for (i = 0; i < file->ndeps; i++) { 816 address = linker_file_lookup_symbol_internal( 817 file->deps[i], name, 0); 818 if (address) { 819 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 820 " deps value=%p\n", address)); 821 return (address); 822 } 823 } 824 } 825 if (common_size > 0) { 826 /* 827 * This is a common symbol which was not found in the 828 * dependencies. We maintain a simple common symbol table in 829 * the file object. 830 */ 831 struct common_symbol *cp; 832 833 STAILQ_FOREACH(cp, &file->common, link) { 834 if (strcmp(cp->name, name) == 0) { 835 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 836 " old common value=%p\n", cp->address)); 837 return (cp->address); 838 } 839 } 840 /* 841 * Round the symbol size up to align. 842 */ 843 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 844 cp = malloc(sizeof(struct common_symbol) 845 + common_size + strlen(name) + 1, M_LINKER, 846 M_WAITOK | M_ZERO); 847 cp->address = (caddr_t)(cp + 1); 848 cp->name = cp->address + common_size; 849 strcpy(cp->name, name); 850 bzero(cp->address, common_size); 851 STAILQ_INSERT_TAIL(&file->common, cp, link); 852 853 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 854 " value=%p\n", cp->address)); 855 return (cp->address); 856 } 857 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 858 return (0); 859 } 860 861 /* 862 * Both DDB and stack(9) rely on the kernel linker to provide forward and 863 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 864 * do this in a lockfree manner. We provide a set of internal helper 865 * routines to perform these operations without locks, and then wrappers that 866 * optionally lock. 867 * 868 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 869 */ 870 #ifdef DDB 871 static int 872 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 873 { 874 linker_file_t lf; 875 876 TAILQ_FOREACH(lf, &linker_files, link) { 877 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 878 return (0); 879 } 880 return (ENOENT); 881 } 882 #endif 883 884 static int 885 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 886 { 887 linker_file_t lf; 888 c_linker_sym_t best, es; 889 u_long diff, bestdiff, off; 890 891 best = 0; 892 off = (uintptr_t)value; 893 bestdiff = off; 894 TAILQ_FOREACH(lf, &linker_files, link) { 895 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 896 continue; 897 if (es != 0 && diff < bestdiff) { 898 best = es; 899 bestdiff = diff; 900 } 901 if (bestdiff == 0) 902 break; 903 } 904 if (best) { 905 *sym = best; 906 *diffp = bestdiff; 907 return (0); 908 } else { 909 *sym = 0; 910 *diffp = off; 911 return (ENOENT); 912 } 913 } 914 915 static int 916 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 917 { 918 linker_file_t lf; 919 920 TAILQ_FOREACH(lf, &linker_files, link) { 921 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 922 return (0); 923 } 924 return (ENOENT); 925 } 926 927 static int 928 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 929 long *offset) 930 { 931 linker_symval_t symval; 932 c_linker_sym_t sym; 933 int error; 934 935 *offset = 0; 936 error = linker_debug_search_symbol(value, &sym, offset); 937 if (error) 938 return (error); 939 error = linker_debug_symbol_values(sym, &symval); 940 if (error) 941 return (error); 942 strlcpy(buf, symval.name, buflen); 943 return (0); 944 } 945 946 /* 947 * DDB Helpers. DDB has to look across multiple files with their own symbol 948 * tables and string tables. 949 * 950 * Note that we do not obey list locking protocols here. We really don't need 951 * DDB to hang because somebody's got the lock held. We'll take the chance 952 * that the files list is inconsistant instead. 953 */ 954 #ifdef DDB 955 int 956 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 957 { 958 959 return (linker_debug_lookup(symstr, sym)); 960 } 961 #endif 962 963 int 964 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 965 { 966 967 return (linker_debug_search_symbol(value, sym, diffp)); 968 } 969 970 int 971 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 972 { 973 974 return (linker_debug_symbol_values(sym, symval)); 975 } 976 977 int 978 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 979 long *offset) 980 { 981 982 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 983 } 984 985 /* 986 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 987 * obey locking protocols, and offer a significantly less complex interface. 