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 lf->sdt_probes = NULL; 587 lf->sdt_nprobes = 0; 588 STAILQ_INIT(&lf->common); 589 TAILQ_INIT(&lf->modules); 590 TAILQ_INSERT_TAIL(&linker_files, lf, link); 591 return (lf); 592 } 593 594 int 595 linker_file_unload(linker_file_t file, int flags) 596 { 597 module_t mod, next; 598 modlist_t ml, nextml; 599 struct common_symbol *cp; 600 int error, i; 601 602 /* Refuse to unload modules if securelevel raised. */ 603 if (prison0.pr_securelevel > 0) 604 return (EPERM); 605 606 KLD_LOCK_ASSERT(); 607 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 608 609 /* Easy case of just dropping a reference. */ 610 if (file->refs > 1) { 611 file->refs--; 612 return (0); 613 } 614 615 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 616 " informing modules\n")); 617 618 /* 619 * Quiesce all the modules to give them a chance to veto the unload. 620 */ 621 MOD_SLOCK; 622 for (mod = TAILQ_FIRST(&file->modules); mod; 623 mod = module_getfnext(mod)) { 624 625 error = module_quiesce(mod); 626 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 627 KLD_DPF(FILE, ("linker_file_unload: module %s" 628 " vetoed unload\n", module_getname(mod))); 629 /* 630 * XXX: Do we need to tell all the quiesced modules 631 * that they can resume work now via a new module 632 * event? 633 */ 634 MOD_SUNLOCK; 635 return (error); 636 } 637 } 638 MOD_SUNLOCK; 639 640 /* 641 * Inform any modules associated with this file that they are 642 * being unloaded. 643 */ 644 MOD_XLOCK; 645 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 646 next = module_getfnext(mod); 647 MOD_XUNLOCK; 648 649 /* 650 * Give the module a chance to veto the unload. 651 */ 652 if ((error = module_unload(mod)) != 0) { 653 #ifdef KLD_DEBUG 654 MOD_SLOCK; 655 KLD_DPF(FILE, ("linker_file_unload: module %s" 656 " failed unload\n", module_getname(mod))); 657 MOD_SUNLOCK; 658 #endif 659 return (error); 660 } 661 MOD_XLOCK; 662 module_release(mod); 663 } 664 MOD_XUNLOCK; 665 666 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 667 if (ml->container == file) { 668 TAILQ_REMOVE(&found_modules, ml, link); 669 free(ml, M_LINKER); 670 } 671 } 672 673 /* 674 * Don't try to run SYSUNINITs if we are unloaded due to a 675 * link error. 676 */ 677 if (file->flags & LINKER_FILE_LINKED) { 678 file->flags &= ~LINKER_FILE_LINKED; 679 KLD_UNLOCK(); 680 linker_file_sysuninit(file); 681 linker_file_unregister_sysctls(file); 682 KLD_LOCK(); 683 } 684 TAILQ_REMOVE(&linker_files, file, link); 685 686 if (file->deps) { 687 for (i = 0; i < file->ndeps; i++) 688 linker_file_unload(file->deps[i], flags); 689 free(file->deps, M_LINKER); 690 file->deps = NULL; 691 } 692 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 693 STAILQ_REMOVE_HEAD(&file->common, link); 694 free(cp, M_LINKER); 695 } 696 697 LINKER_UNLOAD(file); 698 if (file->filename) { 699 free(file->filename, M_LINKER); 700 file->filename = NULL; 701 } 702 if (file->pathname) { 703 free(file->pathname, M_LINKER); 704 file->pathname = NULL; 705 } 706 kobj_delete((kobj_t) file, M_LINKER); 707 return (0); 708 } 709 710 int 711 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 712 { 713 return (LINKER_CTF_GET(file, lc)); 714 } 715 716 static int 717 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 718 { 719 linker_file_t *newdeps; 720 721 KLD_LOCK_ASSERT(); 722 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 723 M_LINKER, M_WAITOK | M_ZERO); 724 if (newdeps == NULL) 725 return (ENOMEM); 726 727 if (file->deps) { 728 bcopy(file->deps, newdeps, 729 file->ndeps * sizeof(linker_file_t *)); 730 free(file->deps, M_LINKER); 731 } 732 file->deps = newdeps; 733 file->deps[file->ndeps] = dep; 734 file->ndeps++; 735 KLD_DPF(FILE, ("linker_file_add_dependency:" 736 " adding %s as dependency for %s\n", 737 dep->filename, file->filename)); 738 return (0); 739 } 740 741 /* 742 * Locate a linker set and its contents. This is a helper function to avoid 743 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 744 * This function is used in this file so we can avoid having lots of (void **) 745 * casts. 746 */ 747 int 748 linker_file_lookup_set(linker_file_t file, const char *name, 749 void *firstp, void *lastp, int *countp) 750 { 751 int error, locked; 752 753 locked = KLD_LOCKED(); 754 if (!locked) 755 KLD_LOCK(); 756 error = LINKER_LOOKUP_SET(file, name, firstp, lastp, countp); 757 if (!locked) 758 KLD_UNLOCK(); 759 return (error); 760 } 761 762 /* 763 * List all functions in a file. 764 */ 765 int 766 linker_file_function_listall(linker_file_t lf, 767 linker_function_nameval_callback_t callback_func, void *arg) 768 { 769 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 770 } 771 772 caddr_t 773 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 774 { 775 caddr_t sym; 776 int locked; 777 778 locked = KLD_LOCKED(); 779 if (!locked) 780 KLD_LOCK(); 781 sym = linker_file_lookup_symbol_internal(file, name, deps); 782 if (!locked) 783 KLD_UNLOCK(); 784 return (sym); 785 } 786 787 static caddr_t 788 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 789 int deps) 790 { 791 c_linker_sym_t sym; 792 linker_symval_t symval; 793 caddr_t address; 794 size_t common_size = 0; 795 int i; 796 797 KLD_LOCK_ASSERT(); 798 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 799 file, name, deps)); 800 801 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 802 LINKER_SYMBOL_VALUES(file, sym, &symval); 803 if (symval.value == 0) 804 /* 805 * For commons, first look them up in the 806 * dependencies and only allocate space if not found 807 * there. 