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 #ifdef DDB 58 #include <ddb/ddb.h> 59 #endif 60 61 #include <net/vnet.h> 62 63 #include <security/mac/mac_framework.h> 64 65 #include "linker_if.h" 66 67 #ifdef HWPMC_HOOKS 68 #include <sys/pmckern.h> 69 #endif 70 71 #ifdef KLD_DEBUG 72 int kld_debug = 0; 73 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RWTUN, 74 &kld_debug, 0, "Set various levels of KLD debug"); 75 #endif 76 77 /* These variables are used by kernel debuggers to enumerate loaded files. */ 78 const int kld_off_address = offsetof(struct linker_file, address); 79 const int kld_off_filename = offsetof(struct linker_file, filename); 80 const int kld_off_pathname = offsetof(struct linker_file, pathname); 81 const int kld_off_next = offsetof(struct linker_file, link.tqe_next); 82 83 /* 84 * static char *linker_search_path(const char *name, struct mod_depend 85 * *verinfo); 86 */ 87 static const char *linker_basename(const char *path); 88 89 /* 90 * Find a currently loaded file given its filename. 91 */ 92 static linker_file_t linker_find_file_by_name(const char* _filename); 93 94 /* 95 * Find a currently loaded file given its file id. 96 */ 97 static linker_file_t linker_find_file_by_id(int _fileid); 98 99 /* Metadata from the static kernel */ 100 SET_DECLARE(modmetadata_set, struct mod_metadata); 101 102 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 103 104 linker_file_t linker_kernel_file; 105 106 static struct sx kld_sx; /* kernel linker lock */ 107 108 /* 109 * Load counter used by clients to determine if a linker file has been 110 * re-loaded. This counter is incremented for each file load. 111 */ 112 static int loadcnt; 113 114 static linker_class_list_t classes; 115 static linker_file_list_t linker_files; 116 static int next_file_id = 1; 117 static int linker_no_more_classes = 0; 118 119 #define LINKER_GET_NEXT_FILE_ID(a) do { \ 120 linker_file_t lftmp; \ 121 \ 122 if (!cold) \ 123 sx_assert(&kld_sx, SA_XLOCKED); \ 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 const struct mod_depend *verinfo, struct linker_file **lfpp); 153 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo); 154 155 static void 156 linker_init(void *arg) 157 { 158 159 sx_init(&kld_sx, "kernel linker"); 160 TAILQ_INIT(&classes); 161 TAILQ_INIT(&linker_files); 162 } 163 164 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0); 165 166 static void 167 linker_stop_class_add(void *arg) 168 { 169 170 linker_no_more_classes = 1; 171 } 172 173 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL); 174 175 int 176 linker_add_class(linker_class_t lc) 177 { 178 179 /* 180 * We disallow any class registration past SI_ORDER_ANY 181 * of SI_SUB_KLD. We bump the reference count to keep the 182 * ops from being freed. 183 */ 184 if (linker_no_more_classes == 1) 185 return (EPERM); 186 kobj_class_compile((kobj_class_t) lc); 187 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */ 188 TAILQ_INSERT_TAIL(&classes, lc, link); 189 return (0); 190 } 191 192 static void 193 linker_file_sysinit(linker_file_t lf) 194 { 195 struct sysinit **start, **stop, **sipp, **xipp, *save; 196 197 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 198 lf->filename)); 199 200 sx_assert(&kld_sx, SA_XLOCKED); 201 202 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 203 return; 204 /* 205 * Perform a bubble sort of the system initialization objects by 206 * their subsystem (primary key) and order (secondary key). 207 * 208 * Since some things care about execution order, this is the operation 209 * which ensures continued function. 210 */ 211 for (sipp = start; sipp < stop; sipp++) { 212 for (xipp = sipp + 1; xipp < stop; xipp++) { 213 if ((*sipp)->subsystem < (*xipp)->subsystem || 214 ((*sipp)->subsystem == (*xipp)->subsystem && 215 (*sipp)->order <= (*xipp)->order)) 216 continue; /* skip */ 217 save = *sipp; 218 *sipp = *xipp; 219 *xipp = save; 220 } 221 } 222 223 /* 224 * Traverse the (now) ordered list of system initialization tasks. 225 * Perform each task, and continue on to the next task. 226 */ 227 sx_xunlock(&kld_sx); 228 mtx_lock(&Giant); 229 for (sipp = start; sipp < stop; sipp++) { 230 if ((*sipp)->subsystem == SI_SUB_DUMMY) 231 continue; /* skip dummy task(s) */ 232 233 /* Call function */ 234 (*((*sipp)->func)) ((*sipp)->udata); 235 } 236 mtx_unlock(&Giant); 237 sx_xlock(&kld_sx); 238 } 239 240 static void 241 linker_file_sysuninit(linker_file_t lf) 242 { 243 struct sysinit **start, **stop, **sipp, **xipp, *save; 244 245 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 246 lf->filename)); 247 248 sx_assert(&kld_sx, SA_XLOCKED); 249 250 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 251 NULL) != 0) 252 return; 253 254 /* 255 * Perform a reverse bubble sort of the system initialization objects 256 * by their subsystem (primary key) and order (secondary key). 257 * 258 * Since some things care about execution order, this is the operation 259 * which ensures continued function. 260 */ 261 for (sipp = start; sipp < stop; sipp++) { 262 for (xipp = sipp + 1; xipp < stop; xipp++) { 263 if ((*sipp)->subsystem > (*xipp)->subsystem || 264 ((*sipp)->subsystem == (*xipp)->subsystem && 265 (*sipp)->order >= (*xipp)->order)) 266 continue; /* skip */ 267 save = *sipp; 268 *sipp = *xipp; 269 *xipp = save; 270 } 271 } 272 273 /* 274 * Traverse the (now) ordered list of system initialization tasks. 275 * Perform each task, and continue on to the next task. 276 */ 277 sx_xunlock(&kld_sx); 278 mtx_lock(&Giant); 279 for (sipp = start; sipp < stop; sipp++) { 280 if ((*sipp)->subsystem == SI_SUB_DUMMY) 281 continue; /* skip dummy task(s) */ 282 283 /* Call function */ 284 (*((*sipp)->func)) ((*sipp)->udata); 285 } 286 mtx_unlock(&Giant); 287 sx_xlock(&kld_sx); 288 } 289 290 static void 291 linker_file_register_sysctls(linker_file_t lf, bool enable) 292 { 293 struct sysctl_oid **start, **stop, **oidp; 294 295 KLD_DPF(FILE, 296 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 297 lf->filename)); 298 299 sx_assert(&kld_sx, SA_XLOCKED); 300 301 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 302 return; 303 304 sx_xunlock(&kld_sx); 305 sysctl_wlock(); 306 for (oidp = start; oidp < stop; oidp++) { 307 if (enable) 308 sysctl_register_oid(*oidp); 309 else 310 sysctl_register_disabled_oid(*oidp); 311 } 312 sysctl_wunlock(); 313 sx_xlock(&kld_sx); 314 } 315 316 static void 317 linker_file_enable_sysctls(linker_file_t lf) 318 { 319 struct sysctl_oid **start, **stop, **oidp; 320 321 KLD_DPF(FILE, 322 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n", 323 lf->filename)); 324 325 sx_assert(&kld_sx, SA_XLOCKED); 326 327 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 328 return; 329 330 sx_xunlock(&kld_sx); 331 sysctl_wlock(); 332 for (oidp = start; oidp < stop; oidp++) 333 sysctl_enable_oid(*oidp); 334 sysctl_wunlock(); 335 sx_xlock(&kld_sx); 336 } 337 338 static void 339 linker_file_unregister_sysctls(linker_file_t lf) 340 { 341 struct sysctl_oid **start, **stop, **oidp; 342 343 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs" 344 " for %s\n", lf->filename)); 