988 */ 989 int 990 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 991 long *offset) 992 { 993 int error; 994 995 KLD_LOCK(); 996 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 997 KLD_UNLOCK(); 998 return (error); 999 } 1000 1001 /* 1002 * Syscalls. 1003 */ 1004 int 1005 kern_kldload(struct thread *td, const char *file, int *fileid) 1006 { 1007 #ifdef HWPMC_HOOKS 1008 struct pmckern_map_in pkm; 1009 #endif 1010 const char *kldname, *modname; 1011 linker_file_t lf; 1012 int error; 1013 1014 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1015 return (error); 1016 1017 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1018 return (error); 1019 1020 /* 1021 * It is possible that kldloaded module will attach a new ifnet, 1022 * so vnet context must be set when this ocurs. 1023 */ 1024 CURVNET_SET(TD_TO_VNET(td)); 1025 1026 /* 1027 * If file does not contain a qualified name or any dot in it 1028 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1029 * name. 1030 */ 1031 if (strchr(file, '/') || strchr(file, '.')) { 1032 kldname = file; 1033 modname = NULL; 1034 } else { 1035 kldname = NULL; 1036 modname = file; 1037 } 1038 1039 KLD_LOCK(); 1040 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1041 if (error) { 1042 KLD_UNLOCK(); 1043 goto done; 1044 } 1045 lf->userrefs++; 1046 if (fileid != NULL) 1047 *fileid = lf->id; 1048 1049 EVENTHANDLER_INVOKE(mod_load, lf); 1050 1051 #ifdef HWPMC_HOOKS 1052 KLD_DOWNGRADE(); 1053 pkm.pm_file = lf->filename; 1054 pkm.pm_address = (uintptr_t) lf->address; 1055 PMC_CALL_HOOK(td, PMC_FN_KLD_LOAD, (void *) &pkm); 1056 KLD_UNLOCK_READ(); 1057 #else 1058 KLD_UNLOCK(); 1059 #endif 1060 1061 done: 1062 CURVNET_RESTORE(); 1063 return (error); 1064 } 1065 1066 int 1067 sys_kldload(struct thread *td, struct kldload_args *uap) 1068 { 1069 char *pathname = NULL; 1070 int error, fileid; 1071 1072 td->td_retval[0] = -1; 1073 1074 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1075 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1076 if (error == 0) { 1077 error = kern_kldload(td, pathname, &fileid); 1078 if (error == 0) 1079 td->td_retval[0] = fileid; 1080 } 1081 free(pathname, M_TEMP); 1082 return (error); 1083 } 1084 1085 int 1086 kern_kldunload(struct thread *td, int fileid, int flags) 1087 { 1088 #ifdef HWPMC_HOOKS 1089 struct pmckern_map_out pkm; 1090 #endif 1091 linker_file_t lf; 1092 int error = 0; 1093 1094 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1095 return (error); 1096 1097 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1098 return (error); 1099 1100 CURVNET_SET(TD_TO_VNET(td)); 1101 KLD_LOCK(); 1102 lf = linker_find_file_by_id(fileid); 1103 if (lf) { 1104 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1105 1106 EVENTHANDLER_INVOKE(mod_unload, lf, &error); 1107 if (error != 0) 1108 error = EBUSY; 1109 else if (lf->userrefs == 0) { 1110 /* 1111 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1112 */ 1113 printf("kldunload: attempt to unload file that was" 1114 " loaded by the kernel\n"); 1115 error = EBUSY; 1116 } else { 1117 #ifdef HWPMC_HOOKS 1118 /* Save data needed by hwpmc(4) before unloading. */ 1119 pkm.pm_address = (uintptr_t) lf->address; 1120 pkm.pm_size = lf->size; 1121 #endif 1122 lf->userrefs--; 1123 error = linker_file_unload(lf, flags); 1124 if (error) 1125 lf->userrefs++; 1126 } 1127 } else 1128 error = ENOENT; 1129 1130 #ifdef HWPMC_HOOKS 1131 if (error == 0) { 1132 KLD_DOWNGRADE(); 1133 PMC_CALL_HOOK(td, PMC_FN_KLD_UNLOAD, (void *) &pkm); 1134 KLD_UNLOCK_READ(); 1135 } else 1136 KLD_UNLOCK(); 1137 #else 1138 KLD_UNLOCK(); 1139 #endif 1140 CURVNET_RESTORE(); 1141 return (error); 1142 } 1143 1144 int 1145 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1146 { 1147 1148 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1149 } 1150 1151 int 1152 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1153 { 1154 1155 if (uap->flags != LINKER_UNLOAD_NORMAL && 1156 uap->flags != LINKER_UNLOAD_FORCE) 1157 return (EINVAL); 1158 return (kern_kldunload(td, uap->fileid, uap->flags)); 1159 } 1160 1161 int 1162 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1163 { 1164 char *pathname; 1165 const char *filename; 1166 linker_file_t lf; 1167 int error; 1168 1169 #ifdef MAC 1170 error = mac_kld_check_stat(td->td_ucred); 1171 if (error) 1172 return (error); 1173 #endif 1174 1175 td->td_retval[0] = -1; 1176 1177 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1178 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1179 goto out; 1180 1181 filename = linker_basename(pathname); 