808 */ 809 common_size = symval.size; 810 else { 811 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 812 ".value=%p\n", symval.value)); 813 return (symval.value); 814 } 815 } 816 if (deps) { 817 for (i = 0; i < file->ndeps; i++) { 818 address = linker_file_lookup_symbol_internal( 819 file->deps[i], name, 0); 820 if (address) { 821 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 822 " deps value=%p\n", address)); 823 return (address); 824 } 825 } 826 } 827 if (common_size > 0) { 828 /* 829 * This is a common symbol which was not found in the 830 * dependencies. We maintain a simple common symbol table in 831 * the file object. 832 */ 833 struct common_symbol *cp; 834 835 STAILQ_FOREACH(cp, &file->common, link) { 836 if (strcmp(cp->name, name) == 0) { 837 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 838 " old common value=%p\n", cp->address)); 839 return (cp->address); 840 } 841 } 842 /* 843 * Round the symbol size up to align. 844 */ 845 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 846 cp = malloc(sizeof(struct common_symbol) 847 + common_size + strlen(name) + 1, M_LINKER, 848 M_WAITOK | M_ZERO); 849 cp->address = (caddr_t)(cp + 1); 850 cp->name = cp->address + common_size; 851 strcpy(cp->name, name); 852 bzero(cp->address, common_size); 853 STAILQ_INSERT_TAIL(&file->common, cp, link); 854 855 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 856 " value=%p\n", cp->address)); 857 return (cp->address); 858 } 859 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 860 return (0); 861 } 862 863 /* 864 * Both DDB and stack(9) rely on the kernel linker to provide forward and 865 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 866 * do this in a lockfree manner. We provide a set of internal helper 867 * routines to perform these operations without locks, and then wrappers that 868 * optionally lock. 869 * 870 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 871 */ 872 #ifdef DDB 873 static int 874 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 875 { 876 linker_file_t lf; 877 878 TAILQ_FOREACH(lf, &linker_files, link) { 879 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 880 return (0); 881 } 882 return (ENOENT); 883 } 884 #endif 885 886 static int 887 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 888 { 889 linker_file_t lf; 890 c_linker_sym_t best, es; 891 u_long diff, bestdiff, off; 892 893 best = 0; 894 off = (uintptr_t)value; 895 bestdiff = off; 896 TAILQ_FOREACH(lf, &linker_files, link) { 897 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 898 continue; 899 if (es != 0 && diff < bestdiff) { 900 best = es; 901 bestdiff = diff; 902 } 903 if (bestdiff == 0) 904 break; 905 } 906 if (best) { 907 *sym = best; 908 *diffp = bestdiff; 909 return (0); 910 } else { 911 *sym = 0; 912 *diffp = off; 913 return (ENOENT); 914 } 915 } 916 917 static int 918 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 919 { 920 linker_file_t lf; 921 922 TAILQ_FOREACH(lf, &linker_files, link) { 923 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 924 return (0); 925 } 926 return (ENOENT); 927 } 928 929 static int 930 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 931 long *offset) 932 { 933 linker_symval_t symval; 934 c_linker_sym_t sym; 935 int error; 936 937 *offset = 0; 938 error = linker_debug_search_symbol(value, &sym, offset); 939 if (error) 940 return (error); 941 error = linker_debug_symbol_values(sym, &symval); 942 if (error) 943 return (error); 944 strlcpy(buf, symval.name, buflen); 945 return (0); 946 } 947 948 /* 949 * DDB Helpers. DDB has to look across multiple files with their own symbol 950 * tables and string tables. 951 * 952 * Note that we do not obey list locking protocols here. We really don't need 953 * DDB to hang because somebody's got the lock held. We'll take the chance 954 * that the files list is inconsistant instead. 955 */ 956 #ifdef DDB 957 int 958 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 959 { 960 961 return (linker_debug_lookup(symstr, sym)); 962 } 963 #endif 964 965 int 966 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 967 { 968 969 return (linker_debug_search_symbol(value, sym, diffp)); 970 } 971 972 int 973 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 974 { 975 976 return (linker_debug_symbol_values(sym, symval)); 977 } 978 979 int 980 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 981 long *offset) 982 { 983 984 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 985 } 986 987 /* 988 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 989 * obey locking protocols, and offer a significantly less complex interface. 990 */ 991 int 992 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 993 long *offset) 994 { 995 int error; 996 997 KLD_LOCK(); 998 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 999 KLD_UNLOCK(); 1000 return (error); 1001 } 1002 1003 /* 1004 * Syscalls. 