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/fcntl.h> 49 #include <sys/jail.h> 50 #include <sys/libkern.h> 51 #include <sys/namei.h> 52 #include <sys/vnode.h> 53 #include <sys/syscallsubr.h> 54 #include <sys/sysctl.h> 55 56 #include <net/vnet.h> 57 58 #include <security/mac/mac_framework.h> 59 60 #include "linker_if.h" 61 62 #ifdef HWPMC_HOOKS 63 #include <sys/pmckern.h> 64 #endif 65 66 #ifdef KLD_DEBUG 67 int kld_debug = 0; 68 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RW | CTLFLAG_TUN, 69 &kld_debug, 0, "Set various levels of KLD debug"); 70 TUNABLE_INT("debug.kld_debug", &kld_debug); 71 #endif 72 73 #define KLD_LOCK() sx_xlock(&kld_sx) 74 #define KLD_UNLOCK() sx_xunlock(&kld_sx) 75 #define KLD_DOWNGRADE() sx_downgrade(&kld_sx) 76 #define KLD_LOCK_READ() sx_slock(&kld_sx) 77 #define KLD_UNLOCK_READ() sx_sunlock(&kld_sx) 78 #define KLD_LOCKED() sx_xlocked(&kld_sx) 79 #define KLD_LOCK_ASSERT() do { \ 80 if (!cold) \ 81 sx_assert(&kld_sx, SX_XLOCKED); \ 82 } while (0) 83 84 /* 85 * static char *linker_search_path(const char *name, struct mod_depend 86 * *verinfo); 87 */ 88 static const char *linker_basename(const char *path); 89 90 /* 91 * Find a currently loaded file given its filename. 92 */ 93 static linker_file_t linker_find_file_by_name(const char* _filename); 94 95 /* 96 * Find a currently loaded file given its file id. 97 */ 98 static linker_file_t linker_find_file_by_id(int _fileid); 99 100 /* Metadata from the static kernel */ 101 SET_DECLARE(modmetadata_set, struct mod_metadata); 102 103 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 104 105 linker_file_t linker_kernel_file; 106 107 static struct sx kld_sx; /* kernel linker lock */ 108 109 /* 110 * Load counter used by clients to determine if a linker file has been 111 * re-loaded. This counter is incremented for each file load. 112 */ 113 static int loadcnt; 114 115 static linker_class_list_t classes; 116 static linker_file_list_t linker_files; 117 static int next_file_id = 1; 118 static int linker_no_more_classes = 0; 119 120 #define LINKER_GET_NEXT_FILE_ID(a) do { \ 121 linker_file_t lftmp; \ 122 \ 123 KLD_LOCK_ASSERT(); \ 124 retry: \ 125 TAILQ_FOREACH(lftmp, &linker_files, link) { \ 126 if (next_file_id == lftmp->id) { \ 127 next_file_id++; \ 128 goto retry; \ 129 } \ 130 } \ 131 (a) = next_file_id; \ 132 } while(0) 133 134 135 /* XXX wrong name; we're looking at version provision tags here, not modules */ 136 typedef TAILQ_HEAD(, modlist) modlisthead_t; 137 struct modlist { 138 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 139 linker_file_t container; 140 const char *name; 141 int version; 142 }; 143 typedef struct modlist *modlist_t; 144 static modlisthead_t found_modules; 145 146 static int linker_file_add_dependency(linker_file_t file, 147 linker_file_t dep); 148 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file, 149 const char* name, int deps); 150 static int linker_load_module(const char *kldname, 151 const char *modname, struct linker_file *parent, 152 struct mod_depend *verinfo, struct linker_file **lfpp); 153 static modlist_t modlist_lookup2(const char *name, struct mod_depend *verinfo); 154 155 static char * 156 linker_strdup(const char *str) 157 { 158 char *result; 159 160 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 161 strcpy(result, str); 162 return (result); 163 } 164 165 static void 166 linker_init(void *arg) 167 { 168 169 sx_init(&kld_sx, "kernel linker"); 170 TAILQ_INIT(&classes); 171 TAILQ_INIT(&linker_files); 172 } 173 174 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0); 175 176 static void 177 linker_stop_class_add(void *arg) 178 { 179 180 linker_no_more_classes = 1; 181 } 182 183 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL); 184 185 int 186 linker_add_class(linker_class_t lc) 187 { 188 189 /* 190 * We disallow any class registration past SI_ORDER_ANY 191 * of SI_SUB_KLD. We bump the reference count to keep the 192 * ops from being freed. 