1182 KLD_LOCK(); 1183 lf = linker_find_file_by_name(filename); 1184 if (lf) 1185 td->td_retval[0] = lf->id; 1186 else 1187 error = ENOENT; 1188 KLD_UNLOCK(); 1189 out: 1190 free(pathname, M_TEMP); 1191 return (error); 1192 } 1193 1194 int 1195 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1196 { 1197 linker_file_t lf; 1198 int error = 0; 1199 1200 #ifdef MAC 1201 error = mac_kld_check_stat(td->td_ucred); 1202 if (error) 1203 return (error); 1204 #endif 1205 1206 KLD_LOCK(); 1207 if (uap->fileid == 0) 1208 lf = TAILQ_FIRST(&linker_files); 1209 else { 1210 lf = linker_find_file_by_id(uap->fileid); 1211 if (lf == NULL) { 1212 error = ENOENT; 1213 goto out; 1214 } 1215 lf = TAILQ_NEXT(lf, link); 1216 } 1217 1218 /* Skip partially loaded files. */ 1219 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1220 lf = TAILQ_NEXT(lf, link); 1221 1222 if (lf) 1223 td->td_retval[0] = lf->id; 1224 else 1225 td->td_retval[0] = 0; 1226 out: 1227 KLD_UNLOCK(); 1228 return (error); 1229 } 1230 1231 int 1232 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1233 { 1234 struct kld_file_stat stat; 1235 int error, version; 1236 1237 /* 1238 * Check the version of the user's structure. 1239 */ 1240 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1241 != 0) 1242 return (error); 1243 if (version != sizeof(struct kld_file_stat_1) && 1244 version != sizeof(struct kld_file_stat)) 1245 return (EINVAL); 1246 1247 error = kern_kldstat(td, uap->fileid, &stat); 1248 if (error != 0) 1249 return (error); 1250 return (copyout(&stat, uap->stat, version)); 1251 } 1252 1253 int 1254 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat) 1255 { 1256 linker_file_t lf; 1257 int namelen; 1258 #ifdef MAC 1259 int error; 1260 1261 error = mac_kld_check_stat(td->td_ucred); 1262 if (error) 1263 return (error); 1264 #endif 1265 1266 KLD_LOCK(); 1267 lf = linker_find_file_by_id(fileid); 1268 if (lf == NULL) { 1269 KLD_UNLOCK(); 1270 return (ENOENT); 1271 } 1272 1273 /* Version 1 fields: */ 1274 namelen = strlen(lf->filename) + 1; 1275 if (namelen > MAXPATHLEN) 1276 namelen = MAXPATHLEN; 1277 bcopy(lf->filename, &stat->name[0], namelen); 1278 stat->refs = lf->refs; 1279 stat->id = lf->id; 1280 stat->address = lf->address; 1281 stat->size = lf->size; 1282 /* Version 2 fields: */ 1283 namelen = strlen(lf->pathname) + 1; 1284 if (namelen > MAXPATHLEN) 1285 namelen = MAXPATHLEN; 1286 bcopy(lf->pathname, &stat->pathname[0], namelen); 1287 KLD_UNLOCK(); 1288 1289 td->td_retval[0] = 0; 1290 return (0); 1291 } 1292 1293 int 1294 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1295 { 1296 linker_file_t lf; 1297 module_t mp; 1298 int error = 0; 1299 1300 #ifdef MAC 1301 error = mac_kld_check_stat(td->td_ucred); 1302 if (error) 1303 return (error); 1304 #endif 1305 1306 KLD_LOCK(); 1307 lf = linker_find_file_by_id(uap->fileid); 1308 if (lf) { 1309 MOD_SLOCK; 1310 mp = TAILQ_FIRST(&lf->modules); 1311 if (mp != NULL) 1312 td->td_retval[0] = module_getid(mp); 1313 else 1314 td->td_retval[0] = 0; 1315 MOD_SUNLOCK; 1316 } else 1317 error = ENOENT; 1318 KLD_UNLOCK(); 1319 return (error); 1320 } 1321 1322 int 1323 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1324 { 1325 char *symstr = NULL; 1326 c_linker_sym_t sym; 1327 linker_symval_t symval; 1328 linker_file_t lf; 1329 struct kld_sym_lookup lookup; 1330 int error = 0; 1331 1332 #ifdef MAC 1333 error = mac_kld_check_stat(td->td_ucred); 1334 if (error) 1335 return (error); 1336 #endif 1337 1338 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1339 return (error); 1340 if (lookup.version != sizeof(lookup) || 1341 uap->cmd != KLDSYM_LOOKUP) 1342 return (EINVAL); 1343 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1344 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1345 goto out; 1346 KLD_LOCK(); 1347 if (uap->fileid != 0) { 1348 lf = linker_find_file_by_id(uap->fileid); 1349 if (lf == NULL) 1350 error = ENOENT; 1351 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1352 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1353 lookup.symvalue = (uintptr_t) symval.value; 1354 lookup.symsize = symval.size; 1355 error = copyout(&lookup, uap->data, sizeof(lookup)); 1356 } else 1357 error = ENOENT; 1358 } else { 1359 TAILQ_FOREACH(lf, &linker_files, link) { 1360 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1361 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1362 lookup.symvalue = (uintptr_t)symval.value; 1363 lookup.symsize = symval.size; 1364 error = copyout(&lookup, uap->data, 