345 346 sx_assert(&kld_sx, SA_XLOCKED); 347 348 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 349 return; 350 351 sx_xunlock(&kld_sx); 352 sysctl_wlock(); 353 for (oidp = start; oidp < stop; oidp++) 354 sysctl_unregister_oid(*oidp); 355 sysctl_wunlock(); 356 sx_xlock(&kld_sx); 357 } 358 359 static int 360 linker_file_register_modules(linker_file_t lf) 361 { 362 struct mod_metadata **start, **stop, **mdp; 363 const moduledata_t *moddata; 364 int first_error, error; 365 366 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 367 " in %s\n", lf->filename)); 368 369 sx_assert(&kld_sx, SA_XLOCKED); 370 371 if (linker_file_lookup_set(lf, "modmetadata_set", &start, 372 &stop, NULL) != 0) { 373 /* 374 * This fallback should be unnecessary, but if we get booted 375 * from boot2 instead of loader and we are missing our 376 * metadata then we have to try the best we can. 377 */ 378 if (lf == linker_kernel_file) { 379 start = SET_BEGIN(modmetadata_set); 380 stop = SET_LIMIT(modmetadata_set); 381 } else 382 return (0); 383 } 384 first_error = 0; 385 for (mdp = start; mdp < stop; mdp++) { 386 if ((*mdp)->md_type != MDT_MODULE) 387 continue; 388 moddata = (*mdp)->md_data; 389 KLD_DPF(FILE, ("Registering module %s in %s\n", 390 moddata->name, lf->filename)); 391 error = module_register(moddata, lf); 392 if (error) { 393 printf("Module %s failed to register: %d\n", 394 moddata->name, error); 395 if (first_error == 0) 396 first_error = error; 397 } 398 } 399 return (first_error); 400 } 401 402 static void 403 linker_init_kernel_modules(void) 404 { 405 406 sx_xlock(&kld_sx); 407 linker_file_register_modules(linker_kernel_file); 408 sx_xunlock(&kld_sx); 409 } 410 411 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 412 0); 413 414 static int 415 linker_load_file(const char *filename, linker_file_t *result) 416 { 417 linker_class_t lc; 418 linker_file_t lf; 419 int foundfile, error, modules; 420 421 /* Refuse to load modules if securelevel raised */ 422 if (prison0.pr_securelevel > 0) 423 return (EPERM); 424 425 sx_assert(&kld_sx, SA_XLOCKED); 426 lf = linker_find_file_by_name(filename); 427 if (lf) { 428 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 429 " incrementing refs\n", filename)); 430 *result = lf; 431 lf->refs++; 432 return (0); 433 } 434 foundfile = 0; 435 error = 0; 436 437 /* 438 * We do not need to protect (lock) classes here because there is 439 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 440 * and there is no class deregistration mechanism at this time. 441 */ 442 TAILQ_FOREACH(lc, &classes, link) { 443 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 444 filename)); 445 error = LINKER_LOAD_FILE(lc, filename, &lf); 446 /* 447 * If we got something other than ENOENT, then it exists but 448 * we cannot load it for some other reason. 449 */ 450 if (error != ENOENT) 451 foundfile = 1; 452 if (lf) { 453 error = linker_file_register_modules(lf); 454 if (error == EEXIST) { 455 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 456 return (error); 457 } 458 modules = !TAILQ_EMPTY(&lf->modules); 459 linker_file_register_sysctls(lf, false); 460 linker_file_sysinit(lf); 461 lf->flags |= LINKER_FILE_LINKED; 462 463 /* 464 * If all of the modules in this file failed 465 * to load, unload the file and return an 466 * error of ENOEXEC. 467 */ 468 if (modules && TAILQ_EMPTY(&lf->modules)) { 469 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 470 return (ENOEXEC); 471 } 472 linker_file_enable_sysctls(lf); 473 EVENTHANDLER_INVOKE(kld_load, lf); 474 *result = lf; 475 return (0); 476 } 477 } 478 /* 479 * Less than ideal, but tells the user whether it failed to load or 480 * the module was not found. 481 */ 482 if (foundfile) { 483 484 /* 485 * If the file type has not been recognized by the last try 486 * printout a message before to fail. 487 */ 488 if (error == ENOSYS) 489 printf("%s: %s - unsupported file type\n", 490 __func__, filename); 491 492 /* 493 * Format not recognized or otherwise unloadable. 494 * When loading a module that is statically built into 495 * the kernel EEXIST percolates back up as the return 496 * value. Preserve this so that apps like sysinstall 497 * can recognize this special case and not post bogus 498 * dialog boxes. 499 */ 500 if (error != EEXIST) 501 error = ENOEXEC; 502 } else 503 error = ENOENT; /* Nothing found */ 504 return (error); 505 } 506 507 int 508 linker_reference_module(const char *modname, struct mod_depend *verinfo, 509 linker_file_t *result) 510 { 511 modlist_t mod; 512 int error; 513 514 sx_xlock(&kld_sx); 515 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 516 *result = mod->container; 517 (*result)->refs++; 518 sx_xunlock(&kld_sx); 519 return (0); 520 } 521 522 error = linker_load_module(NULL, modname, NULL, verinfo, result); 523 sx_xunlock(&kld_sx); 524 return (error); 525 } 526 527 int 528 linker_release_module(const char *modname, struct mod_depend *verinfo, 529 linker_file_t lf) 530 { 531 modlist_t mod; 532 int error; 533 534 sx_xlock(&kld_sx); 535 if (lf == NULL) { 536 KASSERT(modname != NULL, 537 ("linker_release_module: no file or name")); 538 mod = modlist_lookup2(modname, verinfo); 539 if (mod == NULL) { 540 sx_xunlock(&kld_sx); 541 return (ESRCH); 542 } 543 lf = mod->container; 544 } else 545 KASSERT(modname == NULL && verinfo == NULL, 546 ("linker_release_module: both file and name")); 547 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL); 548 sx_xunlock(&kld_sx); 549 return (error); 550 } 551 552 static linker_file_t 553 linker_find_file_by_name(const char *filename) 554 { 555 linker_file_t lf; 556 char *koname; 557 558 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 559 sprintf(koname, "%s.ko", filename); 560 561 sx_assert(&kld_sx, SA_XLOCKED); 562 TAILQ_FOREACH(lf, &linker_files, link) { 563 if (strcmp(lf->filename, koname) == 0) 564 break; 565 if (strcmp(lf->filename, filename) == 0) 566 break; 567 } 568 free(koname, M_LINKER); 569 return (lf); 570 } 571 572 static linker_file_t 573 linker_find_file_by_id(int fileid) 574 { 575 linker_file_t lf; 576 577 sx_assert(&kld_sx, SA_XLOCKED); 578 TAILQ_FOREACH(lf, &linker_files, link) 579 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED) 580 break; 581 return (lf); 582 } 583 584 int 585 linker_file_foreach(linker_predicate_t *predicate, void *context) 586 { 587 linker_file_t lf; 588 int retval = 0; 589 590 sx_xlock(&kld_sx); 591 TAILQ_FOREACH(lf, &linker_files, link) { 592 retval = predicate(lf, context); 593 if (retval != 0) 594 break; 595 } 596 sx_xunlock(&kld_sx); 597 return (retval); 598 } 599 600 linker_file_t 601 linker_make_file(const char *pathname, linker_class_t lc) 602 { 603 linker_file_t lf; 604 const char *filename; 605 606 if (!cold) 607 sx_assert(&kld_sx, SA_XLOCKED); 608 filename = linker_basename(pathname); 609 610 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname)); 611 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 612 if (lf == NULL) 613 return (NULL); 614 lf->ctors_addr = 0; 615 lf->ctors_size = 0; 616 lf->refs = 1; 617 lf->userrefs = 0; 618 lf->flags = 0; 