193 */ 194 if (linker_no_more_classes == 1) 195 return (EPERM); 196 kobj_class_compile((kobj_class_t) lc); 197 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */ 198 TAILQ_INSERT_TAIL(&classes, lc, link); 199 return (0); 200 } 201 202 static void 203 linker_file_sysinit(linker_file_t lf) 204 { 205 struct sysinit **start, **stop, **sipp, **xipp, *save; 206 207 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 208 lf->filename)); 209 210 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 211 return; 212 /* 213 * Perform a bubble sort of the system initialization objects by 214 * their subsystem (primary key) and order (secondary key). 215 * 216 * Since some things care about execution order, this is the operation 217 * which ensures continued function. 218 */ 219 for (sipp = start; sipp < stop; sipp++) { 220 for (xipp = sipp + 1; xipp < stop; xipp++) { 221 if ((*sipp)->subsystem < (*xipp)->subsystem || 222 ((*sipp)->subsystem == (*xipp)->subsystem && 223 (*sipp)->order <= (*xipp)->order)) 224 continue; /* skip */ 225 save = *sipp; 226 *sipp = *xipp; 227 *xipp = save; 228 } 229 } 230 231 /* 232 * Traverse the (now) ordered list of system initialization tasks. 233 * Perform each task, and continue on to the next task. 234 */ 235 mtx_lock(&Giant); 236 for (sipp = start; sipp < stop; sipp++) { 237 if ((*sipp)->subsystem == SI_SUB_DUMMY) 238 continue; /* skip dummy task(s) */ 239 240 /* Call function */ 241 (*((*sipp)->func)) ((*sipp)->udata); 242 } 243 mtx_unlock(&Giant); 244 } 245 246 static void 247 linker_file_sysuninit(linker_file_t lf) 248 { 249 struct sysinit **start, **stop, **sipp, **xipp, *save; 250 251 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 252 lf->filename)); 253 254 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 255 NULL) != 0) 256 return; 257 258 /* 259 * Perform a reverse bubble sort of the system initialization objects 260 * by their subsystem (primary key) and order (secondary key). 261 * 262 * Since some things care about execution order, this is the operation 263 * which ensures continued function. 264 */ 265 for (sipp = start; sipp < stop; sipp++) { 266 for (xipp = sipp + 1; xipp < stop; xipp++) { 267 if ((*sipp)->subsystem > (*xipp)->subsystem || 268 ((*sipp)->subsystem == (*xipp)->subsystem && 269 (*sipp)->order >= (*xipp)->order)) 270 continue; /* skip */ 271 save = *sipp; 272 *sipp = *xipp; 273 *xipp = save; 274 } 275 } 276 277 /* 278 * Traverse the (now) ordered list of system initialization tasks. 279 * Perform each task, and continue on to the next task. 280 */ 281 mtx_lock(&Giant); 282 for (sipp = start; sipp < stop; sipp++) { 283 if ((*sipp)->subsystem == SI_SUB_DUMMY) 284 continue; /* skip dummy task(s) */ 285 286 /* Call function */ 287 (*((*sipp)->func)) ((*sipp)->udata); 288 } 289 mtx_unlock(&Giant); 290 } 291 292 static void 293 linker_file_register_sysctls(linker_file_t lf) 294 { 295 struct sysctl_oid **start, **stop, **oidp; 296 297 KLD_DPF(FILE, 298 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 299 lf->filename)); 300 301 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 302 return; 303 304 sysctl_lock(); 305 for (oidp = start; oidp < stop; oidp++) 306 sysctl_register_oid(*oidp); 307 sysctl_unlock(); 308 } 309 310 static void 311 linker_file_unregister_sysctls(linker_file_t lf) 312 { 313 struct sysctl_oid **start, **stop, **oidp; 314 315 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs" 316 " for %s\n", lf->filename)); 317 318 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 319 return; 320 321 sysctl_lock(); 322 for (oidp = start; oidp < stop; oidp++) 323 sysctl_unregister_oid(*oidp); 324 sysctl_unlock(); 325 } 326 327 static int 328 linker_file_register_modules(linker_file_t lf) 329 { 330 struct mod_metadata **start, **stop, **mdp; 331 const moduledata_t *moddata; 332 int first_error, error; 333 334 