1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1997-2000 Doug Rabson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_ddb.h" 33 #include "opt_kld.h" 34 #include "opt_hwpmc_hooks.h" 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/sysproto.h> 41 #include <sys/sysent.h> 42 #include <sys/priv.h> 43 #include <sys/proc.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/sx.h> 47 #include <sys/module.h> 48 #include <sys/mount.h> 49 #include <sys/linker.h> 50 #include <sys/eventhandler.h> 51 #include <sys/fcntl.h> 52 #include <sys/jail.h> 53 #include <sys/libkern.h> 54 #include <sys/namei.h> 55 #include <sys/vnode.h> 56 #include <sys/syscallsubr.h> 57 #include <sys/sysctl.h> 58 59 #ifdef DDB 60 #include <ddb/ddb.h> 61 #endif 62 63 #include <net/vnet.h> 64 65 #include <security/mac/mac_framework.h> 66 67 #include "linker_if.h" 68 69 #ifdef HWPMC_HOOKS 70 #include <sys/pmckern.h> 71 #endif 72 73 #ifdef KLD_DEBUG 74 int kld_debug = 0; 75 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RWTUN, 76 &kld_debug, 0, "Set various levels of KLD debug"); 77 #endif 78 79 /* These variables are used by kernel debuggers to enumerate loaded files. */ 80 const int kld_off_address = offsetof(struct linker_file, address); 81 const int kld_off_filename = offsetof(struct linker_file, filename); 82 const int kld_off_pathname = offsetof(struct linker_file, pathname); 83 const int kld_off_next = offsetof(struct linker_file, link.tqe_next); 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 static bool kld_busy; 110 111 /* 112 * Load counter used by clients to determine if a linker file has been 113 * re-loaded. This counter is incremented for each file load. 114 */ 115 static int loadcnt; 116 117 static linker_class_list_t classes; 118 static linker_file_list_t linker_files; 119 static int next_file_id = 1; 120 static int linker_no_more_classes = 0; 121 122 #define LINKER_GET_NEXT_FILE_ID(a) do { \ 123 linker_file_t lftmp; \ 124 \ 125 if (!cold) \ 126 sx_assert(&kld_sx, SA_XLOCKED); \ 127 retry: \ 128 TAILQ_FOREACH(lftmp, &linker_files, link) { \ 129 if (next_file_id == lftmp->id) { \ 130 next_file_id++; \ 131 goto retry; \ 132 } \ 133 } \ 134 (a) = next_file_id; \ 135 } while (0) 136 137 /* XXX wrong name; we're looking at version provision tags here, not modules */ 138 typedef TAILQ_HEAD(, modlist) modlisthead_t; 139 struct modlist { 140 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 141 linker_file_t container; 142 const char *name; 143 int version; 144 }; 145 typedef struct modlist *modlist_t; 146 static modlisthead_t found_modules; 147 148 static int linker_file_add_dependency(linker_file_t file, 149 linker_file_t dep); 150 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file, 151 const char* name, int deps); 152 static int linker_load_module(const char *kldname, 153 const char *modname, struct linker_file *parent, 154 const struct mod_depend *verinfo, struct linker_file **lfpp); 155 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo); 156 157 static void 158 linker_init(void *arg) 159 { 160 161 sx_init(&kld_sx, "kernel linker"); 162 TAILQ_INIT(&classes); 163 TAILQ_INIT(&linker_files); 164 } 165 166 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, NULL); 167 168 static void 169 linker_stop_class_add(void *arg) 170 { 171 172 linker_no_more_classes = 1; 173 } 174 175 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL); 176 177 int 178 linker_add_class(linker_class_t lc) 179 { 180 181 /* 182 * We disallow any class registration past SI_ORDER_ANY 183 * of SI_SUB_KLD. We bump the reference count to keep the 184 * ops from being freed. 185 */ 186 if (linker_no_more_classes == 1) 187 return (EPERM); 188 kobj_class_compile((kobj_class_t) lc); 189 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */ 190 TAILQ_INSERT_TAIL(&classes, lc, link); 191 return (0); 192 } 193 194 static void 195 linker_file_sysinit(linker_file_t lf) 196 { 197 struct sysinit **start, **stop, **sipp, **xipp, *save; 198 199 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 200 lf->filename)); 201 202 sx_assert(&kld_sx, SA_XLOCKED); 203 204 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 205 return; 206 /* 207 * Perform a bubble sort of the system initialization objects by 208 * their subsystem (primary key) and order (secondary key). 209 * 210 * Since some things care about execution order, this is the operation 211 * which ensures continued function. 212 */ 213 for (sipp = start; sipp < stop; sipp++) { 214 for (xipp = sipp + 1; xipp < stop; xipp++) { 215 if ((*sipp)->subsystem < (*xipp)->subsystem || 216 ((*sipp)->subsystem == (*xipp)->subsystem && 217 (*sipp)->order <= (*xipp)->order)) 218 continue; /* skip */ 219 save = *sipp; 220 *sipp = *xipp; 221 *xipp = save; 222 } 223 } 224 225 /* 226 * Traverse the (now) ordered list of system initialization tasks. 227 * Perform each task, and continue on to the next task. 228 */ 229 sx_xunlock(&kld_sx); 230 mtx_lock(&Giant); 231 for (sipp = start; sipp < stop; sipp++) { 232 if ((*sipp)->subsystem == SI_SUB_DUMMY) 233 continue; /* skip dummy task(s) */ 234 235 /* Call function */ 236 (*((*sipp)->func)) ((*sipp)->udata); 237 } 238 mtx_unlock(&Giant); 239 sx_xlock(&kld_sx); 240 } 241 242 static void 243 linker_file_sysuninit(linker_file_t lf) 244 { 245 struct sysinit **start, **stop, **sipp, **xipp, *save; 246 247 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 248 lf->filename)); 249 250 sx_assert(&kld_sx, SA_XLOCKED); 251 252 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 253 NULL) != 0) 254 return; 255 256 /* 257 * Perform a reverse bubble sort of the system initialization objects 258 * by their subsystem (primary key) and order (secondary key). 259 * 260 * Since some things care about execution order, this is the operation 261 * which ensures continued function. 262 */ 263 for (sipp = start; sipp < stop; sipp++) { 264 for (xipp = sipp + 1; xipp < stop; xipp++) { 265 if ((*sipp)->subsystem > (*xipp)->subsystem || 266 ((*sipp)->subsystem == (*xipp)->subsystem && 267 (*sipp)->order >= (*xipp)->order)) 268 continue; /* skip */ 269 save = *sipp; 270 *sipp = *xipp; 271 *xipp = save; 272 } 273 } 274 275 /* 276 * Traverse the (now) ordered list of system initialization tasks. 