1005 */ 1006 int 1007 kern_kldload(struct thread *td, const char *file, int *fileid) 1008 { 1009 #ifdef HWPMC_HOOKS 1010 struct pmckern_map_in pkm; 1011 #endif 1012 const char *kldname, *modname; 1013 linker_file_t lf; 1014 int error; 1015 1016 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1017 return (error); 1018 1019 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1020 return (error); 1021 1022 /* 1023 * It is possible that kldloaded module will attach a new ifnet, 1024 * so vnet context must be set when this ocurs. 1025 */ 1026 CURVNET_SET(TD_TO_VNET(td)); 1027 1028 /* 1029 * If file does not contain a qualified name or any dot in it 1030 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1031 * name. 1032 */ 1033 if (strchr(file, '/') || strchr(file, '.')) { 1034 kldname = file; 1035 modname = NULL; 1036 } else { 1037 kldname = NULL; 1038 modname = file; 1039 } 1040 1041 KLD_LOCK(); 1042 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1043 if (error) { 1044 KLD_UNLOCK(); 1045 goto done; 1046 } 1047 lf->userrefs++; 1048 if (fileid != NULL) 1049 *fileid = lf->id; 1050 1051 EVENTHANDLER_INVOKE(mod_load, lf); 1052 1053 #ifdef HWPMC_HOOKS 1054 KLD_DOWNGRADE(); 1055 pkm.pm_file = lf->filename; 1056 pkm.pm_address = (uintptr_t) lf->address; 1057 PMC_CALL_HOOK(td, PMC_FN_KLD_LOAD, (void *) &pkm); 1058 KLD_UNLOCK_READ(); 1059 #else 1060 KLD_UNLOCK(); 1061 #endif 1062 1063 done: 1064 CURVNET_RESTORE(); 1065 return (error); 1066 } 1067 1068 int 1069 sys_kldload(struct thread *td, struct kldload_args *uap) 1070 { 1071 char *pathname = NULL; 1072 int error, fileid; 1073 1074 td->td_retval[0] = -1; 1075 1076 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1077 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1078 if (error == 0) { 1079 error = kern_kldload(td, pathname, &fileid); 1080 if (error == 0) 1081 td->td_retval[0] = fileid; 1082 } 1083 free(pathname, M_TEMP); 1084 return (error); 1085 } 1086 1087 int 1088 kern_kldunload(struct thread *td, int fileid, int flags) 1089 { 1090 #ifdef HWPMC_HOOKS 1091 struct pmckern_map_out pkm; 1092 #endif 1093 linker_file_t lf; 1094 int error = 0; 1095 1096 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1097 return (error); 1098 1099 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1100 return (error); 1101 1102 CURVNET_SET(TD_TO_VNET(td)); 1103 KLD_LOCK(); 1104 lf = linker_find_file_by_id(fileid); 1105 if (lf) { 1106 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1107 1108 EVENTHANDLER_INVOKE(mod_unload, lf, &error); 1109 if (error != 0) 1110 error = EBUSY; 1111 else if (lf->nenabled > 0) { 1112 printf("kldunload: attempt to unload file that has" 1113 " DTrace probes enabled\n"); 1114 error = EBUSY; 1115 } else if (lf->userrefs == 0) { 1116 /* 1117 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1118 */ 1119 printf("kldunload: attempt to unload file that was" 1120 " loaded by the kernel\n"); 1121 error = EBUSY; 1122 } else { 1123 #ifdef HWPMC_HOOKS 1124 /* Save data needed by hwpmc(4) before unloading. */ 1125 pkm.pm_address = (uintptr_t) lf->address; 1126 pkm.pm_size = lf->size; 1127 #endif 1128 lf->userrefs--; 1129 error = linker_file_unload(lf, flags); 1130 if (error) 1131 lf->userrefs++; 1132 } 1133 } else 1134 error = ENOENT; 1135 1136 #ifdef HWPMC_HOOKS 1137 if (error == 0) { 1138 KLD_DOWNGRADE(); 1139 PMC_CALL_HOOK(td, PMC_FN_KLD_UNLOAD, (void *) &pkm); 1140 KLD_UNLOCK_READ(); 1141 } else 1142 KLD_UNLOCK(); 1143 #else 1144 KLD_UNLOCK(); 1145 #endif 1146 CURVNET_RESTORE(); 1147 return (error); 1148 } 1149 1150 int 1151 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1152 { 1153 1154 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1155 } 1156 1157 int 1158 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1159 { 1160 1161 if (uap->flags != LINKER_UNLOAD_NORMAL && 1162 uap->flags != LINKER_UNLOAD_FORCE) 1163 return (EINVAL); 1164 return (kern_kldunload(td, uap->fileid, uap->flags)); 1165 } 1166 1167 int 1168 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1169 { 1170 char *pathname; 1171 const char *filename; 1172 linker_file_t lf; 1173 int error; 1174 1175 #ifdef MAC 1176 error = mac_kld_check_stat(td->td_ucred); 1177 if (error) 1178 return (error); 1179 #endif 1180 1181 td->td_retval[0] = -1; 1182 1183 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1184 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1185 goto out; 1186 1187 filename = linker_basename(pathname); 1188 KLD_LOCK(); 1189 lf = linker_find_file_by_name(filename); 1190 if (lf) 1191 td->td_retval[0] = lf->id; 1192 else 1193 error = ENOENT; 1194 KLD_UNLOCK(); 1195 out: 1196 free(pathname, M_TEMP); 1197 return (error); 1198 } 1199 1200 int 1201 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1202 { 1203 linker_file_t lf; 1204 int error = 0; 1205 1206 #ifdef MAC 1207 error = mac_kld_check_stat(td->td_ucred); 1208 if (error) 1209 return (error); 1210 #endif 1211 1212 KLD_LOCK(); 1213 if (uap->fileid == 0) 1214 lf = TAILQ_FIRST(&linker_files); 1215 else { 1216 lf = linker_find_file_by_id(uap->fileid); 1217 if (lf == NULL) { 1218 error = ENOENT; 1219 goto out; 1220 } 1221 lf = TAILQ_NEXT(lf, link); 1222 } 1223 1224 /* Skip partially loaded files. */ 1225 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1226 lf = TAILQ_NEXT(lf, link); 1227 1228 if (lf) 1229 td->td_retval[0] = lf->id; 1230 else 1231 td->td_retval[0] = 0; 1232 out: 1233 KLD_UNLOCK(); 1234 return (error); 1235 } 1236 1237 int 1238 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1239 { 1240 struct kld_file_stat stat; 1241 int error, version; 1242 1243 /* 1244 * Check the version of the user's structure. 