1365 sizeof(lookup)); 1366 break; 1367 } 1368 } 1369 if (lf == NULL) 1370 error = ENOENT; 1371 } 1372 KLD_UNLOCK(); 1373 out: 1374 free(symstr, M_TEMP); 1375 return (error); 1376 } 1377 1378 /* 1379 * Preloaded module support 1380 */ 1381 1382 static modlist_t 1383 modlist_lookup(const char *name, int ver) 1384 { 1385 modlist_t mod; 1386 1387 TAILQ_FOREACH(mod, &found_modules, link) { 1388 if (strcmp(mod->name, name) == 0 && 1389 (ver == 0 || mod->version == ver)) 1390 return (mod); 1391 } 1392 return (NULL); 1393 } 1394 1395 static modlist_t 1396 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1397 { 1398 modlist_t mod, bestmod; 1399 int ver; 1400 1401 if (verinfo == NULL) 1402 return (modlist_lookup(name, 0)); 1403 bestmod = NULL; 1404 TAILQ_FOREACH(mod, &found_modules, link) { 1405 if (strcmp(mod->name, name) != 0) 1406 continue; 1407 ver = mod->version; 1408 if (ver == verinfo->md_ver_preferred) 1409 return (mod); 1410 if (ver >= verinfo->md_ver_minimum && 1411 ver <= verinfo->md_ver_maximum && 1412 (bestmod == NULL || ver > bestmod->version)) 1413 bestmod = mod; 1414 } 1415 return (bestmod); 1416 } 1417 1418 static modlist_t 1419 modlist_newmodule(const char *modname, int version, linker_file_t container) 1420 { 1421 modlist_t mod; 1422 1423 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1424 if (mod == NULL) 1425 panic("no memory for module list"); 1426 mod->container = container; 1427 mod->name = modname; 1428 mod->version = version; 1429 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1430 return (mod); 1431 } 1432 1433 static void 1434 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1435 struct mod_metadata **stop, int preload) 1436 { 1437 struct mod_metadata *mp, **mdp; 1438 const char *modname; 1439 int ver; 1440 1441 for (mdp = start; mdp < stop; mdp++) { 1442 mp = *mdp; 1443 if (mp->md_type != MDT_VERSION) 1444 continue; 1445 modname = mp->md_cval; 1446 ver = ((struct mod_version *)mp->md_data)->mv_version; 1447 if (modlist_lookup(modname, ver) != NULL) { 1448 printf("module %s already present!\n", modname); 1449 /* XXX what can we do? this is a build error. :-( */ 1450 continue; 1451 } 1452 modlist_newmodule(modname, ver, lf); 1453 } 1454 } 1455 1456 static void 1457 linker_preload(void *arg) 1458 { 1459 caddr_t modptr; 1460 const char *modname, *nmodname; 1461 char *modtype; 1462 linker_file_t lf, nlf; 1463 linker_class_t lc; 1464 int error; 1465 linker_file_list_t loaded_files; 1466 linker_file_list_t depended_files; 1467 struct mod_metadata *mp, *nmp; 1468 struct mod_metadata **start, **stop, **mdp, **nmdp; 1469 struct mod_depend *verinfo; 1470 int nver; 1471 int resolves; 1472 modlist_t mod; 1473 struct sysinit **si_start, **si_stop; 1474 1475 TAILQ_INIT(&loaded_files); 1476 TAILQ_INIT(&depended_files); 1477 TAILQ_INIT(&found_modules); 1478 error = 0; 1479 1480 modptr = NULL; 1481 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1482 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1483 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1484 if (modname == NULL) { 1485 printf("Preloaded module at %p does not have a" 1486 " name!\n", modptr); 1487 continue; 1488 } 1489 if (modtype == NULL) { 1490 printf("Preloaded module at %p does not have a type!\n", 1491 modptr); 1492 continue; 1493 } 1494 if (bootverbose) 1495 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1496 modptr); 1497 lf = NULL; 1498 TAILQ_FOREACH(lc, &classes, link) { 1499 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1500 if (!error) 1501 break; 1502 lf = NULL; 1503 } 1504 if (lf) 1505 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1506 } 1507 1508 /* 1509 * First get a list of stuff in the kernel. 1510 */ 1511 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1512 &stop, NULL) == 0) 1513 linker_addmodules(linker_kernel_file, start, stop, 1); 1514 1515 /* 1516 * This is a once-off kinky bubble sort to resolve relocation 1517 * dependency requirements. 1518 */ 1519 restart: 1520 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1521 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1522 &stop, NULL); 1523 /* 1524 * First, look to see if we would successfully link with this 1525 * stuff. 