277 * Perform each task, and continue on to the next task. 278 */ 279 sx_xunlock(&kld_sx); 280 mtx_lock(&Giant); 281 for (sipp = start; sipp < stop; sipp++) { 282 if ((*sipp)->subsystem == SI_SUB_DUMMY) 283 continue; /* skip dummy task(s) */ 284 285 /* Call function */ 286 (*((*sipp)->func)) ((*sipp)->udata); 287 } 288 mtx_unlock(&Giant); 289 sx_xlock(&kld_sx); 290 } 291 292 static void 293 linker_file_register_sysctls(linker_file_t lf, bool enable) 294 { 295 struct sysctl_oid **start, **stop, **oidp; 296 297 KLD_DPF(FILE, 298 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 299 lf->filename)); 300 301 sx_assert(&kld_sx, SA_XLOCKED); 302 303 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 304 return; 305 306 sx_xunlock(&kld_sx); 307 sysctl_wlock(); 308 for (oidp = start; oidp < stop; oidp++) { 309 if (enable) 310 sysctl_register_oid(*oidp); 311 else 312 sysctl_register_disabled_oid(*oidp); 313 } 314 sysctl_wunlock(); 315 sx_xlock(&kld_sx); 316 } 317 318 static void 319 linker_file_enable_sysctls(linker_file_t lf) 320 { 321 struct sysctl_oid **start, **stop, **oidp; 322 323 KLD_DPF(FILE, 324 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n", 325 lf->filename)); 326 327 sx_assert(&kld_sx, SA_XLOCKED); 328 329 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 330 return; 331 332 sx_xunlock(&kld_sx); 333 sysctl_wlock(); 334 for (oidp = start; oidp < stop; oidp++) 335 sysctl_enable_oid(*oidp); 336 sysctl_wunlock(); 337 sx_xlock(&kld_sx); 338 } 339 340 static void 341 linker_file_unregister_sysctls(linker_file_t lf) 342 { 343 struct sysctl_oid **start, **stop, **oidp; 344 345 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs" 346 " for %s\n", lf->filename)); 347 348 sx_assert(&kld_sx, SA_XLOCKED); 349 350 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 351 return; 352 353 sx_xunlock(&kld_sx); 354 sysctl_wlock(); 355 for (oidp = start; oidp < stop; oidp++) 356 sysctl_unregister_oid(*oidp); 357 sysctl_wunlock(); 358 sx_xlock(&kld_sx); 359 } 360 361 static int 362 linker_file_register_modules(linker_file_t lf) 363 { 364 struct mod_metadata **start, **stop, **mdp; 365 const moduledata_t *moddata; 366 int first_error, error; 367 368 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 369 " in %s\n", lf->filename)); 370 371 sx_assert(&kld_sx, SA_XLOCKED); 372 373 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL) != 0) { 374 /* 375 * This fallback should be unnecessary, but if we get booted 376 * from boot2 instead of loader and we are missing our 377 * metadata then we have to try the best we can. 378 */ 379 if (lf == linker_kernel_file) { 380 start = SET_BEGIN(modmetadata_set); 381 stop = SET_LIMIT(modmetadata_set); 382 } else 383 return (0); 384 } 385 first_error = 0; 386 for (mdp = start; mdp < stop; mdp++) { 387 if ((*mdp)->md_type != MDT_MODULE) 388 continue; 389 moddata = (*mdp)->md_data; 390 KLD_DPF(FILE, ("Registering module %s in %s\n", 391 moddata->name, lf->filename)); 392 error = module_register(moddata, lf); 393 if (error) { 394 printf("Module %s failed to register: %d\n", 395 moddata->name, error); 396 if (first_error == 0) 397 first_error = error; 398 } 399 } 400 return (first_error); 401 } 402 403 static void 404 linker_init_kernel_modules(void) 405 { 406 407 sx_xlock(&kld_sx); 408 linker_file_register_modules(linker_kernel_file); 409 sx_xunlock(&kld_sx); 410 } 411 412 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 413 NULL); 414 415 static int 416 linker_load_file(const char *filename, linker_file_t *result) 417 { 418 linker_class_t lc; 419 linker_file_t lf; 420 int foundfile, error, modules; 421 422 /* Refuse to load modules if securelevel raised */ 423 if (prison0.pr_securelevel > 0) 424 return (EPERM); 425 426 sx_assert(&kld_sx, SA_XLOCKED); 427 lf = linker_find_file_by_name(filename); 428 if (lf) { 429 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 430 " incrementing refs\n", filename)); 431 *result = lf; 432 lf->refs++; 433 return (0); 434 } 435 foundfile = 0; 436 error = 0; 437 438 /* 439 * We do not need to protect (lock) classes here because there is 440 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 441 * and there is no class deregistration mechanism at this time. 442 */ 443 TAILQ_FOREACH(lc, &classes, link) { 444 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 445 filename)); 446 error = LINKER_LOAD_FILE(lc, filename, &lf); 447 /* 448 * If we got something other than ENOENT, then it exists but 449 * we cannot load it for some other reason. 450 */ 451 if (error != ENOENT) 452 foundfile = 1; 453 if (lf) { 454 error = linker_file_register_modules(lf); 455 if (error == EEXIST) { 456 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 457 return (error); 458 } 459 modules = !TAILQ_EMPTY(&lf->modules); 460 linker_file_register_sysctls(lf, false); 461 linker_file_sysinit(lf); 462 lf->flags |= LINKER_FILE_LINKED; 463 464 /* 465 * If all of the modules in this file failed 466 * to load, unload the file and return an 467 * error of ENOEXEC. 468 */ 469 if (modules && TAILQ_EMPTY(&lf->modules)) { 470 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 471 return (ENOEXEC); 472 } 473 linker_file_enable_sysctls(lf); 474 EVENTHANDLER_INVOKE(kld_load, lf); 475 *result = lf; 476 return (0); 477 } 478 } 479 /* 480 * Less than ideal, but tells the user whether it failed to load or 481 * the module was not found. 482 */ 483 if (foundfile) { 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 #ifdef __arm__ 626 lf->exidx_addr = 0; 627 lf->exidx_size = 0; 628 #endif 629 STAILQ_INIT(&lf->common); 630 TAILQ_INIT(&lf->modules); 631 TAILQ_INSERT_TAIL(&linker_files, lf, link); 632 return (lf); 633 } 634 635 int 636 linker_file_unload(linker_file_t file, int flags) 637 { 638 module_t mod, next; 639 modlist_t ml, nextml; 640 struct common_symbol *cp; 641 int error, i; 642 643 /* Refuse to unload modules if securelevel raised. */ 644 if (prison0.pr_securelevel > 0) 645 return (EPERM); 646 647 sx_assert(&kld_sx, SA_XLOCKED); 648 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 649 650 /* Easy case of just dropping a reference. */ 651 if (file->refs > 1) { 652 file->refs--; 653 return (0); 654 } 655 656 /* Give eventhandlers a chance to prevent the unload. */ 657 error = 0; 658 EVENTHANDLER_INVOKE(kld_unload_try, file, &error); 659 if (error != 0) 660 return (EBUSY); 661 662 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 663 " informing modules\n")); 664 665 /* 666 * Quiesce all the modules to give them a chance to veto the unload. 667 */ 668 MOD_SLOCK; 669 for (mod = TAILQ_FIRST(&file->modules); mod; 670 mod = module_getfnext(mod)) { 671 error = module_quiesce(mod); 672 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 673 KLD_DPF(FILE, ("linker_file_unload: module %s" 674 " vetoed unload\n", module_getname(mod))); 675 /* 676 * XXX: Do we need to tell all the quiesced modules 677 * that they can resume work now via a new module 678 * event? 