619 lf->filename = strdup(filename, M_LINKER); 620 lf->pathname = strdup(pathname, M_LINKER); 621 LINKER_GET_NEXT_FILE_ID(lf->id); 622 lf->ndeps = 0; 623 lf->deps = NULL; 624 lf->loadcnt = ++loadcnt; 625 STAILQ_INIT(&lf->common); 626 TAILQ_INIT(&lf->modules); 627 TAILQ_INSERT_TAIL(&linker_files, lf, link); 628 return (lf); 629 } 630 631 int 632 linker_file_unload(linker_file_t file, int flags) 633 { 634 module_t mod, next; 635 modlist_t ml, nextml; 636 struct common_symbol *cp; 637 int error, i; 638 639 /* Refuse to unload modules if securelevel raised. */ 640 if (prison0.pr_securelevel > 0) 641 return (EPERM); 642 643 sx_assert(&kld_sx, SA_XLOCKED); 644 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 645 646 /* Easy case of just dropping a reference. */ 647 if (file->refs > 1) { 648 file->refs--; 649 return (0); 650 } 651 652 /* Give eventhandlers a chance to prevent the unload. */ 653 error = 0; 654 EVENTHANDLER_INVOKE(kld_unload_try, file, &error); 655 if (error != 0) 656 return (EBUSY); 657 658 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 659 " informing modules\n")); 660 661 /* 662 * Quiesce all the modules to give them a chance to veto the unload. 663 */ 664 MOD_SLOCK; 665 for (mod = TAILQ_FIRST(&file->modules); mod; 666 mod = module_getfnext(mod)) { 667 668 error = module_quiesce(mod); 669 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 670 KLD_DPF(FILE, ("linker_file_unload: module %s" 671 " vetoed unload\n", module_getname(mod))); 672 /* 673 * XXX: Do we need to tell all the quiesced modules 674 * that they can resume work now via a new module 675 * event? 676 */ 677 MOD_SUNLOCK; 678 return (error); 679 } 680 } 681 MOD_SUNLOCK; 682 683 /* 684 * Inform any modules associated with this file that they are 685 * being unloaded. 686 */ 687 MOD_XLOCK; 688 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 689 next = module_getfnext(mod); 690 MOD_XUNLOCK; 691 692 /* 693 * Give the module a chance to veto the unload. 694 */ 695 if ((error = module_unload(mod)) != 0) { 696 #ifdef KLD_DEBUG 697 MOD_SLOCK; 698 KLD_DPF(FILE, ("linker_file_unload: module %s" 699 " failed unload\n", module_getname(mod))); 700 MOD_SUNLOCK; 701 #endif 702 return (error); 703 } 704 MOD_XLOCK; 705 module_release(mod); 706 } 707 MOD_XUNLOCK; 708 709 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 710 if (ml->container == file) { 711 TAILQ_REMOVE(&found_modules, ml, link); 712 free(ml, M_LINKER); 713 } 714 } 715 716 /* 717 * Don't try to run SYSUNINITs if we are unloaded due to a 718 * link error. 719 */ 720 if (file->flags & LINKER_FILE_LINKED) { 721 file->flags &= ~LINKER_FILE_LINKED; 722 linker_file_unregister_sysctls(file); 723 linker_file_sysuninit(file); 724 } 725 TAILQ_REMOVE(&linker_files, file, link); 726 727 if (file->deps) { 728 for (i = 0; i < file->ndeps; i++) 729 linker_file_unload(file->deps[i], flags); 730 free(file->deps, M_LINKER); 731 file->deps = NULL; 732 } 733 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 734 STAILQ_REMOVE_HEAD(&file->common, link); 735 free(cp, M_LINKER); 736 } 737 738 LINKER_UNLOAD(file); 739 740 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address, 741 file->size); 742 743 if (file->filename) { 744 free(file->filename, M_LINKER); 745 file->filename = NULL; 746 } 747 if (file->pathname) { 748 free(file->pathname, M_LINKER); 749 file->pathname = NULL; 750 } 751 kobj_delete((kobj_t) file, M_LINKER); 752 return (0); 753 } 754 755 int 756 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 757 { 758 return (LINKER_CTF_GET(file, lc)); 759 } 760 761 static int 762 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 763 { 764 linker_file_t *newdeps; 765 766 sx_assert(&kld_sx, SA_XLOCKED); 767 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps), 768 M_LINKER, M_WAITOK | M_ZERO); 769 file->deps[file->ndeps] = dep; 770 file->ndeps++; 771 KLD_DPF(FILE, ("linker_file_add_dependency:" 772 " adding %s as dependency for %s\n", 773 dep->filename, file->filename)); 774 return (0); 775 } 776 777 /* 778 * Locate a linker set and its contents. This is a helper function to avoid 779 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 780 * This function is used in this file so we can avoid having lots of (void **) 781 * casts. 782 */ 783 int 784 linker_file_lookup_set(linker_file_t file, const char *name, 785 void *firstp, void *lastp, int *countp) 786 { 787 788 sx_assert(&kld_sx, SA_LOCKED); 789 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 790 } 791 792 /* 793 * List all functions in a file. 794 */ 795 int 796 linker_file_function_listall(linker_file_t lf, 797 linker_function_nameval_callback_t callback_func, void *arg) 798 { 799 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 800 } 801 802 caddr_t 803 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 804 { 805 caddr_t sym; 806 int locked; 807 808 locked = sx_xlocked(&kld_sx); 809 if (!locked) 810 sx_xlock(&kld_sx); 811 sym = linker_file_lookup_symbol_internal(file, name, deps); 812 if (!locked) 813 sx_xunlock(&kld_sx); 814 return (sym); 815 } 816 817 static caddr_t 818 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 819 int deps) 820 { 821 c_linker_sym_t sym; 822 linker_symval_t symval; 823 caddr_t address; 824 size_t common_size = 0; 825 int i; 826 827 sx_assert(&kld_sx, SA_XLOCKED); 828 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 829 file, name, deps)); 830 831 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 832 LINKER_SYMBOL_VALUES(file, sym, &symval); 833 if (symval.value == 0) 834 /* 835 * For commons, first look them up in the 836 * dependencies and only allocate space if not found 837 * there. 838 */ 839 common_size = symval.size; 840 else { 841 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 842 ".value=%p\n", symval.value)); 843 return (symval.value); 844 } 845 } 846 if (deps) { 847 for (i = 0; i < file->ndeps; i++) { 848 address = linker_file_lookup_symbol_internal( 849 file->deps[i], name, 0); 850 if (address) { 851 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 852 " deps value=%p\n", address)); 853 return (address); 854 } 855 } 856 } 857 if (common_size > 0) { 858 /* 859 * This is a common symbol which was not found in the 860 * dependencies. We maintain a simple common symbol table in 861 * the file object. 862 */ 863 struct common_symbol *cp; 864 865 STAILQ_FOREACH(cp, &file->common, link) { 866 if (strcmp(cp->name, name) == 0) { 867 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 868 " old common value=%p\n", cp->address)); 869 return (cp->address); 870 } 871 } 872 /* 873 * Round the symbol size up to align. 