1526 */ 1527 resolves = 1; /* unless we know otherwise */ 1528 if (!error) { 1529 for (mdp = start; mdp < stop; mdp++) { 1530 mp = *mdp; 1531 if (mp->md_type != MDT_DEPEND) 1532 continue; 1533 modname = mp->md_cval; 1534 verinfo = mp->md_data; 1535 for (nmdp = start; nmdp < stop; nmdp++) { 1536 nmp = *nmdp; 1537 if (nmp->md_type != MDT_VERSION) 1538 continue; 1539 nmodname = nmp->md_cval; 1540 if (strcmp(modname, nmodname) == 0) 1541 break; 1542 } 1543 if (nmdp < stop) /* it's a self reference */ 1544 continue; 1545 1546 /* 1547 * ok, the module isn't here yet, we 1548 * are not finished 1549 */ 1550 if (modlist_lookup2(modname, verinfo) == NULL) 1551 resolves = 0; 1552 } 1553 } 1554 /* 1555 * OK, if we found our modules, we can link. So, "provide" 1556 * the modules inside and add it to the end of the link order 1557 * list. 1558 */ 1559 if (resolves) { 1560 if (!error) { 1561 for (mdp = start; mdp < stop; mdp++) { 1562 mp = *mdp; 1563 if (mp->md_type != MDT_VERSION) 1564 continue; 1565 modname = mp->md_cval; 1566 nver = ((struct mod_version *) 1567 mp->md_data)->mv_version; 1568 if (modlist_lookup(modname, 1569 nver) != NULL) { 1570 printf("module %s already" 1571 " present!\n", modname); 1572 TAILQ_REMOVE(&loaded_files, 1573 lf, loaded); 1574 linker_file_unload(lf, 1575 LINKER_UNLOAD_FORCE); 1576 /* we changed tailq next ptr */ 1577 goto restart; 1578 } 1579 modlist_newmodule(modname, nver, lf); 1580 } 1581 } 1582 TAILQ_REMOVE(&loaded_files, lf, loaded); 1583 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1584 /* 1585 * Since we provided modules, we need to restart the 1586 * sort so that the previous files that depend on us 1587 * have a chance. Also, we've busted the tailq next 1588 * pointer with the REMOVE. 1589 */ 1590 goto restart; 1591 } 1592 } 1593 1594 /* 1595 * At this point, we check to see what could not be resolved.. 1596 */ 1597 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1598 TAILQ_REMOVE(&loaded_files, lf, loaded); 1599 printf("KLD file %s is missing dependencies\n", lf->filename); 1600 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1601 } 1602 1603 /* 1604 * We made it. Finish off the linking in the order we determined. 1605 */ 1606 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1607 if (linker_kernel_file) { 1608 linker_kernel_file->refs++; 1609 error = linker_file_add_dependency(lf, 1610 linker_kernel_file); 1611 if (error) 1612 panic("cannot add dependency"); 1613 } 1614 lf->userrefs++; /* so we can (try to) kldunload it */ 1615 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1616 &stop, NULL); 1617 if (!error) { 1618 for (mdp = start; mdp < stop; mdp++) { 1619 mp = *mdp; 1620 if (mp->md_type != MDT_DEPEND) 1621 continue; 1622 modname = mp->md_cval; 1623 verinfo = mp->md_data; 1624 mod = modlist_lookup2(modname, verinfo); 1625 if (mod == NULL) { 1626 printf("KLD file %s - cannot find " 1627 "dependency \"%s\"\n", 1628 lf->filename, modname); 1629 goto fail; 1630 } 1631 /* Don't count self-dependencies */ 1632 if (lf == mod->container) 1633 continue; 1634 mod->container->refs++; 1635 error = linker_file_add_dependency(lf, 1636 mod->container); 1637 if (error) 1638 panic("cannot add dependency"); 1639 } 1640 } 1641 /* 1642 * Now do relocation etc using the symbol search paths 1643 * established by the dependencies 1644 */ 1645 error = LINKER_LINK_PRELOAD_FINISH(lf); 1646 if (error) { 1647 printf("KLD file %s - could not finalize loading\n", 1648 lf->filename); 1649 goto fail; 1650 } 1651 linker_file_register_modules(lf); 1652 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1653 &si_stop, NULL) == 0) 1654 sysinit_add(si_start, si_stop); 1655 linker_file_register_sysctls(lf); 1656 lf->flags |= LINKER_FILE_LINKED; 1657 continue; 1658 fail: 1659 TAILQ_REMOVE(&depended_files, lf, loaded); 1660 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1661 } 1662 /* woohoo! we made it! */ 1663 } 1664 1665 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1666 1667 /* 1668 * Search for a not-loaded module by name. 1669 * 1670 * Modules may be found in the following locations: 1671 * 1672 * - preloaded (result is just the module name) - on disk (result is full path 1673 * to module) 1674 * 1675 * If the module name is qualified in any way (contains path, etc.) the we 1676 * simply return a copy of it. 1677 * 1678 * The search path can be manipulated via sysctl. Note that we use the ';' 1679 * character as a separator to be consistent with the bootloader. 