1245 */ 1246 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1247 != 0) 1248 return (error); 1249 if (version != sizeof(struct kld_file_stat_1) && 1250 version != sizeof(struct kld_file_stat)) 1251 return (EINVAL); 1252 1253 error = kern_kldstat(td, uap->fileid, &stat); 1254 if (error != 0) 1255 return (error); 1256 return (copyout(&stat, uap->stat, version)); 1257 } 1258 1259 int 1260 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat) 1261 { 1262 linker_file_t lf; 1263 int namelen; 1264 #ifdef MAC 1265 int error; 1266 1267 error = mac_kld_check_stat(td->td_ucred); 1268 if (error) 1269 return (error); 1270 #endif 1271 1272 KLD_LOCK(); 1273 lf = linker_find_file_by_id(fileid); 1274 if (lf == NULL) { 1275 KLD_UNLOCK(); 1276 return (ENOENT); 1277 } 1278 1279 /* Version 1 fields: */ 1280 namelen = strlen(lf->filename) + 1; 1281 if (namelen > MAXPATHLEN) 1282 namelen = MAXPATHLEN; 1283 bcopy(lf->filename, &stat->name[0], namelen); 1284 stat->refs = lf->refs; 1285 stat->id = lf->id; 1286 stat->address = lf->address; 1287 stat->size = lf->size; 1288 /* Version 2 fields: */ 1289 namelen = strlen(lf->pathname) + 1; 1290 if (namelen > MAXPATHLEN) 1291 namelen = MAXPATHLEN; 1292 bcopy(lf->pathname, &stat->pathname[0], namelen); 1293 KLD_UNLOCK(); 1294 1295 td->td_retval[0] = 0; 1296 return (0); 1297 } 1298 1299 int 1300 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1301 { 1302 linker_file_t lf; 1303 module_t mp; 1304 int error = 0; 1305 1306 #ifdef MAC 1307 error = mac_kld_check_stat(td->td_ucred); 1308 if (error) 1309 return (error); 1310 #endif 1311 1312 KLD_LOCK(); 1313 lf = linker_find_file_by_id(uap->fileid); 1314 if (lf) { 1315 MOD_SLOCK; 1316 mp = TAILQ_FIRST(&lf->modules); 1317 if (mp != NULL) 1318 td->td_retval[0] = module_getid(mp); 1319 else 1320 td->td_retval[0] = 0; 1321 MOD_SUNLOCK; 1322 } else 1323 error = ENOENT; 1324 KLD_UNLOCK(); 1325 return (error); 1326 } 1327 1328 int 1329 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1330 { 1331 char *symstr = NULL; 1332 c_linker_sym_t sym; 1333 linker_symval_t symval; 1334 linker_file_t lf; 1335 struct kld_sym_lookup lookup; 1336 int error = 0; 1337 1338 #ifdef MAC 1339 error = mac_kld_check_stat(td->td_ucred); 1340 if (error) 1341 return (error); 1342 #endif 1343 1344 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1345 return (error); 1346 if (lookup.version != sizeof(lookup) || 1347 uap->cmd != KLDSYM_LOOKUP) 1348 return (EINVAL); 1349 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1350 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1351 goto out; 1352 KLD_LOCK(); 1353 if (uap->fileid != 0) { 1354 lf = linker_find_file_by_id(uap->fileid); 1355 if (lf == NULL) 1356 error = ENOENT; 1357 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1358 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1359 lookup.symvalue = (uintptr_t) symval.value; 1360 lookup.symsize = symval.size; 1361 error = copyout(&lookup, uap->data, sizeof(lookup)); 1362 } else 1363 error = ENOENT; 1364 } else { 1365 TAILQ_FOREACH(lf, &linker_files, link) { 1366 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1367 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1368 lookup.symvalue = (uintptr_t)symval.value; 1369 lookup.symsize = symval.size; 1370 error = copyout(&lookup, uap->data, 1371 sizeof(lookup)); 1372 break; 1373 } 1374 } 1375 if (lf == NULL) 1376 error = ENOENT; 1377 } 1378 KLD_UNLOCK(); 1379 out: 1380 free(symstr, M_TEMP); 1381 return (error); 1382 } 1383 1384 /* 1385 * Preloaded module support 1386 */ 1387 1388 static modlist_t 1389 modlist_lookup(const char *name, int ver) 1390 { 1391 modlist_t mod; 1392 1393 TAILQ_FOREACH(mod, &found_modules, link) { 1394 if (strcmp(mod->name, name) == 0 && 1395 (ver == 0 || mod->version == ver)) 1396 return (mod); 1397 } 1398 return (NULL); 1399 } 1400 1401 static modlist_t 1402 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1403 { 1404 modlist_t mod, bestmod; 1405 int ver; 1406 1407 if (verinfo == NULL) 1408 return (modlist_lookup(name, 0)); 1409 bestmod = NULL; 1410 TAILQ_FOREACH(mod, &found_modules, link) { 1411 if (strcmp(mod->name, name) != 0) 1412 continue; 1413 ver = mod->version; 1414 if (ver == verinfo->md_ver_preferred) 1415 return (mod); 1416 if (ver >= verinfo->md_ver_minimum && 1417 ver <= verinfo->md_ver_maximum && 1418 (bestmod == NULL || ver > bestmod->version)) 1419 bestmod = mod; 1420 } 1421 return (bestmod); 1422 } 1423 1424 static modlist_t 1425 modlist_newmodule(const char *modname, int version, linker_file_t container) 1426 { 1427 modlist_t mod; 1428 1429 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1430 if (mod == NULL) 1431 panic("no memory for module list"); 1432 mod->container = container; 1433 mod->name = modname; 1434 mod->version = version; 1435 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1436 return (mod); 1437 } 1438 1439 static void 1440 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1441 struct mod_metadata **stop, int preload) 1442 { 1443 struct mod_metadata *mp, **mdp; 1444 const char *modname; 1445 int ver; 1446 1447 for (mdp = start; mdp < stop; mdp++) { 1448 mp = *mdp; 1449 if (mp->md_type != MDT_VERSION) 1450 continue; 1451 modname = mp->md_cval; 1452 ver = ((struct mod_version *)mp->md_data)->mv_version; 1453 if (modlist_lookup(modname, ver) != NULL) { 1454 printf("module %s already present!