874 */ 875 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 876 cp = malloc(sizeof(struct common_symbol) 877 + common_size + strlen(name) + 1, M_LINKER, 878 M_WAITOK | M_ZERO); 879 cp->address = (caddr_t)(cp + 1); 880 cp->name = cp->address + common_size; 881 strcpy(cp->name, name); 882 bzero(cp->address, common_size); 883 STAILQ_INSERT_TAIL(&file->common, cp, link); 884 885 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 886 " value=%p\n", cp->address)); 887 return (cp->address); 888 } 889 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 890 return (0); 891 } 892 893 /* 894 * Both DDB and stack(9) rely on the kernel linker to provide forward and 895 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 896 * do this in a lockfree manner. We provide a set of internal helper 897 * routines to perform these operations without locks, and then wrappers that 898 * optionally lock. 899 * 900 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 901 */ 902 #ifdef DDB 903 static int 904 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 905 { 906 linker_file_t lf; 907 908 TAILQ_FOREACH(lf, &linker_files, link) { 909 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 910 return (0); 911 } 912 return (ENOENT); 913 } 914 #endif 915 916 static int 917 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 918 { 919 linker_file_t lf; 920 c_linker_sym_t best, es; 921 u_long diff, bestdiff, off; 922 923 best = 0; 924 off = (uintptr_t)value; 925 bestdiff = off; 926 TAILQ_FOREACH(lf, &linker_files, link) { 927 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 928 continue; 929 if (es != 0 && diff < bestdiff) { 930 best = es; 931 bestdiff = diff; 932 } 933 if (bestdiff == 0) 934 break; 935 } 936 if (best) { 937 *sym = best; 938 *diffp = bestdiff; 939 return (0); 940 } else { 941 *sym = 0; 942 *diffp = off; 943 return (ENOENT); 944 } 945 } 946 947 static int 948 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 949 { 950 linker_file_t lf; 951 952 TAILQ_FOREACH(lf, &linker_files, link) { 953 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 954 return (0); 955 } 956 return (ENOENT); 957 } 958 959 static int 960 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 961 long *offset) 962 { 963 linker_symval_t symval; 964 c_linker_sym_t sym; 965 int error; 966 967 *offset = 0; 968 error = linker_debug_search_symbol(value, &sym, offset); 969 if (error) 970 return (error); 971 error = linker_debug_symbol_values(sym, &symval); 972 if (error) 973 return (error); 974 strlcpy(buf, symval.name, buflen); 975 return (0); 976 } 977 978 /* 979 * DDB Helpers. DDB has to look across multiple files with their own symbol 980 * tables and string tables. 981 * 982 * Note that we do not obey list locking protocols here. We really don't need 983 * DDB to hang because somebody's got the lock held. We'll take the chance 984 * that the files list is inconsistent instead. 985 */ 986 #ifdef DDB 987 int 988 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 989 { 990 991 return (linker_debug_lookup(symstr, sym)); 992 } 993 #endif 994 995 int 996 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 997 { 998 999 return (linker_debug_search_symbol(value, sym, diffp)); 1000 } 1001 1002 int 1003 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 1004 { 1005 1006 return (linker_debug_symbol_values(sym, symval)); 1007 } 1008 1009 int 1010 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1011 long *offset) 1012 { 1013 1014 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 1015 } 1016 1017 /* 1018 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 1019 * obey locking protocols, and offer a significantly less complex interface. 1020 */ 1021 int 1022 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1023 long *offset) 1024 { 1025 int error; 1026 1027 sx_slock(&kld_sx); 1028 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 1029 sx_sunlock(&kld_sx); 1030 return (error); 1031 } 1032 1033 /* 1034 * Syscalls. 1035 */ 1036 int 1037 kern_kldload(struct thread *td, const char *file, int *fileid) 1038 { 1039 const char *kldname, *modname; 1040 linker_file_t lf; 1041 int error; 1042 1043 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1044 return (error); 1045 1046 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1047 return (error); 1048 1049 /* 1050 * It is possible that kldloaded module will attach a new ifnet, 1051 * so vnet context must be set when this ocurs. 1052 */ 1053 CURVNET_SET(TD_TO_VNET(td)); 1054 1055 /* 1056 * If file does not contain a qualified name or any dot in it 1057 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1058 * name. 1059 */ 1060 if (strchr(file, '/') || strchr(file, '.')) { 1061 kldname = file; 1062 modname = NULL; 1063 } else { 1064 kldname = NULL; 1065 modname = file; 1066 } 1067 1068 sx_xlock(&kld_sx); 1069 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1070 if (error) { 1071 sx_xunlock(&kld_sx); 1072 goto done; 1073 } 1074 lf->userrefs++; 1075 if (fileid != NULL) 1076 *fileid = lf->id; 1077 sx_xunlock(&kld_sx); 1078 1079 done: 1080 CURVNET_RESTORE(); 1081 return (error); 1082 } 1083 1084 int 1085 sys_kldload(struct thread *td, struct kldload_args *uap) 1086 { 1087 char *pathname = NULL; 1088 int error, fileid; 1089 1090 td->td_retval[0] = -1; 1091 1092 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1093 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1094 if (error == 0) { 1095 error = kern_kldload(td, pathname, &fileid); 1096 if (error == 0) 1097 td->td_retval[0] = fileid; 1098 } 1099 free(pathname, M_TEMP); 1100 return (error); 1101 } 1102 1103 int 1104 kern_kldunload(struct thread *td, int fileid, int flags) 1105 { 1106 linker_file_t lf; 1107 int error = 0; 1108 1109 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1110 return (error); 1111 1112 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1113 return (error); 1114 1115 CURVNET_SET(TD_TO_VNET(td)); 1116 sx_xlock(&kld_sx); 1117 lf = linker_find_file_by_id(fileid); 1118 if (lf) { 1119 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1120 1121 if (lf->userrefs == 0) { 1122 /* 1123 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1124 */ 1125 printf("kldunload: attempt to unload file that was" 1126 " loaded by the kernel\n"); 1127 error = EBUSY; 1128 } else { 1129 lf->userrefs--; 1130 error = linker_file_unload(lf, flags); 1131 if (error) 1132 lf->userrefs++; 1133 } 1134 } else 1135 error = ENOENT; 1136 sx_xunlock(&kld_sx); 1137 1138 CURVNET_RESTORE(); 1139 return (error); 1140 } 1141 1142 int 1143 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1144 { 1145 1146 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1147 } 1148 1149 int 1150 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1151 { 1152 1153 if (uap->flags != LINKER_UNLOAD_NORMAL && 1154 uap->flags != LINKER_UNLOAD_FORCE) 1155 return (EINVAL); 1156 return (kern_kldunload(td, uap->fileid, uap->flags)); 1157 } 1158 1159 int 1160 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1161 { 1162 char *pathname; 1163 const char *filename; 1164 linker_file_t lf; 1165 int error; 1166 1167 #ifdef MAC 1168 error = mac_kld_check_stat(td->td_ucred); 1169 if (error) 1170 return (error); 1171 #endif 1172 1173 td->td_retval[0] = -1; 1174 1175 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1176 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1177 goto out; 1178 1179 filename = linker_basename(pathname); 1180 sx_xlock(&kld_sx); 1181 lf = linker_find_file_by_name(filename); 1182 if (lf) 1183 td->td_retval[0] = lf->id; 1184 else 1185 error = ENOENT; 1186 sx_xunlock(&kld_sx); 1187 out: 1188 free(pathname, M_TEMP); 1189 return (error); 1190 } 1191 1192 int 1193 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1194 { 1195 linker_file_t lf; 1196 int error = 0; 1197 1198 #ifdef MAC 1199 error = mac_kld_check_stat(td->td_ucred); 1200 if (error) 1201 return (error); 1202 #endif 1203 1204 sx_xlock(&kld_sx); 1205 if (uap->fileid == 0) 1206 lf = TAILQ_FIRST(&linker_files); 1207 else { 1208 lf = linker_find_file_by_id(uap->fileid); 1209 if (lf == NULL) { 1210 error = ENOENT; 1211 goto out; 1212 } 1213 lf = TAILQ_NEXT(lf, link); 1214 } 1215 1216 /* Skip partially loaded files. */ 1217 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1218 lf = TAILQ_NEXT(lf, link); 1219 1220 if (lf) 1221 td->td_retval[0] = lf->id; 1222 else 1223 td->td_retval[0] = 0; 1224 out: 1225 sx_xunlock(&kld_sx); 1226 return (error); 1227 } 1228 1229 int 1230 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1231 { 1232 struct kld_file_stat *stat; 1233 int error, version; 1234 1235 /* 1236 * Check the version of the user's structure. 1237 */ 1238 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1239 != 0) 1240 return (error); 1241 if (version != sizeof(struct kld_file_stat_1) && 1242 version != sizeof(struct kld_file_stat)) 1243 return (EINVAL); 1244 1245 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO); 1246 error = kern_kldstat(td, uap->fileid, stat); 1247 if (error == 0) 1248 error = copyout(stat, uap->stat, version); 1249 free(stat, M_TEMP); 1250 return (error); 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 sx_xlock(&kld_sx); 1267 lf = linker_find_file_by_id(fileid); 1268 if (lf == NULL) { 1269 sx_xunlock(&kld_sx); 1270 return (ENOENT); 1271 } 1272 1273 /* Version 1 fields: */ 1274 namelen = strlen(lf->filename) + 1; 1275 if (namelen > sizeof(stat->name)) 1276 namelen = sizeof(stat->name); 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 > sizeof(stat->pathname)) 1285 namelen = sizeof(stat->pathname); 1286 bcopy(lf->pathname, &stat->pathname[0], namelen); 1287 sx_xunlock(&kld_sx); 1288 1289 td->td_retval[0] = 0; 1290 return (0); 1291 } 1292 1293 #ifdef DDB 1294 DB_COMMAND(kldstat, db_kldstat) 1295 { 1296 linker_file_t lf; 1297 1298 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2)) 1299 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' '); 1300 #undef POINTER_WIDTH 1301 TAILQ_FOREACH(lf, &linker_files, link) { 1302 if (db_pager_quit) 1303 return; 1304 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs, 1305 lf->address, lf->size, lf->filename); 1306 } 1307 } 1308 #endif /* DDB */ 1309 1310 int 1311 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1312 { 1313 linker_file_t lf; 1314 module_t mp; 1315 int error = 0; 1316 1317 #ifdef MAC 1318 error = mac_kld_check_stat(td->td_ucred); 1319 if (error) 1320 return (error); 1321 #endif 1322 1323 sx_xlock(&kld_sx); 1324 lf = linker_find_file_by_id(uap->fileid); 1325 if (lf) { 1326 MOD_SLOCK; 1327 mp = TAILQ_FIRST(&lf->modules); 1328 if (mp != NULL) 1329 td->td_retval[0] = module_getid(mp); 1330 else 1331 td->td_retval[0] = 0; 1332 MOD_SUNLOCK; 1333 } else 1334 error = ENOENT; 1335 sx_xunlock(&kld_sx); 1336 return (error); 1337 } 1338 1339 int 1340 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1341 { 1342 char *symstr = NULL; 1343 c_linker_sym_t sym; 1344 linker_symval_t symval; 1345 linker_file_t lf; 1346 struct kld_sym_lookup lookup; 1347 int error = 0; 1348 1349 #ifdef MAC 1350 error = mac_kld_check_stat(td->td_ucred); 1351 if (error) 1352 return (error); 1353 #endif 1354 1355 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1356 return (error); 1357 if (lookup.version != sizeof(lookup) || 1358 uap->cmd != KLDSYM_LOOKUP) 1359 return (EINVAL); 1360 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1361 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1362 goto out; 1363 sx_xlock(&kld_sx); 1364 if (uap->fileid != 0) { 1365 lf = linker_find_file_by_id(uap->fileid); 1366 if (lf == NULL) 1367 error = ENOENT; 1368 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1369 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1370 lookup.symvalue = (uintptr_t) symval.value; 1371 lookup.symsize = symval.size; 1372 error = copyout(&lookup, uap->data, sizeof(lookup)); 1373 } else 1374 error = ENOENT; 1375 } else { 1376 TAILQ_FOREACH(lf, &linker_files, link) { 1377 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1378 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1379 lookup.symvalue = (uintptr_t)symval.value; 1380 lookup.symsize = symval.size; 1381 error = copyout(&lookup, uap->data, 1382 sizeof(lookup)); 1383 break; 1384 } 1385 } 1386 if (lf == NULL) 1387 error = ENOENT; 1388 } 1389 sx_xunlock(&kld_sx); 1390 out: 1391 free(symstr, M_TEMP); 1392 return (error); 1393 } 1394 1395 /* 1396 * Preloaded module support 1397 */ 1398 1399 static modlist_t 1400 modlist_lookup(const char *name, int ver) 1401 { 1402 modlist_t mod; 1403 1404 TAILQ_FOREACH(mod, &found_modules, link) { 1405 if (strcmp(mod->name, name) == 0 && 1406 (ver == 0 || mod->version == ver)) 1407 return (mod); 1408 } 1409 return (NULL); 1410 } 1411 1412 static modlist_t 1413 modlist_lookup2(const char *name, const struct mod_depend *verinfo) 1414 { 1415 modlist_t mod, bestmod; 1416 int ver; 1417 1418 if (verinfo == NULL) 1419 return (modlist_lookup(name, 0)); 1420 bestmod = NULL; 1421 TAILQ_FOREACH(mod, &found_modules, link) { 1422 if (strcmp(mod->name, name) != 0) 1423 continue; 1424 ver = mod->version; 1425 if (ver == verinfo->md_ver_preferred) 1426 return (mod); 1427 if (ver >= verinfo->md_ver_minimum && 1428 ver <= verinfo->md_ver_maximum && 1429 (bestmod == NULL || ver > bestmod->version)) 1430 bestmod = mod; 1431 } 1432 return (bestmod); 1433 } 1434 1435 static modlist_t 1436 modlist_newmodule(const char *modname, int version, linker_file_t container) 1437 { 1438 modlist_t mod; 1439 1440 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1441 if (mod == NULL) 1442 panic("no memory for module list"); 1443 mod->container = container; 1444 mod->name = modname; 1445 mod->version = version; 1446 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1447 return (mod); 1448 } 1449 1450 static void 1451 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1452 struct mod_metadata **stop, int preload) 1453 { 1454 struct mod_metadata *mp, **mdp; 1455 const char *modname; 1456 int ver; 1457 1458 for (mdp = start; mdp < stop; mdp++) { 1459 mp = *mdp; 1460 if (mp->md_type != MDT_VERSION) 1461 continue; 1462 modname = mp->md_cval; 1463 ver = ((const struct mod_version *)mp->md_data)->mv_version; 1464 if (modlist_lookup(modname, ver) != NULL) { 1465 printf("module %s already present!