1680 */ 1681 1682 static char linker_hintfile[] = "linker.hints"; 1683 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1684 1685 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1686 sizeof(linker_path), "module load search path"); 1687 1688 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1689 1690 static char *linker_ext_list[] = { 1691 "", 1692 ".ko", 1693 NULL 1694 }; 1695 1696 /* 1697 * Check if file actually exists either with or without extension listed in 1698 * the linker_ext_list. (probably should be generic for the rest of the 1699 * kernel) 1700 */ 1701 static char * 1702 linker_lookup_file(const char *path, int pathlen, const char *name, 1703 int namelen, struct vattr *vap) 1704 { 1705 struct nameidata nd; 1706 struct thread *td = curthread; /* XXX */ 1707 char *result, **cpp, *sep; 1708 int error, len, extlen, reclen, flags; 1709 enum vtype type; 1710 1711 extlen = 0; 1712 for (cpp = linker_ext_list; *cpp; cpp++) { 1713 len = strlen(*cpp); 1714 if (len > extlen) 1715 extlen = len; 1716 } 1717 extlen++; /* trailing '\0' */ 1718 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1719 1720 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1721 result = malloc(reclen, M_LINKER, M_WAITOK); 1722 for (cpp = linker_ext_list; *cpp; cpp++) { 1723 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1724 namelen, name, *cpp); 1725 /* 1726 * Attempt to open the file, and return the path if 1727 * we succeed and it's a regular file. 1728 */ 1729 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1730 flags = FREAD; 1731 error = vn_open(&nd, &flags, 0, NULL); 1732 if (error == 0) { 1733 NDFREE(&nd, NDF_ONLY_PNBUF); 1734 type = nd.ni_vp->v_type; 1735 if (vap) 1736 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1737 VOP_UNLOCK(nd.ni_vp, 0); 1738 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1739 if (type == VREG) 1740 return (result); 1741 } 1742 } 1743 free(result, M_LINKER); 1744 return (NULL); 1745 } 1746 1747 #define INT_ALIGN(base, ptr) ptr = \ 1748 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 1749 1750 /* 1751 * Lookup KLD which contains requested module in the "linker.hints" file. If 1752 * version specification is available, then try to find the best KLD. 1753 * Otherwise just find the latest one. 1754 */ 1755 static char * 1756 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1757 int modnamelen, struct mod_depend *verinfo) 1758 { 1759 struct thread *td = curthread; /* XXX */ 1760 struct ucred *cred = td ? td->td_ucred : NULL; 1761 struct nameidata nd; 1762 struct vattr vattr, mattr; 1763 u_char *hints = NULL; 1764 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1765 int error, ival, bestver, *intp, found, flags, clen, blen; 1766 ssize_t reclen; 1767 1768 result = NULL; 1769 bestver = found = 0; 1770 1771 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1772 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1773 strlen(sep) + 1; 1774 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1775 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1776 linker_hintfile); 1777 1778 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1779 flags = FREAD; 1780 error = vn_open(&nd, &flags, 0, NULL); 1781 if (error) 1782 goto bad; 1783 NDFREE(&nd, NDF_ONLY_PNBUF); 1784 if (nd.ni_vp->v_type != VREG) 1785 goto bad; 1786 best = cp = NULL; 1787 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1788 if (error) 1789 goto bad; 1790 /* 1791 * XXX: we need to limit this number to some reasonable value 1792 */ 1793 if (vattr.va_size > 100 * 1024) { 1794 printf("hints file too large %ld\n", (long)vattr.va_size); 1795 goto bad; 1796 } 1797 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1798 if (hints == NULL) 1799 goto bad; 1800 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1801 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1802 if (error) 1803 goto bad; 1804 VOP_UNLOCK(nd.ni_vp, 0); 1805 vn_close(nd.ni_vp, FREAD, cred, td); 1806 nd.ni_vp = NULL; 1807 if (reclen != 0) { 1808 printf("can't read %zd\n", reclen); 1809 goto bad; 1810 } 1811 intp = (int *)hints; 1812 ival = *intp++; 1813 if (ival != LINKER_HINTS_VERSION) { 1814 printf("hints file version mismatch %d\n", ival); 1815 goto bad; 1816 } 1817 bufend = hints + vattr.va_size; 1818 recptr = (u_char *)intp; 1819 clen = blen = 0; 1820 while (recptr < bufend && !found) { 1821 intp = (int *)recptr; 1822 reclen = *intp++; 1823 ival = *intp++; 1824 cp = (char *)intp; 1825 switch (ival) { 1826 case MDT_VERSION: 1827 clen = *cp++; 1828 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1829 break; 1830 cp += clen; 1831 INT_ALIGN(hints, cp); 1832 ival = *(int *)cp; 1833 cp += sizeof(int); 1834 clen = *cp++; 1835 if (verinfo == NULL || 1836 ival == verinfo->md_ver_preferred) { 1837 found = 1; 1838 break; 1839 } 1840 if (ival >= verinfo->md_ver_minimum && 1841 ival <= verinfo->md_ver_maximum && 1842 ival > bestver) { 1843 bestver = ival; 1844 best = cp; 1845 blen = clen; 1846 } 1847 break; 1848 default: 1849 break; 1850 } 1851 recptr += reclen + sizeof(int); 1852 } 1853 /* 1854 * Finally check if KLD is in the place 1855 */ 1856 if (found) 1857 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1858 else if (best) 1859 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1860 1861 /* 1862 * KLD is newer than hints file. What we should do now? 1863 */ 1864 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1865 printf("warning: KLD '%s' is newer than the linker.hints" 1866 " file\n", result); 1867 bad: 1868 free(pathbuf, M_LINKER); 1869 if (hints) 1870 free(hints, M_TEMP); 1871 if (nd.ni_vp != NULL) { 1872 VOP_UNLOCK(nd.ni_vp, 0); 1873 vn_close(nd.ni_vp, FREAD, cred, td); 1874 } 1875 /* 1876 * If nothing found or hints is absent - fallback to the old 1877 * way by using "kldname[.ko]" as module name. 1878 */ 1879 if (!found && !bestver && result == NULL) 1880 result = linker_lookup_file(path, pathlen, modname, 1881 modnamelen, NULL); 1882 return (result); 1883 } 1884 1885 /* 1886 * Lookup KLD which contains requested module in the all directories. 1887 */ 1888 static char * 1889 linker_search_module(const char *modname, int modnamelen, 1890 struct mod_depend *verinfo) 1891 { 1892 char *cp, *ep, *result; 1893 1894 /* 1895 * traverse the linker path 1896 */ 1897 for (cp = linker_path; *cp; cp = ep + 1) { 1898 /* find the end of this component */ 1899 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1900 result = linker_hints_lookup(cp, ep - cp, modname, 1901 modnamelen, verinfo); 1902 if (result != NULL) 1903 return (result); 1904 if (*ep == 0) 1905 break; 1906 } 1907 return (NULL); 1908 } 1909 1910 /* 1911 * Search for module in all directories listed in the linker_path. 1912 */ 1913 static char * 1914 linker_search_kld(const char *name) 1915 { 1916 char *cp, *ep, *result; 1917 int len; 1918 1919 /* qualified at all? */ 1920 if (strchr(name, '/')) 1921 return (linker_strdup(name)); 1922 1923 /* traverse the linker path */ 1924 len = strlen(name); 1925 for (ep = linker_path; *ep; ep++) { 1926 cp = ep; 1927 /* find the end of this component */ 1928 for (; *ep != 0 && *ep != ';'; ep++); 1929 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 1930 if (result != NULL) 1931 return (result); 1932 } 1933 return (NULL); 1934 } 1935 1936 static const char * 1937 linker_basename(const char *path) 1938 { 1939 const char *filename; 1940 1941 filename = strrchr(path, '/'); 1942 if (filename == NULL) 1943 return path; 1944 if (filename[1]) 1945 filename++; 1946 return (filename); 1947 } 1948 1949 #ifdef HWPMC_HOOKS 1950 /* 1951 * Inform hwpmc about the set of kernel modules currently loaded. 1952 */ 1953 void * 1954 linker_hwpmc_list_objects(void) 1955 { 1956 linker_file_t lf; 1957 struct pmckern_map_in *kobase; 1958 int i, nmappings; 1959 1960 nmappings = 0; 1961 KLD_LOCK_READ(); 1962 TAILQ_FOREACH(lf, &linker_files, link) 1963 nmappings++; 1964 1965 /* Allocate nmappings + 1 entries. */ 1966 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 1967 M_LINKER, M_WAITOK | M_ZERO); 1968 i = 0; 1969 TAILQ_FOREACH(lf, &linker_files, link) { 1970 1971 /* Save the info for this linker file. */ 1972 kobase[i].pm_file = lf->filename; 1973 kobase[i].pm_address = (uintptr_t)lf->address; 1974 i++; 1975 } 1976 KLD_UNLOCK_READ(); 1977 1978 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 1979 1980 /* The last entry of the malloced area comprises of all zeros. */ 1981 KASSERT(kobase[i].pm_file == NULL, 1982 ("linker_hwpmc_list_objects: last object not NULL")); 1983 1984 return ((void *)kobase); 1985 } 1986 #endif 1987 1988 /* 1989 * Find a file which contains given module and load it, if "parent" is not 1990 * NULL, register a reference to it. 1991 */ 1992 static int 1993 linker_load_module(const char *kldname, const char *modname, 1994 struct linker_file *parent, struct mod_depend *verinfo, 1995 struct linker_file **lfpp) 1996 { 1997 linker_file_t lfdep; 1998 const char *filename; 1999 char *pathname; 2000 int error; 2001 2002 KLD_LOCK_ASSERT(); 2003 if (modname == NULL) { 2004 /* 2005 * We have to load KLD 2006 */ 2007 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 2008 " is not NULL")); 2009 pathname = linker_search_kld(kldname); 2010 } else { 2011 if (modlist_lookup2(modname, verinfo) != NULL) 2012 return (EEXIST); 2013 if (kldname != NULL) 2014 pathname = linker_strdup(kldname); 2015 else if (rootvnode == NULL) 2016 pathname = NULL; 2017 else 2018 /* 2019 * Need to find a KLD with required module 2020 */ 2021 pathname = linker_search_module(modname, 2022 strlen(modname), verinfo); 2023 } 2024 if (pathname == NULL) 2025 return (ENOENT); 2026 2027 /* 2028 * Can't load more than one file with the same basename XXX: 2029 * Actually it should be possible to have multiple KLDs with 2030 * the same basename but different path because they can 2031 * provide different versions of the same modules. 