679 */ 680 MOD_SUNLOCK; 681 return (error); 682 } 683 } 684 MOD_SUNLOCK; 685 686 /* 687 * Inform any modules associated with this file that they are 688 * being unloaded. 689 */ 690 MOD_XLOCK; 691 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 692 next = module_getfnext(mod); 693 MOD_XUNLOCK; 694 695 /* 696 * Give the module a chance to veto the unload. 697 */ 698 if ((error = module_unload(mod)) != 0) { 699 #ifdef KLD_DEBUG 700 MOD_SLOCK; 701 KLD_DPF(FILE, ("linker_file_unload: module %s" 702 " failed unload\n", module_getname(mod))); 703 MOD_SUNLOCK; 704 #endif 705 return (error); 706 } 707 MOD_XLOCK; 708 module_release(mod); 709 } 710 MOD_XUNLOCK; 711 712 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 713 if (ml->container == file) { 714 TAILQ_REMOVE(&found_modules, ml, link); 715 free(ml, M_LINKER); 716 } 717 } 718 719 /* 720 * Don't try to run SYSUNINITs if we are unloaded due to a 721 * link error. 722 */ 723 if (file->flags & LINKER_FILE_LINKED) { 724 file->flags &= ~LINKER_FILE_LINKED; 725 linker_file_unregister_sysctls(file); 726 linker_file_sysuninit(file); 727 } 728 TAILQ_REMOVE(&linker_files, file, link); 729 730 if (file->deps) { 731 for (i = 0; i < file->ndeps; i++) 732 linker_file_unload(file->deps[i], flags); 733 free(file->deps, M_LINKER); 734 file->deps = NULL; 735 } 736 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 737 STAILQ_REMOVE_HEAD(&file->common, link); 738 free(cp, M_LINKER); 739 } 740 741 LINKER_UNLOAD(file); 742 743 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address, 744 file->size); 745 746 if (file->filename) { 747 free(file->filename, M_LINKER); 748 file->filename = NULL; 749 } 750 if (file->pathname) { 751 free(file->pathname, M_LINKER); 752 file->pathname = NULL; 753 } 754 kobj_delete((kobj_t) file, M_LINKER); 755 return (0); 756 } 757 758 int 759 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 760 { 761 return (LINKER_CTF_GET(file, lc)); 762 } 763 764 static int 765 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 766 { 767 linker_file_t *newdeps; 768 769 sx_assert(&kld_sx, SA_XLOCKED); 770 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps), 771 M_LINKER, M_WAITOK | M_ZERO); 772 file->deps[file->ndeps] = dep; 773 file->ndeps++; 774 KLD_DPF(FILE, ("linker_file_add_dependency:" 775 " adding %s as dependency for %s\n", 776 dep->filename, file->filename)); 777 return (0); 778 } 779 780 /* 781 * Locate a linker set and its contents. This is a helper function to avoid 782 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 783 * This function is used in this file so we can avoid having lots of (void **) 784 * casts. 785 */ 786 int 787 linker_file_lookup_set(linker_file_t file, const char *name, 788 void *firstp, void *lastp, int *countp) 789 { 790 791 sx_assert(&kld_sx, SA_LOCKED); 792 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 793 } 794 795 /* 796 * List all functions in a file. 797 */ 798 int 799 linker_file_function_listall(linker_file_t lf, 800 linker_function_nameval_callback_t callback_func, void *arg) 801 { 802 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 803 } 804 805 caddr_t 806 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 807 { 808 caddr_t sym; 809 int locked; 810 811 locked = sx_xlocked(&kld_sx); 812 if (!locked) 813 sx_xlock(&kld_sx); 814 sym = linker_file_lookup_symbol_internal(file, name, deps); 815 if (!locked) 816 sx_xunlock(&kld_sx); 817 return (sym); 818 } 819 820 static caddr_t 821 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 822 int deps) 823 { 824 c_linker_sym_t sym; 825 linker_symval_t symval; 826 caddr_t address; 827 size_t common_size = 0; 828 int i; 829 830 sx_assert(&kld_sx, SA_XLOCKED); 831 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 832 file, name, deps)); 833 834 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 835 LINKER_SYMBOL_VALUES(file, sym, &symval); 836 if (symval.value == 0) 837 /* 838 * For commons, first look them up in the 839 * dependencies and only allocate space if not found 840 * there. 841 */ 842 common_size = symval.size; 843 else { 844 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 845 ".value=%p\n", symval.value)); 846 return (symval.value); 847 } 848 } 849 if (deps) { 850 for (i = 0; i < file->ndeps; i++) { 851 address = linker_file_lookup_symbol_internal( 852 file->deps[i], name, 0); 853 if (address) { 854 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 855 " deps value=%p\n", address)); 856 return (address); 857 } 858 } 859 } 860 if (common_size > 0) { 861 /* 862 * This is a common symbol which was not found in the 863 * dependencies. We maintain a simple common symbol table in 864 * the file object. 865 */ 866 struct common_symbol *cp; 867 868 STAILQ_FOREACH(cp, &file->common, link) { 869 if (strcmp(cp->name, name) == 0) { 870 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 871 " old common value=%p\n", cp->address)); 872 return (cp->address); 873 } 874 } 875 /* 876 * Round the symbol size up to align. 877 */ 878 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 879 cp = malloc(sizeof(struct common_symbol) 880 + common_size + strlen(name) + 1, M_LINKER, 881 M_WAITOK | M_ZERO); 882 cp->address = (caddr_t)(cp + 1); 883 cp->name = cp->address + common_size; 884 strcpy(cp->name, name); 885 bzero(cp->address, common_size); 886 STAILQ_INSERT_TAIL(&file->common, cp, link); 887 888 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 889 " value=%p\n", cp->address)); 890 return (cp->address); 891 } 892 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 893 return (0); 894 } 895 896 /* 897 * Both DDB and stack(9) rely on the kernel linker to provide forward and 898 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 899 * do this in a lockfree manner. We provide a set of internal helper 900 * routines to perform these operations without locks, and then wrappers that 901 * optionally lock. 902 * 903 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 904 */ 905 #ifdef DDB 906 static int 907 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 908 { 909 linker_file_t lf; 910 911 TAILQ_FOREACH(lf, &linker_files, link) { 912 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 913 return (0); 914 } 915 return (ENOENT); 916 } 917 #endif 918 919 static int 920 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 