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 335 " in %s\n", lf->filename)); 336 337 if (linker_file_lookup_set(lf, "modmetadata_set", &start, 338 &stop, NULL) != 0) { 339 /* 340 * This fallback should be unnecessary, but if we get booted 341 * from boot2 instead of loader and we are missing our 342 * metadata then we have to try the best we can. 343 */ 344 if (lf == linker_kernel_file) { 345 start = SET_BEGIN(modmetadata_set); 346 stop = SET_LIMIT(modmetadata_set); 347 } else 348 return (0); 349 } 350 first_error = 0; 351 for (mdp = start; mdp < stop; mdp++) { 352 if ((*mdp)->md_type != MDT_MODULE) 353 continue; 354 moddata = (*mdp)->md_data; 355 KLD_DPF(FILE, ("Registering module %s in %s\n", 356 moddata->name, lf->filename)); 357 error = module_register(moddata, lf); 358 if (error) { 359 printf("Module %s failed to register: %d\n", 360 moddata->name, error); 361 if (first_error == 0) 362 first_error = error; 363 } 364 } 365 return (first_error); 366 } 367 368 static void 369 linker_init_kernel_modules(void) 370 { 371 372 linker_file_register_modules(linker_kernel_file); 373 } 374 375 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 376 0); 377 378 static int 379 linker_load_file(const char *filename, linker_file_t *result) 380 { 381 linker_class_t lc; 382 linker_file_t lf; 383 int foundfile, error, modules; 384 385 /* Refuse to load modules if securelevel raised */ 386 if (prison0.pr_securelevel > 0) 387 return (EPERM); 388 389 KLD_LOCK_ASSERT(); 390 lf = linker_find_file_by_name(filename); 391 if (lf) { 392 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 393 " incrementing refs\n", filename)); 394 *result = lf; 395 lf->refs++; 396 return (0); 397 } 398 foundfile = 0; 399 error = 0; 400 401 /* 402 * We do not need to protect (lock) classes here because there is 403 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 404 * and there is no class deregistration mechanism at this time. 405 */ 406 TAILQ_FOREACH(lc, &classes, link) { 407 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 408 filename)); 409 error = LINKER_LOAD_FILE(lc, filename, &lf); 410 /* 411 * If we got something other than ENOENT, then it exists but 412 * we cannot load it for some other reason. 413 */ 414 if (error != ENOENT) 415 foundfile = 1; 416 if (lf) { 417 error = linker_file_register_modules(lf); 418 if (error == EEXIST) { 419 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 420 return (error); 421 } 422 modules = !TAILQ_EMPTY(&lf->modules); 423 KLD_UNLOCK(); 424 linker_file_register_sysctls(lf); 425 linker_file_sysinit(lf); 426 KLD_LOCK(); 427 lf->flags |= LINKER_FILE_LINKED; 428 429 /* 430 * If all of the modules in this file failed 431 * to load, unload the file and return an 432 * error of ENOEXEC. 433 */ 434 if (modules && TAILQ_EMPTY(&lf->modules)) { 435 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 436 return (ENOEXEC); 437 } 438 *result = lf; 439 return (0); 440 } 441 } 442 /* 443 * Less than ideal, but tells the user whether it failed to load or 444 * the module was not found. 445 */ 446 if (foundfile) { 447 448 /* 449 * If the file type has not been recognized by the last try 450 * printout a message before to fail. 451 */ 452 if (error == ENOSYS) 453 printf("linker_load_file: Unsupported file type\n"); 454 455 /* 456 * Format not recognized or otherwise unloadable. 457 * When loading a module that is statically built into 458 * the kernel EEXIST percolates back up as the return 459 * value. Preserve this so that apps like sysinstall 460 * can recognize this special case and not post bogus 461 * dialog boxes. 