\n", modname); 1466 /* XXX what can we do? this is a build error. :-( */ 1467 continue; 1468 } 1469 modlist_newmodule(modname, ver, lf); 1470 } 1471 } 1472 1473 static void 1474 linker_preload(void *arg) 1475 { 1476 caddr_t modptr; 1477 const char *modname, *nmodname; 1478 char *modtype; 1479 linker_file_t lf, nlf; 1480 linker_class_t lc; 1481 int error; 1482 linker_file_list_t loaded_files; 1483 linker_file_list_t depended_files; 1484 struct mod_metadata *mp, *nmp; 1485 struct mod_metadata **start, **stop, **mdp, **nmdp; 1486 const struct mod_depend *verinfo; 1487 int nver; 1488 int resolves; 1489 modlist_t mod; 1490 struct sysinit **si_start, **si_stop; 1491 1492 TAILQ_INIT(&loaded_files); 1493 TAILQ_INIT(&depended_files); 1494 TAILQ_INIT(&found_modules); 1495 error = 0; 1496 1497 modptr = NULL; 1498 sx_xlock(&kld_sx); 1499 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1500 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1501 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1502 if (modname == NULL) { 1503 printf("Preloaded module at %p does not have a" 1504 " name!\n", modptr); 1505 continue; 1506 } 1507 if (modtype == NULL) { 1508 printf("Preloaded module at %p does not have a type!\n", 1509 modptr); 1510 continue; 1511 } 1512 if (bootverbose) 1513 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1514 modptr); 1515 lf = NULL; 1516 TAILQ_FOREACH(lc, &classes, link) { 1517 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1518 if (!error) 1519 break; 1520 lf = NULL; 1521 } 1522 if (lf) 1523 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1524 } 1525 1526 /* 1527 * First get a list of stuff in the kernel. 1528 */ 1529 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1530 &stop, NULL) == 0) 1531 linker_addmodules(linker_kernel_file, start, stop, 1); 1532 1533 /* 1534 * This is a once-off kinky bubble sort to resolve relocation 1535 * dependency requirements. 1536 */ 1537 restart: 1538 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1539 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1540 &stop, NULL); 1541 /* 1542 * First, look to see if we would successfully link with this 1543 * stuff. 1544 */ 1545 resolves = 1; /* unless we know otherwise */ 1546 if (!error) { 1547 for (mdp = start; mdp < stop; mdp++) { 1548 mp = *mdp; 1549 if (mp->md_type != MDT_DEPEND) 1550 continue; 1551 modname = mp->md_cval; 1552 verinfo = mp->md_data; 1553 for (nmdp = start; nmdp < stop; nmdp++) { 1554 nmp = *nmdp; 1555 if (nmp->md_type != MDT_VERSION) 1556 continue; 1557 nmodname = nmp->md_cval; 1558 if (strcmp(modname, nmodname) == 0) 1559 break; 1560 } 1561 if (nmdp < stop) /* it's a self reference */ 1562 continue; 1563 1564 /* 1565 * ok, the module isn't here yet, we 1566 * are not finished 1567 */ 1568 if (modlist_lookup2(modname, verinfo) == NULL) 1569 resolves = 0; 1570 } 1571 } 1572 /* 1573 * OK, if we found our modules, we can link. So, "provide" 1574 * the modules inside and add it to the end of the link order 1575 * list. 1576 */ 1577 if (resolves) { 1578 if (!error) { 1579 for (mdp = start; mdp < stop; mdp++) { 1580 mp = *mdp; 1581 if (mp->md_type != MDT_VERSION) 1582 continue; 1583 modname = mp->md_cval; 1584 nver = ((const struct mod_version *) 1585 mp->md_data)->mv_version; 1586 if (modlist_lookup(modname, 1587 nver) != NULL) { 1588 printf("module %s already" 1589 " present!\n", modname); 1590 TAILQ_REMOVE(&loaded_files, 1591 lf, loaded); 1592 linker_file_unload(lf, 1593 LINKER_UNLOAD_FORCE); 1594 /* we changed tailq next ptr */ 1595 goto restart; 1596 } 1597 modlist_newmodule(modname, nver, lf); 1598 } 1599 } 1600 TAILQ_REMOVE(&loaded_files, lf, loaded); 1601 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1602 /* 1603 * Since we provided modules, we need to restart the 1604 * sort so that the previous files that depend on us 1605 * have a chance. Also, we've busted the tailq next 1606 * pointer with the REMOVE. 1607 */ 1608 goto restart; 1609 } 1610 } 1611 1612 /* 1613 * At this point, we check to see what could not be resolved.. 1614 */ 1615 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1616 TAILQ_REMOVE(&loaded_files, lf, loaded); 1617 printf("KLD file %s is missing dependencies\n", lf->filename); 1618 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1619 } 1620 1621 /* 1622 * We made it. Finish off the linking in the order we determined. 1623 */ 1624 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1625 if (linker_kernel_file) { 1626 linker_kernel_file->refs++; 1627 error = linker_file_add_dependency(lf, 1628 linker_kernel_file); 1629 if (error) 1630 panic("cannot add dependency"); 1631 } 1632 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1633 &stop, NULL); 1634 if (!error) { 1635 for (mdp = start; mdp < stop; mdp++) { 1636 mp = *mdp; 1637 if (mp->md_type != MDT_DEPEND) 1638 continue; 1639 modname = mp->md_cval; 1640 verinfo = mp->md_data; 1641 mod = modlist_lookup2(modname, verinfo); 1642 if (mod == NULL) { 1643 printf("KLD file %s - cannot find " 1644 "dependency \"%s\"\n", 1645 lf->filename, modname); 1646 goto fail; 1647 } 1648 /* Don't count self-dependencies */ 1649 if (lf == mod->container) 1650 continue; 1651 mod->container->refs++; 1652 error = linker_file_add_dependency(lf, 1653 mod->container); 1654 if (error) 1655 panic("cannot add dependency"); 1656 } 1657 } 1658 /* 1659 * Now do relocation etc using the symbol search paths 1660 * established by the dependencies 1661 */ 1662 error = LINKER_LINK_PRELOAD_FINISH(lf); 1663 if (error) { 1664 printf("KLD file %s - could not finalize loading\n", 1665 lf->filename); 1666 goto fail; 1667 } 1668 linker_file_register_modules(lf); 1669 if (!TAILQ_EMPTY(&lf->modules)) 1670 lf->flags |= LINKER_FILE_MODULES; 1671 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1672 &si_stop, NULL) == 0) 1673 sysinit_add(si_start, si_stop); 1674 linker_file_register_sysctls(lf, true); 1675 lf->flags |= LINKER_FILE_LINKED; 1676 continue; 1677 fail: 1678 TAILQ_REMOVE(&depended_files, lf, loaded); 1679 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1680 } 1681 sx_xunlock(&kld_sx); 1682 /* woohoo! we made it! */ 1683 } 1684 1685 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1686 1687 /* 1688 * Handle preload files that failed to load any modules. 1689 */ 1690 static void 1691 linker_preload_finish(void *arg) 1692 { 1693 linker_file_t lf, nlf; 1694 1695 sx_xlock(&kld_sx); 1696 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) { 1697 /* 1698 * If all of the modules in this file failed to load, unload 1699 * the file and return an error of ENOEXEC. (Parity with 1700 * linker_load_file.) 1701 */ 1702 if ((lf->flags & LINKER_FILE_MODULES) != 0 && 1703 TAILQ_EMPTY(&lf->modules)) { 1704 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1705 continue; 1706 } 1707 1708 lf->flags &= ~LINKER_FILE_MODULES; 1709 lf->userrefs++; /* so we can (try to) kldunload it */ 1710 } 1711 sx_xunlock(&kld_sx); 1712 } 1713 1714 /* 1715 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be 1716 * scheduled at any subsystem and order, so run this as late as possible. init 1717 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that. 1718 */ 1719 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE, 1720 linker_preload_finish, 0); 1721 1722 /* 1723 * Search for a not-loaded module by name. 1724 * 1725 * Modules may be found in the following locations: 1726 * 1727 * - preloaded (result is just the module name) - on disk (result is full path 1728 * to module) 1729 * 1730 * If the module name is qualified in any way (contains path, etc.) the we 1731 * simply return a copy of it. 1732 * 1733 * The search path can be manipulated via sysctl. Note that we use the ';' 1734 * character as a separator to be consistent with the bootloader. 