921 { 922 linker_file_t lf; 923 c_linker_sym_t best, es; 924 u_long diff, bestdiff, off; 925 926 best = 0; 927 off = (uintptr_t)value; 928 bestdiff = off; 929 TAILQ_FOREACH(lf, &linker_files, link) { 930 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 931 continue; 932 if (es != 0 && diff < bestdiff) { 933 best = es; 934 bestdiff = diff; 935 } 936 if (bestdiff == 0) 937 break; 938 } 939 if (best) { 940 *sym = best; 941 *diffp = bestdiff; 942 return (0); 943 } else { 944 *sym = 0; 945 *diffp = off; 946 return (ENOENT); 947 } 948 } 949 950 static int 951 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 952 { 953 linker_file_t lf; 954 955 TAILQ_FOREACH(lf, &linker_files, link) { 956 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 957 return (0); 958 } 959 return (ENOENT); 960 } 961 962 static int 963 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 964 long *offset) 965 { 966 linker_symval_t symval; 967 c_linker_sym_t sym; 968 int error; 969 970 *offset = 0; 971 error = linker_debug_search_symbol(value, &sym, offset); 972 if (error) 973 return (error); 974 error = linker_debug_symbol_values(sym, &symval); 975 if (error) 976 return (error); 977 strlcpy(buf, symval.name, buflen); 978 return (0); 979 } 980 981 /* 982 * DDB Helpers. DDB has to look across multiple files with their own symbol 983 * tables and string tables. 984 * 985 * Note that we do not obey list locking protocols here. We really don't need 986 * DDB to hang because somebody's got the lock held. We'll take the chance 987 * that the files list is inconsistent instead. 988 */ 989 #ifdef DDB 990 int 991 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 992 { 993 994 return (linker_debug_lookup(symstr, sym)); 995 } 996 #endif 997 998 int 999 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 1000 { 1001 1002 return (linker_debug_search_symbol(value, sym, diffp)); 1003 } 1004 1005 int 1006 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 1007 { 1008 1009 return (linker_debug_symbol_values(sym, symval)); 1010 } 1011 1012 int 1013 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1014 long *offset) 1015 { 1016 1017 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 1018 } 1019 1020 /* 1021 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 1022 * obey locking protocols, and offer a significantly less complex interface. 1023 */ 1024 int 1025 linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen, 1026 long *offset, int flags) 1027 { 1028 int error; 1029 1030 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 && 1031 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK), 1032 ("%s: bad flags: 0x%x", __func__, flags)); 1033 1034 if (flags & M_NOWAIT) { 1035 if (!sx_try_slock(&kld_sx)) 1036 return (EWOULDBLOCK); 1037 } else 1038 sx_slock(&kld_sx); 1039 1040 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 1041 sx_sunlock(&kld_sx); 1042 return (error); 1043 } 1044 1045 int 1046 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1047 long *offset) 1048 { 1049 1050 return (linker_search_symbol_name_flags(value, buf, buflen, offset, 1051 M_WAITOK)); 1052 } 1053 1054 int 1055 linker_kldload_busy(int flags) 1056 { 1057 int error; 1058 1059 MPASS((flags & ~(LINKER_UB_UNLOCK | LINKER_UB_LOCKED | 1060 LINKER_UB_PCATCH)) == 0); 1061 if ((flags & LINKER_UB_LOCKED) != 0) 1062 sx_assert(&kld_sx, SA_XLOCKED); 1063 1064 if ((flags & LINKER_UB_LOCKED) == 0) 1065 sx_xlock(&kld_sx); 1066 while (kld_busy) { 1067 error = sx_sleep(&kld_busy, &kld_sx, 1068 (flags & LINKER_UB_PCATCH) != 0 ? PCATCH : 0, 1069 "kldbusy", 0); 1070 if (error != 0) { 1071 if ((flags & LINKER_UB_UNLOCK) != 0) 1072 sx_xunlock(&kld_sx); 1073 return (error); 1074 } 1075 } 1076 kld_busy = true; 1077 if ((flags & LINKER_UB_UNLOCK) != 0) 1078 sx_xunlock(&kld_sx); 1079 return (0); 1080 } 1081 1082 void 1083 linker_kldload_unbusy(int flags) 1084 { 1085 MPASS((flags & ~LINKER_UB_LOCKED) == 0); 1086 if ((flags & LINKER_UB_LOCKED) != 0) 1087 sx_assert(&kld_sx, SA_XLOCKED); 1088 1089 if ((flags & LINKER_UB_LOCKED) == 0) 1090 sx_xlock(&kld_sx); 1091 MPASS(kld_busy); 1092 kld_busy = false; 1093 wakeup(&kld_busy); 1094 sx_xunlock(&kld_sx); 1095 } 1096 1097 /* 1098 * Syscalls. 1099 */ 1100 int 1101 kern_kldload(struct thread *td, const char *file, int *fileid) 1102 { 1103 const char *kldname, *modname; 1104 linker_file_t lf; 1105 int error; 1106 1107 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1108 return (error); 1109 1110 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1111 return (error); 1112 1113 /* 1114 * If file does not contain a qualified name or any dot in it 1115 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1116 * name. 1117 */ 1118 if (strchr(file, '/') || strchr(file, '.')) { 1119 kldname = file; 1120 modname = NULL; 1121 } else { 1122 kldname = NULL; 1123 modname = file; 1124 } 1125 1126 error = linker_kldload_busy(LINKER_UB_PCATCH); 1127 if (error != 0) { 1128 sx_xunlock(&kld_sx); 1129 return (error); 1130 } 1131 1132 /* 1133 * It is possible that kldloaded module will attach a new ifnet, 1134 * so vnet context must be set when this ocurs. 1135 */ 1136 CURVNET_SET(TD_TO_VNET(td)); 1137 1138 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1139 CURVNET_RESTORE(); 1140 1141 if (error == 0) { 1142 lf->userrefs++; 1143 if (fileid != NULL) 1144 *fileid = lf->id; 1145 } 1146 linker_kldload_unbusy(LINKER_UB_LOCKED); 1147 return (error); 1148 } 1149 1150 int 1151 sys_kldload(struct thread *td, struct kldload_args *uap) 1152 { 1153 char *pathname = NULL; 1154 int error, fileid; 1155 1156 td->td_retval[0] = -1; 1157 1158 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1159 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1160 if (error == 0) { 1161 error = kern_kldload(td, pathname, &fileid); 1162 if (error == 0) 1163 td->td_retval[0] = fileid; 1164 } 1165 free(pathname, M_TEMP); 1166 return (error); 1167 } 1168 1169 int 1170 kern_kldunload(struct thread *td, int fileid, int flags) 1171 { 1172 linker_file_t lf; 1173 int error = 0; 1174 1175 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1176 return (error); 1177 1178 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1179 return (error); 1180 1181 error = linker_kldload_busy(LINKER_UB_PCATCH); 1182 if (error != 0) { 1183 sx_xunlock(&kld_sx); 1184 return (error); 1185 } 1186 1187 CURVNET_SET(TD_TO_VNET(td)); 1188 lf = linker_find_file_by_id(fileid); 1189 if (lf) { 1190 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1191 1192 if (lf->userrefs == 0) { 1193 /* 1194 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1195 */ 1196 printf("kldunload: attempt to unload file that was" 1197 " loaded by the kernel\n"); 1198 error = EBUSY; 1199 } else { 1200 lf->userrefs--; 1201 error = linker_file_unload(lf, flags); 1202 if (error) 1203 lf->userrefs++; 1204 } 1205 } else 1206 error = ENOENT; 1207 CURVNET_RESTORE(); 1208 linker_kldload_unbusy(LINKER_UB_LOCKED); 1209 return (error); 1210 } 1211 1212 int 1213 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1214 { 1215 1216 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1217 } 1218 1219 int 1220 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1221 { 1222 1223 if (uap->flags != LINKER_UNLOAD_NORMAL && 1224 uap->flags != LINKER_UNLOAD_FORCE) 1225 return (EINVAL); 1226 return (kern_kldunload(td, uap->fileid, uap->flags)); 1227 } 1228 1229 int 1230 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1231 { 1232 char *pathname; 1233 const char *filename; 1234 linker_file_t lf; 1235 int error; 1236 1237 #ifdef MAC 1238 error = mac_kld_check_stat(td->td_ucred); 1239 if (error) 1240 return (error); 1241 #endif 1242 1243 td->td_retval[0] = -1; 1244 1245 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1246 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1247 goto out; 1248 1249 filename = linker_basename(pathname); 1250 sx_xlock(&kld_sx); 1251 lf = linker_find_file_by_name(filename); 1252 if (lf) 1253 td->td_retval[0] = lf->id; 1254 else 1255 error = ENOENT; 1256 sx_xunlock(&kld_sx); 1257 out: 1258 free(pathname, M_TEMP); 1259 return (error); 1260 } 1261 1262 int 1263 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1264 { 1265 linker_file_t lf; 1266 int error = 0; 1267 1268 #ifdef MAC 1269 error = mac_kld_check_stat(td->td_ucred); 1270 if (error) 1271 return (error); 1272 #endif 1273 1274 sx_xlock(&kld_sx); 1275 if (uap->fileid == 0) 1276 lf = TAILQ_FIRST(&linker_files); 1277 else { 1278 lf = linker_find_file_by_id(uap->fileid); 1279 if (lf == NULL) { 1280 error = ENOENT; 1281 goto out; 1282 } 1283 lf = TAILQ_NEXT(lf, link); 1284 } 1285 1286 /* Skip partially loaded files. */ 1287 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1288 lf = TAILQ_NEXT(lf, link); 1289 1290 if (lf) 1291 td->td_retval[0] = lf->id; 1292 else 1293 td->td_retval[0] = 0; 1294 out: 1295 sx_xunlock(&kld_sx); 1296 return (error); 1297 } 1298 1299 int 1300 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1301 { 1302 struct kld_file_stat *stat; 1303 int error, version; 1304 1305 /* 1306 * Check the version of the user's structure. 1307 */ 1308 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1309 != 0) 1310 return (error); 1311 if (version != sizeof(struct kld_file_stat_1) && 1312 version != sizeof(struct kld_file_stat)) 1313 return (EINVAL); 1314 1315 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO); 1316 error = kern_kldstat(td, uap->fileid, stat); 1317 if (error == 0) 1318 error = copyout(stat, uap->stat, version); 1319 free(stat, M_TEMP); 1320 return (error); 1321 } 1322 1323 int 1324 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat) 1325 { 1326 linker_file_t lf; 1327 int namelen; 1328 #ifdef MAC 1329 int error; 1330 1331 error = mac_kld_check_stat(td->td_ucred); 1332 if (error) 1333 return (error); 1334 #endif 1335 1336 sx_xlock(&kld_sx); 1337 lf = linker_find_file_by_id(fileid); 1338 if (lf == NULL) { 1339 sx_xunlock(&kld_sx); 1340 return (ENOENT); 1341 } 1342 1343 /* Version 1 fields: */ 1344 namelen = strlen(lf->filename) + 1; 1345 if (namelen > sizeof(stat->name)) 1346 namelen = sizeof(stat->name); 1347 bcopy(lf->filename, &stat->name[0], namelen); 1348 stat->refs = lf->refs; 1349 stat->id = lf->id; 1350 stat->address = lf->address; 1351 stat->size = lf->size; 1352 /* Version 2 fields: */ 1353 namelen = strlen(lf->pathname) + 1; 1354 if (namelen > sizeof(stat->pathname)) 1355 namelen = sizeof(stat->pathname); 1356 bcopy(lf->pathname, &stat->pathname[0], namelen); 1357 sx_xunlock(&kld_sx); 1358 1359 td->td_retval[0] = 0; 1360 return (0); 1361 } 1362 1363 #ifdef DDB 1364 DB_COMMAND(kldstat, db_kldstat) 1365 { 1366 linker_file_t lf; 1367 1368 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2)) 1369 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' '); 1370 #undef POINTER_WIDTH 1371 TAILQ_FOREACH(lf, &linker_files, link) { 1372 if (db_pager_quit) 1373 return; 1374 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs, 1375 lf->address, lf->size, lf->filename); 1376 } 1377 } 1378 #endif /* DDB */ 1379 1380 int 1381 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1382 { 1383 linker_file_t lf; 1384 module_t mp; 1385 int error = 0; 1386 1387 #ifdef MAC 1388 error = mac_kld_check_stat(td->td_ucred); 1389 if (error) 1390 return (error); 1391 #endif 1392 1393 sx_xlock(&kld_sx); 1394 lf = linker_find_file_by_id(uap->fileid); 1395 if (lf) { 1396 MOD_SLOCK; 1397 mp = TAILQ_FIRST(&lf->modules); 1398 if (mp != NULL) 1399 td->td_retval[0] = module_getid(mp); 1400 else 1401 td->td_retval[0] = 0; 1402 MOD_SUNLOCK; 1403 } else 1404 error = ENOENT; 1405 sx_xunlock(&kld_sx); 1406 return (error); 1407 } 1408 1409 int 1410 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1411 { 1412 char *symstr = NULL; 1413 c_linker_sym_t sym; 1414 linker_symval_t symval; 1415 linker_file_t lf; 1416 struct kld_sym_lookup lookup; 1417 int error = 0; 1418 1419 #ifdef MAC 1420 error = mac_kld_check_stat(td->td_ucred); 1421 if (error) 1422 return (error); 1423 #endif 1424 1425 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1426 return (error); 1427 if (lookup.version != sizeof(lookup) || 1428 uap->cmd != KLDSYM_LOOKUP) 1429 return (EINVAL); 1430 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1431 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1432 goto out; 1433 sx_xlock(&kld_sx); 1434 if (uap->fileid != 0) { 1435 lf = linker_find_file_by_id(uap->fileid); 1436 if (lf == NULL) 1437 error = ENOENT; 1438 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1439 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1440 lookup.symvalue = (uintptr_t) symval.value; 1441 lookup.symsize = symval.size; 1442 error = copyout(&lookup, uap->data, sizeof(lookup)); 1443 } else 1444 error = ENOENT; 1445 } else { 1446 TAILQ_FOREACH(lf, &linker_files, link) { 1447 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1448 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1449 lookup.symvalue = (uintptr_t)symval.value; 1450 lookup.symsize = symval.size; 1451 error = copyout(&lookup, uap->data, 1452 sizeof(lookup)); 1453 break; 1454 } 1455 } 1456 if (lf == NULL) 1457 error = ENOENT; 1458 } 1459 sx_xunlock(&kld_sx); 1460 out: 1461 free(symstr, M_TEMP); 1462 return (error); 1463 } 1464 1465 /* 1466 * Preloaded module support 1467 */ 1468 1469 static modlist_t 1470 modlist_lookup(const char *name, int ver) 1471 { 1472 modlist_t mod; 1473 1474 TAILQ_FOREACH(mod, &found_modules, link) { 1475 if (strcmp(mod->name, name) == 0 && 1476 (ver == 0 || mod->version == ver)) 1477 return (mod); 1478 } 1479 return (NULL); 1480 } 1481 1482 static modlist_t 1483 modlist_lookup2(const char *name, const struct mod_depend *verinfo) 1484 { 1485 modlist_t mod, bestmod; 1486 int ver; 1487 1488 if (verinfo == NULL) 1489 return (modlist_lookup(name, 0)); 1490 bestmod = NULL; 1491 TAILQ_FOREACH(mod, &found_modules, link) { 1492 if (strcmp(mod->name, name) != 0) 1493 continue; 1494 ver = mod->version; 1495 if (ver == verinfo->md_ver_preferred) 1496 return (mod); 1497 if (ver >= verinfo->md_ver_minimum && 1498 ver <= verinfo->md_ver_maximum && 1499 (bestmod == NULL || ver > bestmod->version)) 1500 bestmod = mod; 1501 } 1502 return (bestmod); 1503 } 1504 1505 static modlist_t 1506 modlist_newmodule(const char *modname, int version, linker_file_t container) 1507 { 1508 modlist_t mod; 1509 1510 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1511 if (mod == NULL) 1512 panic("no memory for module list"); 1513 mod->container = container; 1514 mod->name = modname; 1515 mod->version = version; 1516 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1517 return (mod); 1518 } 1519 1520 static void 1521 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1522 struct mod_metadata **stop, int preload) 1523 { 1524 struct mod_metadata *mp, **mdp; 1525 const char *modname; 1526 int ver; 1527 1528 for (mdp = start; mdp < stop; mdp++) { 1529 mp = *mdp; 1530 if (mp->md_type != MDT_VERSION) 1531 continue; 1532 modname = mp->md_cval; 1533 ver = ((const struct mod_version *)mp->md_data)->mv_version; 1534 if (modlist_lookup(modname, ver) != NULL) { 1535 printf("module %s already present!\n", modname); 1536 /* XXX what can we do? this is a build error. :-( */ 1537 continue; 1538 } 1539 modlist_newmodule(modname, ver, lf); 1540 } 1541 } 1542 1543 static void 1544 linker_preload(void *arg) 1545 { 1546 caddr_t modptr; 1547 const char *modname, *nmodname; 1548 char *modtype; 1549 linker_file_t lf, nlf; 1550 linker_class_t lc; 1551 int error; 1552 linker_file_list_t loaded_files; 1553 linker_file_list_t depended_files; 1554 struct mod_metadata *mp, *nmp; 1555 struct mod_metadata **start, **stop, **mdp, **nmdp; 1556 const struct mod_depend *verinfo; 1557 int nver; 1558 int resolves; 1559 modlist_t mod; 1560 struct sysinit **si_start, **si_stop; 1561 1562 TAILQ_INIT(&loaded_files); 1563 TAILQ_INIT(&depended_files); 1564 TAILQ_INIT(&found_modules); 1565 error = 0; 1566 1567 modptr = NULL; 1568 sx_xlock(&kld_sx); 1569 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1570 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1571 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1572 if (modname == NULL) { 1573 printf("Preloaded module at %p does not have a" 1574 " name!\n", modptr); 1575 continue; 1576 } 1577 if (modtype == NULL) { 1578 printf("Preloaded module at %p does not have a type!\n", 1579 modptr); 1580 continue; 1581 } 1582 if (bootverbose) 1583 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1584 modptr); 1585 lf = NULL; 1586 TAILQ_FOREACH(lc, &classes, link) { 1587 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1588 if (!error) 1589 break; 1590 lf = NULL; 1591 } 1592 if (lf) 1593 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1594 } 1595 1596 /* 1597 * First get a list of stuff in the kernel. 1598 */ 1599 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1600 &stop, NULL) == 0) 1601 linker_addmodules(linker_kernel_file, start, stop, 1); 1602 1603 /* 1604 * This is a once-off kinky bubble sort to resolve relocation 1605 * dependency requirements. 1606 */ 1607 restart: 1608 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1609 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1610 &stop, NULL); 1611 /* 1612 * First, look to see if we would successfully link with this 1613 * stuff. 1614 */ 1615 resolves = 1; /* unless we know otherwise */ 1616 if (!error) { 1617 for (mdp = start; mdp < stop; mdp++) { 1618 mp = *mdp; 1619 if (mp->md_type != MDT_DEPEND) 1620 continue; 1621 modname = mp->md_cval; 1622 verinfo = mp->md_data; 1623 for (nmdp = start; nmdp < stop; nmdp++) { 1624 nmp = *nmdp; 1625 if (nmp->md_type != MDT_VERSION) 1626 continue; 1627 nmodname = nmp->md_cval; 1628 if (strcmp(modname, nmodname) == 0) 1629 break; 1630 } 1631 if (nmdp < stop) /* it's a self reference */ 1632 continue; 1633 1634 /* 1635 * ok, the module isn't here yet, we 1636 * are not finished 1637 */ 1638 if (modlist_lookup2(modname, verinfo) == NULL) 1639 resolves = 0; 1640 } 1641 } 1642 /* 1643 * OK, if we found our modules, we can link. So, "provide" 1644 * the modules inside and add it to the end of the link order 1645 * list. 1646 */ 1647 if (resolves) { 1648 if (!error) { 1649 for (mdp = start; mdp < stop; mdp++) { 1650 mp = *mdp; 1651 if (mp->md_type != MDT_VERSION) 1652 continue; 1653 modname = mp->md_cval; 1654 nver = ((const struct mod_version *) 1655 mp->md_data)->mv_version; 1656 if (modlist_lookup(modname, 1657 nver) != NULL) { 1658 printf("module %s already" 1659 " present!\n", modname); 1660 TAILQ_REMOVE(&loaded_files, 1661 lf, loaded); 1662 linker_file_unload(lf, 1663 LINKER_UNLOAD_FORCE); 1664 /* we changed tailq next ptr */ 1665 goto restart; 1666 } 1667 modlist_newmodule(modname, nver, lf); 1668 } 1669 } 1670 TAILQ_REMOVE(&loaded_files, lf, loaded); 1671 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1672 /* 1673 * Since we provided modules, we need to restart the 1674 * sort so that the previous files that depend on us 1675 * have a chance. Also, we've busted the tailq next 1676 * pointer with the REMOVE. 1677 */ 1678 goto restart; 1679 } 1680 } 1681 1682 /* 1683 * At this point, we check to see what could not be resolved.. 1684 */ 1685 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1686 TAILQ_REMOVE(&loaded_files, lf, loaded); 1687 printf("KLD file %s is missing dependencies\n", lf->filename); 1688 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1689 } 1690 1691 /* 1692 * We made it. Finish off the linking in the order we determined. 