462 */ 463 if (error != EEXIST) 464 error = ENOEXEC; 465 } else 466 error = ENOENT; /* Nothing found */ 467 return (error); 468 } 469 470 int 471 linker_reference_module(const char *modname, struct mod_depend *verinfo, 472 linker_file_t *result) 473 { 474 modlist_t mod; 475 int error; 476 477 KLD_LOCK(); 478 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 479 *result = mod->container; 480 (*result)->refs++; 481 KLD_UNLOCK(); 482 return (0); 483 } 484 485 error = linker_load_module(NULL, modname, NULL, verinfo, result); 486 KLD_UNLOCK(); 487 return (error); 488 } 489 490 int 491 linker_release_module(const char *modname, struct mod_depend *verinfo, 492 linker_file_t lf) 493 { 494 modlist_t mod; 495 int error; 496 497 KLD_LOCK(); 498 if (lf == NULL) { 499 KASSERT(modname != NULL, 500 ("linker_release_module: no file or name")); 501 mod = modlist_lookup2(modname, verinfo); 502 if (mod == NULL) { 503 KLD_UNLOCK(); 504 return (ESRCH); 505 } 506 lf = mod->container; 507 } else 508 KASSERT(modname == NULL && verinfo == NULL, 509 ("linker_release_module: both file and name")); 510 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL); 511 KLD_UNLOCK(); 512 return (error); 513 } 514 515 static linker_file_t 516 linker_find_file_by_name(const char *filename) 517 { 518 linker_file_t lf; 519 char *koname; 520 521 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 522 sprintf(koname, "%s.ko", filename); 523 524 KLD_LOCK_ASSERT(); 525 TAILQ_FOREACH(lf, &linker_files, link) { 526 if (strcmp(lf->filename, koname) == 0) 527 break; 528 if (strcmp(lf->filename, filename) == 0) 529 break; 530 } 531 free(koname, M_LINKER); 532 return (lf); 533 } 534 535 static linker_file_t 536 linker_find_file_by_id(int fileid) 537 { 538 linker_file_t lf; 539 540 KLD_LOCK_ASSERT(); 541 TAILQ_FOREACH(lf, &linker_files, link) 542 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED) 543 break; 544 return (lf); 545 } 546 547 int 548 linker_file_foreach(linker_predicate_t *predicate, void *context) 549 { 550 linker_file_t lf; 551 int retval = 0; 552 553 KLD_LOCK(); 554 TAILQ_FOREACH(lf, &linker_files, link) { 555 retval = predicate(lf, context); 556 if (retval != 0) 557 break; 558 } 559 KLD_UNLOCK(); 560 return (retval); 561 } 562 563 linker_file_t 564 linker_make_file(const char *pathname, linker_class_t lc) 565 { 566 linker_file_t lf; 567 const char *filename; 568 569 KLD_LOCK_ASSERT(); 570 filename = linker_basename(pathname); 571 572 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname)); 573 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 574 if (lf == NULL) 575 return (NULL); 576 lf->refs = 1; 577 lf->userrefs = 0; 578 lf->flags = 0; 579 lf->filename = linker_strdup(filename); 580 lf->pathname = linker_strdup(pathname); 581 LINKER_GET_NEXT_FILE_ID(lf->id); 582 lf->ndeps = 0; 583 lf->deps = NULL; 584 lf->loadcnt = ++loadcnt; 585 lf->sdt_probes = NULL; 586 lf->sdt_nprobes = 0; 587 STAILQ_INIT(&lf->common); 588 TAILQ_INIT(&lf->modules); 589 TAILQ_INSERT_TAIL(&linker_files, lf, link); 590 return (lf); 591 } 592 593 int 594 linker_file_unload(linker_file_t file, int flags) 595 { 596 module_t mod, next; 597 modlist_t ml, nextml; 598 struct common_symbol *cp; 599 int error, i; 600 601 /* Refuse to unload modules if securelevel raised. */ 602 if (prison0.pr_securelevel > 0) 603 return (EPERM); 604 605 KLD_LOCK_ASSERT(); 606 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 607 608 /* Easy case of just dropping a reference. */ 609 if (file->refs > 1) { 610 file->refs--; 611 return (0); 612 } 613 614 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 615 " informing modules\n")); 616 617 /* 618 * Quiesce all the modules to give them a chance to veto the unload. 619 */ 620 MOD_SLOCK; 621 for (mod = TAILQ_FIRST(&file->modules); mod; 622 mod = module_getfnext(mod)) { 623 624 error = module_quiesce(mod); 625 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 626 KLD_DPF(FILE, ("linker_file_unload: module %s" 627 " vetoed unload\n", module_getname(mod))); 628 /* 629 * XXX: Do we need to tell all the quiesced modules 630 * that they can resume work now via a new module 631 * event? 