1735 */ 1736 1737 static char linker_hintfile[] = "linker.hints"; 1738 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1739 1740 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path, 1741 sizeof(linker_path), "module load search path"); 1742 1743 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1744 1745 static char *linker_ext_list[] = { 1746 "", 1747 ".ko", 1748 NULL 1749 }; 1750 1751 /* 1752 * Check if file actually exists either with or without extension listed in 1753 * the linker_ext_list. (probably should be generic for the rest of the 1754 * kernel) 1755 */ 1756 static char * 1757 linker_lookup_file(const char *path, int pathlen, const char *name, 1758 int namelen, struct vattr *vap) 1759 { 1760 struct nameidata nd; 1761 struct thread *td = curthread; /* XXX */ 1762 char *result, **cpp, *sep; 1763 int error, len, extlen, reclen, flags; 1764 enum vtype type; 1765 1766 extlen = 0; 1767 for (cpp = linker_ext_list; *cpp; cpp++) { 1768 len = strlen(*cpp); 1769 if (len > extlen) 1770 extlen = len; 1771 } 1772 extlen++; /* trailing '\0' */ 1773 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1774 1775 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1776 result = malloc(reclen, M_LINKER, M_WAITOK); 1777 for (cpp = linker_ext_list; *cpp; cpp++) { 1778 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1779 namelen, name, *cpp); 1780 /* 1781 * Attempt to open the file, and return the path if 1782 * we succeed and it's a regular file. 1783 */ 1784 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1785 flags = FREAD; 1786 error = vn_open(&nd, &flags, 0, NULL); 1787 if (error == 0) { 1788 NDFREE(&nd, NDF_ONLY_PNBUF); 1789 type = nd.ni_vp->v_type; 1790 if (vap) 1791 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1792 VOP_UNLOCK(nd.ni_vp, 0); 1793 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1794 if (type == VREG) 1795 return (result); 1796 } 1797 } 1798 free(result, M_LINKER); 1799 return (NULL); 1800 } 1801 1802 #define INT_ALIGN(base, ptr) ptr = \ 1803 (base) + roundup2((ptr) - (base), sizeof(int)) 1804 1805 /* 1806 * Lookup KLD which contains requested module in the "linker.hints" file. If 1807 * version specification is available, then try to find the best KLD. 1808 * Otherwise just find the latest one. 1809 */ 1810 static char * 1811 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1812 int modnamelen, const struct mod_depend *verinfo) 1813 { 1814 struct thread *td = curthread; /* XXX */ 1815 struct ucred *cred = td ? td->td_ucred : NULL; 1816 struct nameidata nd; 1817 struct vattr vattr, mattr; 1818 u_char *hints = NULL; 1819 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1820 int error, ival, bestver, *intp, found, flags, clen, blen; 1821 ssize_t reclen; 1822 1823 result = NULL; 1824 bestver = found = 0; 1825 1826 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1827 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1828 strlen(sep) + 1; 1829 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1830 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1831 linker_hintfile); 1832 1833 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1834 flags = FREAD; 1835 error = vn_open(&nd, &flags, 0, NULL); 1836 if (error) 1837 goto bad; 1838 NDFREE(&nd, NDF_ONLY_PNBUF); 1839 if (nd.ni_vp->v_type != VREG) 1840 goto bad; 1841 best = cp = NULL; 1842 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1843 if (error) 1844 goto bad; 1845 /* 1846 * XXX: we need to limit this number to some reasonable value 1847 */ 1848 if (vattr.va_size > LINKER_HINTS_MAX) { 1849 printf("hints file too large %ld\n", (long)vattr.va_size); 1850 goto bad; 1851 } 1852 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1853 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1854 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1855 if (error) 1856 goto bad; 1857 VOP_UNLOCK(nd.ni_vp, 0); 1858 vn_close(nd.ni_vp, FREAD, cred, td); 1859 nd.ni_vp = NULL; 1860 if (reclen != 0) { 1861 printf("can't read %zd\n", reclen); 1862 goto bad; 1863 } 1864 intp = (int *)hints; 1865 ival = *intp++; 1866 if (ival != LINKER_HINTS_VERSION) { 1867 printf("hints file version mismatch %d\n", ival); 1868 goto bad; 1869 } 1870 bufend = hints + vattr.va_size; 1871 recptr = (u_char *)intp; 1872 clen = blen = 0; 1873 while (recptr < bufend && !found) { 1874 intp = (int *)recptr; 1875 reclen = *intp++; 1876 ival = *intp++; 1877 cp = (char *)intp; 1878 switch (ival) { 1879 case MDT_VERSION: 1880 clen = *cp++; 1881 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1882 break; 1883 cp += clen; 1884 INT_ALIGN(hints, cp); 1885 ival = *(int *)cp; 1886 cp += sizeof(int); 1887 clen = *cp++; 1888 if (verinfo == NULL || 1889 ival == verinfo->md_ver_preferred) { 1890 found = 1; 1891 break; 1892 } 1893 if (ival >= verinfo->md_ver_minimum && 1894 ival <= verinfo->md_ver_maximum && 1895 ival > bestver) { 1896 bestver = ival; 1897 best = cp; 1898 blen = clen; 1899 } 1900 break; 1901 default: 1902 break; 1903 } 1904 recptr += reclen + sizeof(int); 1905 } 1906 /* 1907 * Finally check if KLD is in the place 1908 */ 1909 if (found) 1910 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1911 else if (best) 1912 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1913 1914 /* 1915 * KLD is newer than hints file. What we should do now? 1916 */ 1917 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1918 printf("warning: KLD '%s' is newer than the linker.hints" 1919 " file\n", result); 1920 bad: 1921 free(pathbuf, M_LINKER); 1922 if (hints) 1923 free(hints, M_TEMP); 1924 if (nd.ni_vp != NULL) { 1925 VOP_UNLOCK(nd.ni_vp, 0); 1926 vn_close(nd.ni_vp, FREAD, cred, td); 1927 } 1928 /* 1929 * If nothing found or hints is absent - fallback to the old 1930 * way by using "kldname[.ko]" as module name. 1931 */ 1932 if (!found && !bestver && result == NULL) 1933 result = linker_lookup_file(path, pathlen, modname, 1934 modnamelen, NULL); 1935 return (result); 1936 } 1937 1938 /* 1939 * Lookup KLD which contains requested module in the all directories. 