\n", modname); 1455 /* XXX what can we do? this is a build error. :-( */ 1456 continue; 1457 } 1458 modlist_newmodule(modname, ver, lf); 1459 } 1460 } 1461 1462 static void 1463 linker_preload(void *arg) 1464 { 1465 caddr_t modptr; 1466 const char *modname, *nmodname; 1467 char *modtype; 1468 linker_file_t lf, nlf; 1469 linker_class_t lc; 1470 int error; 1471 linker_file_list_t loaded_files; 1472 linker_file_list_t depended_files; 1473 struct mod_metadata *mp, *nmp; 1474 struct mod_metadata **start, **stop, **mdp, **nmdp; 1475 struct mod_depend *verinfo; 1476 int nver; 1477 int resolves; 1478 modlist_t mod; 1479 struct sysinit **si_start, **si_stop; 1480 1481 TAILQ_INIT(&loaded_files); 1482 TAILQ_INIT(&depended_files); 1483 TAILQ_INIT(&found_modules); 1484 error = 0; 1485 1486 modptr = NULL; 1487 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1488 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1489 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1490 if (modname == NULL) { 1491 printf("Preloaded module at %p does not have a" 1492 " name!\n", modptr); 1493 continue; 1494 } 1495 if (modtype == NULL) { 1496 printf("Preloaded module at %p does not have a type!\n", 1497 modptr); 1498 continue; 1499 } 1500 if (bootverbose) 1501 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1502 modptr); 1503 lf = NULL; 1504 TAILQ_FOREACH(lc, &classes, link) { 1505 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1506 if (!error) 1507 break; 1508 lf = NULL; 1509 } 1510 if (lf) 1511 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1512 } 1513 1514 /* 1515 * First get a list of stuff in the kernel. 1516 */ 1517 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1518 &stop, NULL) == 0) 1519 linker_addmodules(linker_kernel_file, start, stop, 1); 1520 1521 /* 1522 * This is a once-off kinky bubble sort to resolve relocation 1523 * dependency requirements. 1524 */ 1525 restart: 1526 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1527 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1528 &stop, NULL); 1529 /* 1530 * First, look to see if we would successfully link with this 1531 * stuff. 1532 */ 1533 resolves = 1; /* unless we know otherwise */ 1534 if (!error) { 1535 for (mdp = start; mdp < stop; mdp++) { 1536 mp = *mdp; 1537 if (mp->md_type != MDT_DEPEND) 1538 continue; 1539 modname = mp->md_cval; 1540 verinfo = mp->md_data; 1541 for (nmdp = start; nmdp < stop; nmdp++) { 1542 nmp = *nmdp; 1543 if (nmp->md_type != MDT_VERSION) 1544 continue; 1545 nmodname = nmp->md_cval; 1546 if (strcmp(modname, nmodname) == 0) 1547 break; 1548 } 1549 if (nmdp < stop) /* it's a self reference */ 1550 continue; 1551 1552 /* 1553 * ok, the module isn't here yet, we 1554 * are not finished 1555 */ 1556 if (modlist_lookup2(modname, verinfo) == NULL) 1557 resolves = 0; 1558 } 1559 } 1560 /* 1561 * OK, if we found our modules, we can link. So, "provide" 1562 * the modules inside and add it to the end of the link order 1563 * list. 1564 */ 1565 if (resolves) { 1566 if (!error) { 1567 for (mdp = start; mdp < stop; mdp++) { 1568 mp = *mdp; 1569 if (mp->md_type != MDT_VERSION) 1570 continue; 1571 modname = mp->md_cval; 1572 nver = ((struct mod_version *) 1573 mp->md_data)->mv_version; 1574 if (modlist_lookup(modname, 1575 nver) != NULL) { 1576 printf("module %s already" 1577 " present!\n", modname); 1578 TAILQ_REMOVE(&loaded_files, 1579 lf, loaded); 1580 linker_file_unload(lf, 1581 LINKER_UNLOAD_FORCE); 1582 /* we changed tailq next ptr */ 1583 goto restart; 1584 } 1585 modlist_newmodule(modname, nver, lf); 1586 } 1587 } 1588 TAILQ_REMOVE(&loaded_files, lf, loaded); 1589 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1590 /* 1591 * Since we provided modules, we need to restart the 1592 * sort so that the previous files that depend on us 1593 * have a chance. Also, we've busted the tailq next 1594 * pointer with the REMOVE. 1595 */ 1596 goto restart; 1597 } 1598 } 1599 1600 /* 1601 * At this point, we check to see what could not be resolved.. 1602 */ 1603 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1604 TAILQ_REMOVE(&loaded_files, lf, loaded); 1605 printf("KLD file %s is missing dependencies\n", lf->filename); 1606 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1607 } 1608 1609 /* 1610 * We made it. Finish off the linking in the order we determined. 