632 */ 633 MOD_SUNLOCK; 634 return (error); 635 } 636 } 637 MOD_SUNLOCK; 638 639 /* 640 * Inform any modules associated with this file that they are 641 * being unloaded. 642 */ 643 MOD_XLOCK; 644 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 645 next = module_getfnext(mod); 646 MOD_XUNLOCK; 647 648 /* 649 * Give the module a chance to veto the unload. 650 */ 651 if ((error = module_unload(mod)) != 0) { 652 #ifdef KLD_DEBUG 653 MOD_SLOCK; 654 KLD_DPF(FILE, ("linker_file_unload: module %s" 655 " failed unload\n", module_getname(mod))); 656 MOD_SUNLOCK; 657 #endif 658 return (error); 659 } 660 MOD_XLOCK; 661 module_release(mod); 662 } 663 MOD_XUNLOCK; 664 665 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 666 if (ml->container == file) { 667 TAILQ_REMOVE(&found_modules, ml, link); 668 free(ml, M_LINKER); 669 } 670 } 671 672 /* 673 * Don't try to run SYSUNINITs if we are unloaded due to a 674 * link error. 675 */ 676 if (file->flags & LINKER_FILE_LINKED) { 677 file->flags &= ~LINKER_FILE_LINKED; 678 KLD_UNLOCK(); 679 linker_file_sysuninit(file); 680 linker_file_unregister_sysctls(file); 681 KLD_LOCK(); 682 } 683 TAILQ_REMOVE(&linker_files, file, link); 684 685 if (file->deps) { 686 for (i = 0; i < file->ndeps; i++) 687 linker_file_unload(file->deps[i], flags); 688 free(file->deps, M_LINKER); 689 file->deps = NULL; 690 } 691 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 692 STAILQ_REMOVE_HEAD(&file->common, link); 693 free(cp, M_LINKER); 694 } 695 696 LINKER_UNLOAD(file); 697 if (file->filename) { 698 free(file->filename, M_LINKER); 699 file->filename = NULL; 700 } 701 if (file->pathname) { 702 free(file->pathname, M_LINKER); 703 file->pathname = NULL; 704 } 705 kobj_delete((kobj_t) file, M_LINKER); 706 return (0); 707 } 708 709 int 710 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 711 { 712 return (LINKER_CTF_GET(file, lc)); 713 } 714 715 static int 716 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 717 { 718 linker_file_t *newdeps; 719 720 KLD_LOCK_ASSERT(); 721 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 722 M_LINKER, M_WAITOK | M_ZERO); 723 if (newdeps == NULL) 724 return (ENOMEM); 725 726 if (file->deps) { 727 bcopy(file->deps, newdeps, 728 file->ndeps * sizeof(linker_file_t *)); 729 free(file->deps, M_LINKER); 730 } 731 file->deps = newdeps; 732 file->deps[file->ndeps] = dep; 733 file->ndeps++; 734 KLD_DPF(FILE, ("linker_file_add_dependency:" 735 " adding %s as dependency for %s\n", 736 dep->filename, file->filename)); 737 return (0); 738 } 739 740 /* 741 * Locate a linker set and its contents. This is a helper function to avoid 742 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 743 * This function is used in this file so we can avoid having lots of (void **) 744 * casts. 745 */ 746 int 747 linker_file_lookup_set(linker_file_t file, const char *name, 748 void *firstp, void *lastp, int *countp) 749 { 750 int error, locked; 751 752 locked = KLD_LOCKED(); 753 if (!locked) 754 KLD_LOCK(); 755 error = LINKER_LOOKUP_SET(file, name, firstp, lastp, countp); 756 if (!locked) 757 KLD_UNLOCK(); 758 return (error); 759 } 760 761 /* 762 * List all functions in a file. 763 */ 764 int 765 linker_file_function_listall(linker_file_t lf, 766 linker_function_nameval_callback_t callback_func, void *arg) 767 { 768 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 769 } 770 771 caddr_t 772 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 773 { 774 caddr_t sym; 775 int locked; 776 777 locked = KLD_LOCKED(); 778 if (!locked) 779 KLD_LOCK(); 780 sym = linker_file_lookup_symbol_internal(file, name, deps); 781 if (!locked) 782 KLD_UNLOCK(); 783 return (sym); 784 } 785 786 static caddr_t 787 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 788 int deps) 789 { 790 c_linker_sym_t sym; 791 linker_symval_t symval; 792 caddr_t address; 793 size_t common_size = 0; 794 int i; 795 796 KLD_LOCK_ASSERT(); 797 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 798 file, name, deps)); 799 800 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 801 LINKER_SYMBOL_VALUES(file, sym, &symval); 802 if (symval.value == 0) 803 /* 804 * For commons, first look them up in the 805 * dependencies and only allocate space if not found 806 * there. 