1693 */ 1694 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1695 if (linker_kernel_file) { 1696 linker_kernel_file->refs++; 1697 error = linker_file_add_dependency(lf, 1698 linker_kernel_file); 1699 if (error) 1700 panic("cannot add dependency"); 1701 } 1702 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1703 &stop, NULL); 1704 if (!error) { 1705 for (mdp = start; mdp < stop; mdp++) { 1706 mp = *mdp; 1707 if (mp->md_type != MDT_DEPEND) 1708 continue; 1709 modname = mp->md_cval; 1710 verinfo = mp->md_data; 1711 mod = modlist_lookup2(modname, verinfo); 1712 if (mod == NULL) { 1713 printf("KLD file %s - cannot find " 1714 "dependency \"%s\"\n", 1715 lf->filename, modname); 1716 goto fail; 1717 } 1718 /* Don't count self-dependencies */ 1719 if (lf == mod->container) 1720 continue; 1721 mod->container->refs++; 1722 error = linker_file_add_dependency(lf, 1723 mod->container); 1724 if (error) 1725 panic("cannot add dependency"); 1726 } 1727 } 1728 /* 1729 * Now do relocation etc using the symbol search paths 1730 * established by the dependencies 1731 */ 1732 error = LINKER_LINK_PRELOAD_FINISH(lf); 1733 if (error) { 1734 printf("KLD file %s - could not finalize loading\n", 1735 lf->filename); 1736 goto fail; 1737 } 1738 linker_file_register_modules(lf); 1739 if (!TAILQ_EMPTY(&lf->modules)) 1740 lf->flags |= LINKER_FILE_MODULES; 1741 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1742 &si_stop, NULL) == 0) 1743 sysinit_add(si_start, si_stop); 1744 linker_file_register_sysctls(lf, true); 1745 lf->flags |= LINKER_FILE_LINKED; 1746 continue; 1747 fail: 1748 TAILQ_REMOVE(&depended_files, lf, loaded); 1749 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1750 } 1751 sx_xunlock(&kld_sx); 1752 /* woohoo! we made it! */ 1753 } 1754 1755 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL); 1756 1757 /* 1758 * Handle preload files that failed to load any modules. 1759 */ 1760 static void 1761 linker_preload_finish(void *arg) 1762 { 1763 linker_file_t lf, nlf; 1764 1765 sx_xlock(&kld_sx); 1766 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) { 1767 /* 1768 * If all of the modules in this file failed to load, unload 1769 * the file and return an error of ENOEXEC. (Parity with 1770 * linker_load_file.) 1771 */ 1772 if ((lf->flags & LINKER_FILE_MODULES) != 0 && 1773 TAILQ_EMPTY(&lf->modules)) { 1774 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1775 continue; 1776 } 1777 1778 lf->flags &= ~LINKER_FILE_MODULES; 1779 lf->userrefs++; /* so we can (try to) kldunload it */ 1780 } 1781 sx_xunlock(&kld_sx); 1782 } 1783 1784 /* 1785 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be 1786 * scheduled at any subsystem and order, so run this as late as possible. init 1787 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that. 1788 */ 1789 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE, 1790 linker_preload_finish, NULL); 1791 1792 /* 1793 * Search for a not-loaded module by name. 1794 * 1795 * Modules may be found in the following locations: 1796 * 1797 * - preloaded (result is just the module name) - on disk (result is full path 1798 * to module) 1799 * 1800 * If the module name is qualified in any way (contains path, etc.) the we 1801 * simply return a copy of it. 1802 * 1803 * The search path can be manipulated via sysctl. Note that we use the ';' 1804 * character as a separator to be consistent with the bootloader. 1805 */ 1806 1807 static char linker_hintfile[] = "linker.hints"; 1808 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1809 1810 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path, 1811 sizeof(linker_path), "module load search path"); 1812 1813 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1814 1815 static const char * const linker_ext_list[] = { 1816 "", 1817 ".ko", 1818 NULL 1819 }; 1820 1821 /* 1822 * Check if file actually exists either with or without extension listed in 1823 * the linker_ext_list. (probably should be generic for the rest of the 1824 * kernel) 1825 */ 1826 static char * 1827 linker_lookup_file(const char *path, int pathlen, const char *name, 1828 int namelen, struct vattr *vap) 1829 { 1830 struct nameidata nd; 1831 struct thread *td = curthread; /* XXX */ 1832 const char * const *cpp, *sep; 1833 char *result; 1834 int error, len, extlen, reclen, flags; 1835 enum vtype type; 1836 1837 extlen = 0; 1838 for (cpp = linker_ext_list; *cpp; cpp++) { 1839 len = strlen(*cpp); 1840 if (len > extlen) 1841 extlen = len; 1842 } 1843 extlen++; /* trailing '\0' */ 1844 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1845 1846 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1847 result = malloc(reclen, M_LINKER, M_WAITOK); 1848 for (cpp = linker_ext_list; *cpp; cpp++) { 1849 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1850 namelen, name, *cpp); 1851 /* 1852 * Attempt to open the file, and return the path if 1853 * we succeed and it's a regular file. 1854 */ 1855 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1856 flags = FREAD; 1857 error = vn_open(&nd, &flags, 0, NULL); 1858 if (error == 0) { 1859 NDFREE(&nd, NDF_ONLY_PNBUF); 1860 type = nd.ni_vp->v_type; 1861 if (vap) 1862 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1863 VOP_UNLOCK(nd.ni_vp); 1864 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1865 if (type == VREG) 1866 return (result); 1867 } 1868 } 1869 free(result, M_LINKER); 1870 return (NULL); 1871 } 1872 1873 #define INT_ALIGN(base, ptr) ptr = \ 1874 (base) + roundup2((ptr) - (base), sizeof(int)) 1875 1876 /* 1877 * Lookup KLD which contains requested module in the "linker.hints" file. If 1878 * version specification is available, then try to find the best KLD. 1879 * Otherwise just find the latest one. 1880 */ 1881 static char * 1882 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1883 int modnamelen, const struct mod_depend *verinfo) 1884 { 1885 struct thread *td = curthread; /* XXX */ 1886 struct ucred *cred = td ? td->td_ucred : NULL; 1887 struct nameidata nd; 1888 struct vattr vattr, mattr; 1889 const char *best, *sep; 1890 u_char *hints = NULL; 1891 u_char *cp, *recptr, *bufend, *result, *pathbuf; 1892 int error, ival, bestver, *intp, found, flags, clen, blen; 1893 ssize_t reclen; 1894 1895 result = NULL; 1896 bestver = found = 0; 1897 1898 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1899 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1900 strlen(sep) + 1; 1901 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1902 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1903 