1611 */ 1612 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1613 if (linker_kernel_file) { 1614 linker_kernel_file->refs++; 1615 error = linker_file_add_dependency(lf, 1616 linker_kernel_file); 1617 if (error) 1618 panic("cannot add dependency"); 1619 } 1620 lf->userrefs++; /* so we can (try to) kldunload it */ 1621 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1622 &stop, NULL); 1623 if (!error) { 1624 for (mdp = start; mdp < stop; mdp++) { 1625 mp = *mdp; 1626 if (mp->md_type != MDT_DEPEND) 1627 continue; 1628 modname = mp->md_cval; 1629 verinfo = mp->md_data; 1630 mod = modlist_lookup2(modname, verinfo); 1631 if (mod == NULL) { 1632 printf("KLD file %s - cannot find " 1633 "dependency \"%s\"\n", 1634 lf->filename, modname); 1635 goto fail; 1636 } 1637 /* Don't count self-dependencies */ 1638 if (lf == mod->container) 1639 continue; 1640 mod->container->refs++; 1641 error = linker_file_add_dependency(lf, 1642 mod->container); 1643 if (error) 1644 panic("cannot add dependency"); 1645 } 1646 } 1647 /* 1648 * Now do relocation etc using the symbol search paths 1649 * established by the dependencies 1650 */ 1651 error = LINKER_LINK_PRELOAD_FINISH(lf); 1652 if (error) { 1653 printf("KLD file %s - could not finalize loading\n", 1654 lf->filename); 1655 goto fail; 1656 } 1657 linker_file_register_modules(lf); 1658 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1659 &si_stop, NULL) == 0) 1660 sysinit_add(si_start, si_stop); 1661 linker_file_register_sysctls(lf); 1662 lf->flags |= LINKER_FILE_LINKED; 1663 continue; 1664 fail: 1665 TAILQ_REMOVE(&depended_files, lf, loaded); 1666 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1667 } 1668 /* woohoo! we made it! */ 1669 } 1670 1671 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1672 1673 /* 1674 * Search for a not-loaded module by name. 1675 * 1676 * Modules may be found in the following locations: 1677 * 1678 * - preloaded (result is just the module name) - on disk (result is full path 1679 * to module) 1680 * 1681 * If the module name is qualified in any way (contains path, etc.) the we 1682 * simply return a copy of it. 1683 * 1684 * The search path can be manipulated via sysctl. Note that we use the ';' 1685 * character as a separator to be consistent with the bootloader. 1686 */ 1687 1688 static char linker_hintfile[] = "linker.hints"; 1689 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1690 1691 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1692 sizeof(linker_path), "module load search path"); 1693 1694 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1695 1696 static char *linker_ext_list[] = { 1697 "", 1698 ".ko", 1699 NULL 1700 }; 1701 1702 /* 1703 * Check if file actually exists either with or without extension listed in 1704 * the linker_ext_list. (probably should be generic for the rest of the 1705 * kernel) 1706 */ 1707 static char * 1708 linker_lookup_file(const char *path, int pathlen, const char *name, 1709 int namelen, struct vattr *vap) 1710 { 1711 struct nameidata nd; 1712 struct thread *td = curthread; /* XXX */ 1713 char *result, **cpp, *sep; 1714 int error, len, extlen, reclen, flags; 1715 enum vtype type; 1716 1717 extlen = 0; 1718 for (cpp = linker_ext_list; *cpp; cpp++) { 1719 len = strlen(*cpp); 1720 if (len > extlen) 1721 extlen = len; 1722 } 1723 extlen++; /* trailing '\0' */ 1724 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1725 1726 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1727 result = malloc(reclen, M_LINKER, M_WAITOK); 1728 for (cpp = linker_ext_list; *cpp; cpp++) { 1729 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1730 namelen, name, *cpp); 1731 /* 1732 * Attempt to open the file, and return the path if 1733 * we succeed and it's a regular file. 1734 */ 1735 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1736 flags = FREAD; 1737 error = vn_open(&nd, &flags, 0, NULL); 1738 if (error == 0) { 1739 NDFREE(&nd, NDF_ONLY_PNBUF); 1740 type = nd.ni_vp->v_type; 1741 if (vap) 1742 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1743 VOP_UNLOCK(nd.ni_vp, 0); 1744 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1745 if (type == VREG) 1746 return (result); 1747 } 1748 } 1749 free(result, M_LINKER); 1750 return (NULL); 1751 } 1752 1753 #define INT_ALIGN(base, ptr) ptr = \ 1754 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 1755 1756 /* 1757 * Lookup KLD which contains requested module in the "linker.hints" file. If 1758 * version specification is available, then try to find the best KLD. 1759 * Otherwise just find the latest one. 1760 */ 1761 static char * 1762 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1763 int modnamelen, struct mod_depend *verinfo) 1764 { 1765 struct thread *td = curthread; /* XXX */ 1766 struct ucred *cred = td ? td->td_ucred : NULL; 1767 struct nameidata nd; 1768 struct vattr vattr, mattr; 1769 u_char *hints = NULL; 1770 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1771 int error, ival, bestver, *intp, found, flags, clen, blen; 1772 ssize_t reclen; 1773 1774 result = NULL; 1775 bestver = found = 0; 1776 1777 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1778 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1779 strlen(sep) + 1; 1780 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1781 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1782 linker_hintfile); 1783 1784 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1785 flags = FREAD; 1786 error = vn_open(&nd, &flags, 0, NULL); 1787 if (error) 1788 goto bad; 1789 NDFREE(&nd, NDF_ONLY_PNBUF); 1790 if (nd.ni_vp->v_type != VREG) 1791 goto bad; 1792 best = cp = NULL; 1793 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1794 if (error) 1795 goto bad; 1796 /* 1797 * XXX: we need to limit this number to some reasonable value 1798 */ 1799 if (vattr.va_size > 100 * 1024) { 1800 printf("hints file too large %ld\n", (long)vattr.va_size); 1801 goto bad; 1802 } 1803 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1804 if (hints == NULL) 1805 goto bad; 1806 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1807 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1808 if (error) 1809 goto bad; 1810 VOP_UNLOCK(nd.ni_vp, 0); 1811 vn_close(nd.ni_vp, FREAD, cred, td); 1812 nd.ni_vp = NULL; 1813 if (reclen != 0) { 1814 printf("can't read %zd\n", reclen); 1815 goto bad; 1816 } 1817 intp = (int *)hints; 1818 ival = *intp++; 1819 if (ival != LINKER_HINTS_VERSION) { 1820 printf("hints file version mismatch %d\n", ival); 1821 goto bad; 1822 } 1823 bufend = hints + vattr.va_size; 1824 recptr = (u_char *)intp; 1825 clen = blen = 0; 1826 while (recptr < bufend && !found) { 1827 intp = (int *)recptr; 1828 reclen = *intp++; 1829 ival = *intp++; 1830 cp = (char *)intp; 1831 switch (ival) { 1832 case MDT_VERSION: 1833 clen = *cp++; 1834 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1835 break; 1836 cp += clen; 1837 INT_ALIGN(hints, cp); 1838 ival = *(int *)cp; 1839 cp += sizeof(int); 1840 clen = *cp++; 1841 if (verinfo == NULL || 1842 ival == verinfo->md_ver_preferred) { 1843 found = 1; 1844 break; 1845 } 1846 if (ival >= verinfo->md_ver_minimum && 1847 ival <= verinfo->md_ver_maximum && 1848 ival > bestver) { 1849 bestver = ival; 1850 best = cp; 1851 blen = clen; 1852 } 1853 break; 1854 default: 1855 break; 1856 } 1857 recptr += reclen + sizeof(int); 1858 } 1859 /* 1860 * Finally check if KLD is in the place 1861 */ 1862 if (found) 1863 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1864 else if (best) 1865 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1866 1867 /* 1868 * KLD is newer than hints file. What we should do now? 1869 */ 1870 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1871 printf("warning: KLD '%s' is newer than the linker.hints" 1872 " file\n", result); 1873 bad: 1874 free(pathbuf, M_LINKER); 1875 if (hints) 1876 free(hints, M_TEMP); 1877 if (nd.ni_vp != NULL) { 1878 VOP_UNLOCK(nd.ni_vp, 0); 1879 vn_close(nd.ni_vp, FREAD, cred, td); 1880 } 1881 /* 1882 * If nothing found or hints is absent - fallback to the old 1883 * way by using "kldname[.ko]" as module name. 1884 */ 1885 if (!found && !bestver && result == NULL) 1886 result = linker_lookup_file(path, pathlen, modname, 1887 modnamelen, NULL); 1888 return (result); 1889 } 1890 1891 /* 1892 * Lookup KLD which contains requested module in the all directories. 1893 */ 1894 static char * 1895 linker_search_module(const char *modname, int modnamelen, 1896 struct mod_depend *verinfo) 1897 { 1898 char *cp, *ep, *result; 1899 1900 /* 1901 * traverse the linker path 1902 */ 1903 for (cp = linker_path; *cp; cp = ep + 1) { 1904 /* find the end of this component */ 1905 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1906 result = linker_hints_lookup(cp, ep - cp, modname, 1907 modnamelen, verinfo); 1908 if (result != NULL) 1909 return (result); 1910 if (*ep == 0) 1911 break; 1912 } 1913 return (NULL); 1914 } 1915 1916 /* 1917 * Search for module in all directories listed in the linker_path. 1918 */ 1919 static char * 1920 linker_search_kld(const char *name) 1921 { 1922 char *cp, *ep, *result; 1923 int len; 1924 1925 /* qualified at all? */ 1926 if (strchr(name, '/')) 1927 return (linker_strdup(name)); 1928 1929 /* traverse the linker path */ 1930 len = strlen(name); 1931 for (ep = linker_path; *ep; ep++) { 1932 cp = ep; 1933 /* find the end of this component */ 1934 for (; *ep != 0 && *ep != ';'; ep++); 1935 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 1936 if (result != NULL) 1937 return (result); 1938 } 1939 return (NULL); 1940 } 1941 1942 static const char * 1943 linker_basename(const char *path) 1944 { 1945 const char *filename; 1946 1947 filename = strrchr(path, '/'); 1948 if (filename == NULL) 1949 return path; 1950 if (filename[1]) 1951 filename++; 1952 return (filename); 1953 } 1954 1955 #ifdef HWPMC_HOOKS 1956 /* 1957 * Inform hwpmc about the set of kernel modules currently loaded. 1958 */ 1959 void * 1960 linker_hwpmc_list_objects(void) 1961 { 1962 linker_file_t lf; 1963 struct pmckern_map_in *kobase; 1964 int i, nmappings; 1965 1966 nmappings = 0; 1967 KLD_LOCK_READ(); 1968 TAILQ_FOREACH(lf, &linker_files, link) 1969 nmappings++; 1970 1971 /* Allocate nmappings + 1 entries. */ 1972 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 1973 M_LINKER, M_WAITOK | M_ZERO); 1974 i = 0; 1975 TAILQ_FOREACH(lf, &linker_files, link) { 1976 1977 /* Save the info for this linker file. */ 1978 kobase[i].pm_file = lf->filename; 1979 kobase[i].pm_address = (uintptr_t)lf->address; 1980 i++; 1981 } 1982 KLD_UNLOCK_READ(); 1983 1984 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 1985 1986 /* The last entry of the malloced area comprises of all zeros. */ 1987 KASSERT(kobase[i].pm_file == NULL, 1988 ("linker_hwpmc_list_objects: last object not NULL")); 1989 1990 return ((void *)kobase); 1991 } 1992 #endif 1993 1994 /* 1995 * Find a file which contains given module and load it, if "parent" is not 1996 * NULL, register a reference to it. 1997 */ 1998 static int 1999 linker_load_module(const char *kldname, const char *modname, 2000 struct linker_file *parent, struct mod_depend *verinfo, 2001 struct linker_file **lfpp) 2002 { 2003 linker_file_t lfdep; 2004 const char *filename; 2005 char *pathname; 2006 int error; 2007 2008 KLD_LOCK_ASSERT(); 2009 if (modname == NULL) { 2010 /* 2011 * We have to load KLD 2012 */ 2013 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 2014 " is not NULL")); 2015 pathname = linker_search_kld(kldname); 2016 } else { 2017 if (modlist_lookup2(modname, verinfo) != NULL) 2018 return (EEXIST); 2019 if (kldname != NULL) 2020 pathname = linker_strdup(kldname); 2021 else if (rootvnode == NULL) 2022 pathname = NULL; 2023 else 2024 /* 2025 * Need to find a KLD with required module 2026 */ 2027 pathname = linker_search_module(modname, 2028 strlen(modname), verinfo); 2029 } 2030 if (pathname == NULL) 2031 return (ENOENT); 2032 2033 /* 2034 * Can't load more than one file with the same basename XXX: 2035 * Actually it should be possible to have multiple KLDs with 2036 * the same basename but different path because they can 2037 * provide different versions of the same modules. 2038 */ 2039 filename = linker_basename(pathname); 2040 if (linker_find_file_by_name(filename)) 2041 error = EEXIST; 2042 else do { 2043 error = linker_load_file(pathname, &lfdep); 2044 if (error) 2045 break; 2046 if (modname && verinfo && 2047 modlist_lookup2(modname, verinfo) == NULL) { 2048 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2049 error = ENOENT; 2050 break; 2051 } 2052 if (parent) { 2053 error = linker_file_add_dependency(parent, lfdep); 2054 if (error) 2055 break; 2056 } 2057 if (lfpp) 2058 *lfpp = lfdep; 2059 } while (0); 2060 free(pathname, M_LINKER); 2061 return (error); 2062 } 2063 2064 /* 2065 * This routine is responsible for finding dependencies of userland initiated 2066 * kldload(2)'s of files. 2067 */ 2068 int 2069 linker_load_dependencies(linker_file_t lf) 2070 { 2071 linker_file_t lfdep; 2072 struct mod_metadata **start, **stop, **mdp, **nmdp; 2073 struct mod_metadata *mp, *nmp; 2074 struct mod_depend *verinfo; 2075 modlist_t mod; 2076 const char *modname, *nmodname; 2077 int ver, error = 0, count; 2078 2079 /* 2080 * All files are dependant on /kernel. 2081 */ 2082 KLD_LOCK_ASSERT(); 2083 if (linker_kernel_file) { 2084 linker_kernel_file->refs++; 2085 error = linker_file_add_dependency(lf, linker_kernel_file); 2086 if (error) 2087 return (error); 2088 } 2089 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2090 &count) != 0) 2091 return (0); 2092 for (mdp = start; mdp < stop; mdp++) { 2093 mp = *mdp; 2094 if (mp->md_type != MDT_VERSION) 2095 continue; 2096 modname = mp->md_cval; 2097 ver = ((struct mod_version *)mp->md_data)->mv_version; 2098 mod = modlist_lookup(modname, ver); 2099 if (mod != NULL) { 2100 printf("interface %s.%d already present in the KLD" 2101 " '%s'!\n", modname, ver, 2102 mod->container->filename); 2103 return (EEXIST); 2104 } 2105 } 2106 2107 for (mdp = start; mdp < stop; mdp++) { 2108 mp = *mdp; 2109 if (mp->md_type != MDT_DEPEND) 2110 continue; 2111 modname = mp->md_cval; 2112 verinfo = mp->md_data; 2113 nmodname = NULL; 2114 for (nmdp = start; nmdp < stop; nmdp++) { 2115 nmp = *nmdp; 2116 if (nmp->md_type != MDT_VERSION) 2117 continue; 2118 nmodname = nmp->md_cval; 2119 if (strcmp(modname, nmodname) == 0) 2120 break; 2121 } 2122 if (nmdp < stop)/* early exit, it's a self reference */ 2123 continue; 2124 mod = modlist_lookup2(modname, verinfo); 2125 if (mod) { /* woohoo, it's loaded already */ 2126 lfdep = mod->container; 2127 lfdep->refs++; 2128 error = linker_file_add_dependency(lf, lfdep); 2129 if (error) 2130 break; 2131 continue; 2132 } 2133 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2134 if (error) { 2135 printf("KLD %s: depends on %s - not available or" 2136 " version mismatch\n", lf->filename, modname); 2137 break; 2138 } 2139 } 2140 2141 if (error) 2142 return (error); 2143 linker_addmodules(lf, start, stop, 0); 2144 return (error); 2145 } 2146 2147 static int 2148 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2149 { 2150 struct sysctl_req *req; 2151 2152 req = opaque; 2153 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2154 } 2155 2156 /* 2157 * Export a nul-separated, double-nul-terminated list of all function names 2158 * in the kernel. 2159 */ 2160 static int 2161 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2162 { 2163 linker_file_t lf; 2164 int error; 2165 2166 #ifdef MAC 2167 error = mac_kld_check_stat(req->td->td_ucred); 2168 if (error) 2169 return (error); 2170 #endif 2171 error = sysctl_wire_old_buffer(req, 0); 2172 if (error != 0) 2173 return (error); 2174 KLD_LOCK(); 2175 TAILQ_FOREACH(lf, &linker_files, link) { 2176 error = LINKER_EACH_FUNCTION_NAME(lf, 2177 sysctl_kern_function_list_iterate, req); 2178 if (error) { 2179 KLD_UNLOCK(); 2180 return (error); 2181 } 2182 } 2183 KLD_UNLOCK(); 2184 return (SYSCTL_OUT(req, "", 1)); 2185 } 2186 2187 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD, 2188 NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 2189