807 */ 808 common_size = symval.size; 809 else { 810 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 811 ".value=%p\n", symval.value)); 812 return (symval.value); 813 } 814 } 815 if (deps) { 816 for (i = 0; i < file->ndeps; i++) { 817 address = linker_file_lookup_symbol_internal( 818 file->deps[i], name, 0); 819 if (address) { 820 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 821 " deps value=%p\n", address)); 822 return (address); 823 } 824 } 825 } 826 if (common_size > 0) { 827 /* 828 * This is a common symbol which was not found in the 829 * dependencies. We maintain a simple common symbol table in 830 * the file object. 831 */ 832 struct common_symbol *cp; 833 834 STAILQ_FOREACH(cp, &file->common, link) { 835 if (strcmp(cp->name, name) == 0) { 836 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 837 " old common value=%p\n", cp->address)); 838 return (cp->address); 839 } 840 } 841 /* 842 * Round the symbol size up to align. 843 */ 844 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 845 cp = malloc(sizeof(struct common_symbol) 846 + common_size + strlen(name) + 1, M_LINKER, 847 M_WAITOK | M_ZERO); 848 cp->address = (caddr_t)(cp + 1); 849 cp->name = cp->address + common_size; 850 strcpy(cp->name, name); 851 bzero(cp->address, common_size); 852 STAILQ_INSERT_TAIL(&file->common, cp, link); 853 854 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 855 " value=%p\n", cp->address)); 856 return (cp->address); 857 } 858 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 859 return (0); 860 } 861 862 /* 863 * Both DDB and stack(9) rely on the kernel linker to provide forward and 864 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 865 * do this in a lockfree manner. We provide a set of internal helper 866 * routines to perform these operations without locks, and then wrappers that 867 * optionally lock. 868 * 869 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 870 */ 871 #ifdef DDB 872 static int 873 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 874 { 875 linker_file_t lf; 876 877 TAILQ_FOREACH(lf, &linker_files, link) { 878 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 879 return (0); 880 } 881 return (ENOENT); 882 } 883 #endif 884 885 static int 886 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 887 { 888 linker_file_t lf; 889 c_linker_sym_t best, es; 890 u_long diff, bestdiff, off; 891 892 best = 0; 893 off = (uintptr_t)value; 894 bestdiff = off; 895 TAILQ_FOREACH(lf, &linker_files, link) { 896 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 897 continue; 898 if (es != 0 && diff < bestdiff) { 899 best = es; 900 bestdiff = diff; 901 } 902 if (bestdiff == 0) 903 break; 904 } 905 if (best) { 906 *sym = best; 907 *diffp = bestdiff; 908 return (0); 909 } else { 910 *sym = 0; 911 *diffp = off; 912 return (ENOENT); 913 } 914 } 915 916 static int 917 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 918 { 919 linker_file_t lf; 920 921 TAILQ_FOREACH(lf, &linker_files, link) { 922 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 923 return (0); 924 } 925 return (ENOENT); 926 } 927 928 static int 929 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 930 long *offset) 931 { 932 linker_symval_t symval; 933 c_linker_sym_t sym; 934 int error; 935 936 *offset = 0; 937 error = linker_debug_search_symbol(value, &sym, offset); 938 if (error) 939 return (error); 940 error = linker_debug_symbol_values(sym, &symval); 941 if (error) 942 return (error); 943 strlcpy(buf, symval.name, buflen); 944 return (0); 945 } 946 947 /* 948 * DDB Helpers. DDB has to look across multiple files with their own symbol 949 * tables and string tables. 