2032 */ 2033 filename = linker_basename(pathname); 2034 if (linker_find_file_by_name(filename)) 2035 error = EEXIST; 2036 else do { 2037 error = linker_load_file(pathname, &lfdep); 2038 if (error) 2039 break; 2040 if (modname && verinfo && 2041 modlist_lookup2(modname, verinfo) == NULL) { 2042 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2043 error = ENOENT; 2044 break; 2045 } 2046 if (parent) { 2047 error = linker_file_add_dependency(parent, lfdep); 2048 if (error) 2049 break; 2050 } 2051 if (lfpp) 2052 *lfpp = lfdep; 2053 } while (0); 2054 free(pathname, M_LINKER); 2055 return (error); 2056 } 2057 2058 /* 2059 * This routine is responsible for finding dependencies of userland initiated 2060 * kldload(2)'s of files. 2061 */ 2062 int 2063 linker_load_dependencies(linker_file_t lf) 2064 { 2065 linker_file_t lfdep; 2066 struct mod_metadata **start, **stop, **mdp, **nmdp; 2067 struct mod_metadata *mp, *nmp; 2068 struct mod_depend *verinfo; 2069 modlist_t mod; 2070 const char *modname, *nmodname; 2071 int ver, error = 0, count; 2072 2073 /* 2074 * All files are dependant on /kernel. 2075 */ 2076 KLD_LOCK_ASSERT(); 2077 if (linker_kernel_file) { 2078 linker_kernel_file->refs++; 2079 error = linker_file_add_dependency(lf, linker_kernel_file); 2080 if (error) 2081 return (error); 2082 } 2083 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2084 &count) != 0) 2085 return (0); 2086 for (mdp = start; mdp < stop; mdp++) { 2087 mp = *mdp; 2088 if (mp->md_type != MDT_VERSION) 2089 continue; 2090 modname = mp->md_cval; 2091 ver = ((struct mod_version *)mp->md_data)->mv_version; 2092 mod = modlist_lookup(modname, ver); 2093 if (mod != NULL) { 2094 printf("interface %s.%d already present in the KLD" 2095 " '%s'!\n", modname, ver, 2096 mod->container->filename); 2097 return (EEXIST); 2098 } 2099 } 2100 2101 for (mdp = start; mdp < stop; mdp++) { 2102 mp = *mdp; 2103 if (mp->md_type != MDT_DEPEND) 2104 continue; 2105 modname = mp->md_cval; 2106 verinfo = mp->md_data; 2107 nmodname = NULL; 2108 for (nmdp = start; nmdp < stop; nmdp++) { 2109 nmp = *nmdp; 2110 if (nmp->md_type != MDT_VERSION) 2111 continue; 2112 nmodname = nmp->md_cval; 2113 if (strcmp(modname, nmodname) == 0) 2114 break; 2115 } 2116 if (nmdp < stop)/* early exit, it's a self reference */ 2117 continue; 2118 mod = modlist_lookup2(modname, verinfo); 2119 if (mod) { /* woohoo, it's loaded already */ 2120 lfdep = mod->container; 2121 lfdep->refs++; 2122 error = linker_file_add_dependency(lf, lfdep); 2123 if (error) 2124 break; 2125 continue; 2126 } 2127 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2128 if (error) { 2129 printf("KLD %s: depends on %s - not available or" 2130 " version mismatch\n", lf->filename, modname); 2131 break; 2132 } 2133 } 2134 2135 if (error) 2136 return (error); 2137 linker_addmodules(lf, start, stop, 0); 2138 return (error); 2139 } 2140 2141 static int 2142 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2143 { 2144 struct sysctl_req *req; 2145 2146 req = opaque; 2147 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2148 } 2149 2150 /* 2151 * Export a nul-separated, double-nul-terminated list of all function names 2152 * in the kernel. 2153 */ 2154 static int 2155 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2156 { 2157 linker_file_t lf; 2158 int error; 2159 2160 #ifdef MAC 2161 error = mac_kld_check_stat(req->td->td_ucred); 2162 if (error) 2163 return (error); 2164 #endif 2165 error = sysctl_wire_old_buffer(req, 0); 2166 if (error != 0) 2167 return (error); 2168 KLD_LOCK(); 2169 TAILQ_FOREACH(lf, &linker_files, link) { 2170 error = LINKER_EACH_FUNCTION_NAME(lf, 2171 sysctl_kern_function_list_iterate, req); 2172 if (error) { 2173 KLD_UNLOCK(); 2174 return (error); 2175 } 2176 } 2177 KLD_UNLOCK(); 2178 return (SYSCTL_OUT(req, "", 1)); 2179 } 2180 2181 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD, 2182 NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 2183