1940 */ 1941 static char * 1942 linker_search_module(const char *modname, int modnamelen, 1943 const struct mod_depend *verinfo) 1944 { 1945 char *cp, *ep, *result; 1946 1947 /* 1948 * traverse the linker path 1949 */ 1950 for (cp = linker_path; *cp; cp = ep + 1) { 1951 /* find the end of this component */ 1952 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1953 result = linker_hints_lookup(cp, ep - cp, modname, 1954 modnamelen, verinfo); 1955 if (result != NULL) 1956 return (result); 1957 if (*ep == 0) 1958 break; 1959 } 1960 return (NULL); 1961 } 1962 1963 /* 1964 * Search for module in all directories listed in the linker_path. 1965 */ 1966 static char * 1967 linker_search_kld(const char *name) 1968 { 1969 char *cp, *ep, *result; 1970 int len; 1971 1972 /* qualified at all? */ 1973 if (strchr(name, '/')) 1974 return (strdup(name, M_LINKER)); 1975 1976 /* traverse the linker path */ 1977 len = strlen(name); 1978 for (ep = linker_path; *ep; ep++) { 1979 cp = ep; 1980 /* find the end of this component */ 1981 for (; *ep != 0 && *ep != ';'; ep++); 1982 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 1983 if (result != NULL) 1984 return (result); 1985 } 1986 return (NULL); 1987 } 1988 1989 static const char * 1990 linker_basename(const char *path) 1991 { 1992 const char *filename; 1993 1994 filename = strrchr(path, '/'); 1995 if (filename == NULL) 1996 return path; 1997 if (filename[1]) 1998 filename++; 1999 return (filename); 2000 } 2001 2002 #ifdef HWPMC_HOOKS 2003 /* 2004 * Inform hwpmc about the set of kernel modules currently loaded. 2005 */ 2006 void * 2007 linker_hwpmc_list_objects(void) 2008 { 2009 linker_file_t lf; 2010 struct pmckern_map_in *kobase; 2011 int i, nmappings; 2012 2013 nmappings = 0; 2014 sx_slock(&kld_sx); 2015 TAILQ_FOREACH(lf, &linker_files, link) 2016 nmappings++; 2017 2018 /* Allocate nmappings + 1 entries. */ 2019 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 2020 M_LINKER, M_WAITOK | M_ZERO); 2021 i = 0; 2022 TAILQ_FOREACH(lf, &linker_files, link) { 2023 2024 /* Save the info for this linker file. */ 2025 kobase[i].pm_file = lf->filename; 2026 kobase[i].pm_address = (uintptr_t)lf->address; 2027 i++; 2028 } 2029 sx_sunlock(&kld_sx); 2030 2031 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 2032 2033 /* The last entry of the malloced area comprises of all zeros. */ 2034 KASSERT(kobase[i].pm_file == NULL, 2035 ("linker_hwpmc_list_objects: last object not NULL")); 2036 2037 return ((void *)kobase); 2038 } 2039 #endif 2040 2041 /* 2042 * Find a file which contains given module and load it, if "parent" is not 2043 * NULL, register a reference to it. 2044 */ 2045 static int 2046 linker_load_module(const char *kldname, const char *modname, 2047 struct linker_file *parent, const struct mod_depend *verinfo, 2048 struct linker_file **lfpp) 2049 { 2050 linker_file_t lfdep; 2051 const char *filename; 2052 char *pathname; 2053 int error; 2054 2055 sx_assert(&kld_sx, SA_XLOCKED); 2056 if (modname == NULL) { 2057 /* 2058 * We have to load KLD 2059 */ 2060 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 2061 " is not NULL")); 2062 pathname = linker_search_kld(kldname); 2063 } else { 2064 if (modlist_lookup2(modname, verinfo) != NULL) 2065 return (EEXIST); 2066 if (kldname != NULL) 2067 pathname = strdup(kldname, M_LINKER); 2068 else if (rootvnode == NULL) 2069 pathname = NULL; 2070 else 2071 /* 2072 * Need to find a KLD with required module 2073 */ 2074 pathname = linker_search_module(modname, 2075 strlen(modname), verinfo); 2076 } 2077 if (pathname == NULL) 2078 return (ENOENT); 2079 2080 /* 2081 * Can't load more than one file with the same basename XXX: 2082 * Actually it should be possible to have multiple KLDs with 2083 * the same basename but different path because they can 2084 * provide different versions of the same modules. 2085 */ 2086 filename = linker_basename(pathname); 2087 if (linker_find_file_by_name(filename)) 2088 error = EEXIST; 2089 else do { 2090 error = linker_load_file(pathname, &lfdep); 2091 if (error) 2092 break; 2093 if (modname && verinfo && 2094 modlist_lookup2(modname, verinfo) == NULL) { 2095 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2096 error = ENOENT; 2097 break; 2098 } 2099 if (parent) { 2100 error = linker_file_add_dependency(parent, lfdep); 2101 if (error) 2102 break; 2103 } 2104 if (lfpp) 2105 *lfpp = lfdep; 2106 } while (0); 2107 free(pathname, M_LINKER); 2108 return (error); 2109 } 2110 2111 /* 2112 * This routine is responsible for finding dependencies of userland initiated 2113 * kldload(2)'s of files. 2114 */ 2115 int 2116 linker_load_dependencies(linker_file_t lf) 2117 { 2118 linker_file_t lfdep; 2119 struct mod_metadata **start, **stop, **mdp, **nmdp; 2120 struct mod_metadata *mp, *nmp; 2121 const struct mod_depend *verinfo; 2122 modlist_t mod; 2123 const char *modname, *nmodname; 2124 int ver, error = 0, count; 2125 2126 /* 2127 * All files are dependent on /kernel. 2128 */ 2129 sx_assert(&kld_sx, SA_XLOCKED); 2130 if (linker_kernel_file) { 2131 linker_kernel_file->refs++; 2132 error = linker_file_add_dependency(lf, linker_kernel_file); 2133 if (error) 2134 return (error); 2135 } 2136 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2137 &count) != 0) 2138 return (0); 2139 for (mdp = start; mdp < stop; mdp++) { 2140 mp = *mdp; 2141 if (mp->md_type != MDT_VERSION) 2142 continue; 2143 modname = mp->md_cval; 2144 ver = ((const struct mod_version *)mp->md_data)->mv_version; 2145 mod = modlist_lookup(modname, ver); 2146 if (mod != NULL) { 2147 printf("interface %s.%d already present in the KLD" 2148 " '%s'!\n", modname, ver, 2149 mod->container->filename); 2150 return (EEXIST); 2151 } 2152 } 2153 2154 for (mdp = start; mdp < stop; mdp++) { 2155 mp = *mdp; 2156 if (mp->md_type != MDT_DEPEND) 2157 continue; 2158 modname = mp->md_cval; 2159 verinfo = mp->md_data; 2160 nmodname = NULL; 2161 for (nmdp = start; nmdp < stop; nmdp++) { 2162 nmp = *nmdp; 2163 if (nmp->md_type != MDT_VERSION) 2164 continue; 2165 nmodname = nmp->md_cval; 2166 if (strcmp(modname, nmodname) == 0) 2167 break; 2168 } 2169 if (nmdp < stop)/* early exit, it's a self reference */ 2170 continue; 2171 mod = modlist_lookup2(modname, verinfo); 2172 if (mod) { /* woohoo, it's loaded already */ 2173 lfdep = mod->container; 2174 lfdep->refs++; 2175 error = linker_file_add_dependency(lf, lfdep); 2176 if (error) 2177 break; 2178 continue; 2179 } 2180 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2181 if (error) { 2182 printf("KLD %s: depends on %s - not available or" 2183 " version mismatch\n", lf->filename, modname); 2184 break; 2185 } 2186 } 2187 2188 if (error) 2189 return (error); 2190 linker_addmodules(lf, start, stop, 0); 2191 return (error); 2192 } 2193 2194 static int 2195 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2196 { 2197 struct sysctl_req *req; 2198 2199 req = opaque; 2200 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2201 } 2202 2203 /* 2204 * Export a nul-separated, double-nul-terminated list of all function names 2205 * in the kernel. 2206 */ 2207 static int 2208 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2209 { 2210 linker_file_t lf; 2211 int error; 2212 2213 #ifdef MAC 2214 error = mac_kld_check_stat(req->td->td_ucred); 2215 if (error) 2216 return (error); 2217 #endif 2218 error = sysctl_wire_old_buffer(req, 0); 2219 if (error != 0) 2220 return (error); 2221 sx_xlock(&kld_sx); 2222 TAILQ_FOREACH(lf, &linker_files, link) { 2223 error = LINKER_EACH_FUNCTION_NAME(lf, 2224 sysctl_kern_function_list_iterate, req); 2225 if (error) { 2226 sx_xunlock(&kld_sx); 2227 return (error); 2228 } 2229 } 2230 sx_xunlock(&kld_sx); 2231 return (SYSCTL_OUT(req, "", 1)); 2232 } 2233 2234 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD, 2235 NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 2236