950 * 951 * Note that we do not obey list locking protocols here. We really don't need 952 * DDB to hang because somebody's got the lock held. We'll take the chance 953 * that the files list is inconsistant instead. 954 */ 955 #ifdef DDB 956 int 957 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 958 { 959 960 return (linker_debug_lookup(symstr, sym)); 961 } 962 #endif 963 964 int 965 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 966 { 967 968 return (linker_debug_search_symbol(value, sym, diffp)); 969 } 970 971 int 972 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 973 { 974 975 return (linker_debug_symbol_values(sym, symval)); 976 } 977 978 int 979 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 980 long *offset) 981 { 982 983 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 984 } 985 986 /* 987 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 988 * obey locking protocols, and offer a significantly less complex interface. 989 */ 990 int 991 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 992 long *offset) 993 { 994 int error; 995 996 KLD_LOCK(); 997 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 998 KLD_UNLOCK(); 999 return (error); 1000 } 1001 1002 /* 1003 * Syscalls. 1004 */ 1005 int 1006 kern_kldload(struct thread *td, const char *file, int *fileid) 1007 { 1008 #ifdef HWPMC_HOOKS 1009 struct pmckern_map_in pkm; 1010 #endif 1011 const char *kldname, *modname; 1012 linker_file_t lf; 1013 int error; 1014 1015 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1016 return (error); 1017 1018 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1019 return (error); 1020 1021 /* 1022 * It is possible that kldloaded module will attach a new ifnet, 1023 * so vnet context must be set when this ocurs. 1024 */ 1025 CURVNET_SET(TD_TO_VNET(td)); 1026 1027 /* 1028 * If file does not contain a qualified name or any dot in it 1029 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1030 * name. 1031 */ 1032 if (strchr(file, '/') || strchr(file, '.')) { 1033 kldname = file; 1034 modname = NULL; 1035 } else { 1036 kldname = NULL; 1037 modname = file; 1038 } 1039 1040 KLD_LOCK(); 1041 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1042 if (error) { 1043 KLD_UNLOCK(); 1044 goto done; 1045 } 1046 lf->userrefs++; 1047 if (fileid != NULL) 1048 *fileid = lf->id; 1049 #ifdef HWPMC_HOOKS 1050 KLD_DOWNGRADE(); 1051 pkm.pm_file = lf->filename; 1052 pkm.pm_address = (uintptr_t) lf->address; 1053 PMC_CALL_HOOK(td, PMC_FN_KLD_LOAD, (void *) &pkm); 1054 KLD_UNLOCK_READ(); 1055 #else 1056 KLD_UNLOCK(); 1057 #endif 1058 1059 done: 1060 CURVNET_RESTORE(); 1061 return (error); 1062 } 1063 1064 int 1065 sys_kldload(struct thread *td, struct kldload_args *uap) 1066 { 1067 char *pathname = NULL; 1068 int error, fileid; 1069 1070 td->td_retval[0] = -1; 1071 1072 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1073 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1074 if (error == 0) { 1075 error = kern_kldload(td, pathname, &fileid); 1076 if (error == 0) 1077 td->td_retval[0] = fileid; 1078 } 1079 free(pathname, M_TEMP); 1080 return (error); 1081 } 1082 1083 int 1084 kern_kldunload(struct thread *td, int fileid, int flags) 1085 { 1086 #ifdef HWPMC_HOOKS 1087 struct pmckern_map_out pkm; 1088 #endif 1089 linker_file_t lf; 1090 int error = 0; 1091 1092 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1093 return (error); 1094 1095 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1096 return (error); 1097 1098 CURVNET_SET(TD_TO_VNET(td)); 1099 KLD_LOCK(); 1100 lf = linker_find_file_by_id(fileid); 1101 if (lf) { 1102 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1103 1104 /* Check if there are DTrace probes enabled on this file. */ 1105 if (lf->nenabled > 0) { 1106 printf("kldunload: attempt to unload file that has" 1107 " DTrace probes enabled\n"); 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