linker_hintfile); 1904 1905 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1906 flags = FREAD; 1907 error = vn_open(&nd, &flags, 0, NULL); 1908 if (error) 1909 goto bad; 1910 NDFREE(&nd, NDF_ONLY_PNBUF); 1911 if (nd.ni_vp->v_type != VREG) 1912 goto bad; 1913 best = cp = NULL; 1914 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1915 if (error) 1916 goto bad; 1917 /* 1918 * XXX: we need to limit this number to some reasonable value 1919 */ 1920 if (vattr.va_size > LINKER_HINTS_MAX) { 1921 printf("linker.hints file too large %ld\n", (long)vattr.va_size); 1922 goto bad; 1923 } 1924 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1925 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1926 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1927 if (error) 1928 goto bad; 1929 VOP_UNLOCK(nd.ni_vp); 1930 vn_close(nd.ni_vp, FREAD, cred, td); 1931 nd.ni_vp = NULL; 1932 if (reclen != 0) { 1933 printf("can't read %zd\n", reclen); 1934 goto bad; 1935 } 1936 intp = (int *)hints; 1937 ival = *intp++; 1938 if (ival != LINKER_HINTS_VERSION) { 1939 printf("linker.hints file version mismatch %d\n", ival); 1940 goto bad; 1941 } 1942 bufend = hints + vattr.va_size; 1943 recptr = (u_char *)intp; 1944 clen = blen = 0; 1945 while (recptr < bufend && !found) { 1946 intp = (int *)recptr; 1947 reclen = *intp++; 1948 ival = *intp++; 1949 cp = (char *)intp; 1950 switch (ival) { 1951 case MDT_VERSION: 1952 clen = *cp++; 1953 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1954 break; 1955 cp += clen; 1956 INT_ALIGN(hints, cp); 1957 ival = *(int *)cp; 1958 cp += sizeof(int); 1959 clen = *cp++; 1960 if (verinfo == NULL || 1961 ival == verinfo->md_ver_preferred) { 1962 found = 1; 1963 break; 1964 } 1965 if (ival >= verinfo->md_ver_minimum && 1966 ival <= verinfo->md_ver_maximum && 1967 ival > bestver) { 1968 bestver = ival; 1969 best = cp; 1970 blen = clen; 1971 } 1972 break; 1973 default: 1974 break; 1975 } 1976 recptr += reclen + sizeof(int); 1977 } 1978 /* 1979 * Finally check if KLD is in the place 1980 */ 1981 if (found) 1982 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1983 else if (best) 1984 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1985 1986 /* 1987 * KLD is newer than hints file. What we should do now? 1988 */ 1989 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1990 printf("warning: KLD '%s' is newer than the linker.hints" 1991 " file\n", result); 1992 bad: 1993 free(pathbuf, M_LINKER); 1994 if (hints) 1995 free(hints, M_TEMP); 1996 if (nd.ni_vp != NULL) { 1997 VOP_UNLOCK(nd.ni_vp); 1998 vn_close(nd.ni_vp, FREAD, cred, td); 1999 } 2000 /* 2001 * If nothing found or hints is absent - fallback to the old 2002 * way by using "kldname[.ko]" as module name. 2003 */ 2004 if (!found && !bestver && result == NULL) 2005 result = linker_lookup_file(path, pathlen, modname, 2006 modnamelen, NULL); 2007 return (result); 2008 } 2009 2010 /* 2011 * Lookup KLD which contains requested module in the all directories. 2012 */ 2013 static char * 2014 linker_search_module(const char *modname, int modnamelen, 2015 const struct mod_depend *verinfo) 2016 { 2017 char *cp, *ep, *result; 2018 2019 /* 2020 * traverse the linker path 2021 */ 2022 for (cp = linker_path; *cp; cp = ep + 1) { 2023 /* find the end of this component */ 2024 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 2025 result = linker_hints_lookup(cp, ep - cp, modname, 2026 modnamelen, verinfo); 2027 if (result != NULL) 2028 return (result); 2029 if (*ep == 0) 2030 break; 2031 } 2032 return (NULL); 2033 } 2034 2035 /* 2036 * Search for module in all directories listed in the linker_path. 2037 */ 2038 static char * 2039 linker_search_kld(const char *name) 2040 { 2041 char *cp, *ep, *result; 2042 int len; 2043 2044 /* qualified at all? */ 2045 if (strchr(name, '/')) 2046 return (strdup(name, M_LINKER)); 2047 2048 /* traverse the linker path */ 2049 len = strlen(name); 2050 for (ep = linker_path; *ep; ep++) { 2051 cp = ep; 2052 /* find the end of this component */ 2053 for (; *ep != 0 && *ep != ';'; ep++); 2054 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 2055 if (result != NULL) 2056 return (result); 2057 } 2058 return (NULL); 2059 } 2060 2061 static const char * 2062 linker_basename(const char *path) 2063 { 2064 const char *filename; 2065 2066 filename = strrchr(path, '/'); 2067 if (filename == NULL) 2068 return path; 2069 if (filename[1]) 2070 filename++; 2071 return (filename); 2072 } 2073 2074 #ifdef HWPMC_HOOKS 2075 /* 2076 * Inform hwpmc about the set of kernel modules currently loaded. 2077 */ 2078 void * 2079 linker_hwpmc_list_objects(void) 2080 { 2081 linker_file_t lf; 2082 struct pmckern_map_in *kobase; 2083 int i, nmappings; 2084 2085 nmappings = 0; 2086 sx_slock(&kld_sx); 2087 TAILQ_FOREACH(lf, &linker_files, link) 2088 nmappings++; 2089 2090 /* Allocate nmappings + 1 entries. */ 2091 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 2092 M_LINKER, M_WAITOK | M_ZERO); 2093 i = 0; 2094 TAILQ_FOREACH(lf, &linker_files, link) { 2095 /* Save the info for this linker file. */ 2096 kobase[i].pm_file = lf->filename; 2097 kobase[i].pm_address = (uintptr_t)lf->address; 2098 i++; 2099 } 2100 sx_sunlock(&kld_sx); 2101 2102 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 2103 2104 /* The last entry of the malloced area comprises of all zeros. */ 2105 KASSERT(kobase[i].pm_file == NULL, 2106 ("linker_hwpmc_list_objects: last object not NULL")); 2107 2108 return ((void *)kobase); 2109 } 2110 #endif 2111 2112 /* check if root file system is not mounted */ 2113 static bool 2114 linker_root_mounted(void) 2115 { 2116 struct pwd *pwd; 2117 bool ret; 2118 2119 if (rootvnode == NULL) 2120 return (false); 2121 2122 pwd = pwd_hold(curthread); 2123 ret = pwd->pwd_rdir != NULL; 2124 pwd_drop(pwd); 2125 return (ret); 2126 } 2127 2128 /* 2129 * Find a file which contains given module and load it, if "parent" is not 2130 * NULL, register a reference to it. 2131 */ 2132 static int 2133 linker_load_module(const char *kldname, const char *modname, 2134 struct linker_file *parent, const struct mod_depend *verinfo, 2135 struct linker_file **lfpp) 2136 { 2137 linker_file_t lfdep; 2138 const char *filename; 2139 char *pathname; 2140 int error; 2141 2142 sx_assert(&kld_sx, SA_XLOCKED); 2143 if (modname == NULL) { 2144 /* 2145 * We have to load KLD 2146 */ 2147 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 2148 " is not NULL")); 2149 if (!linker_root_mounted()) 2150 return (ENXIO); 2151 pathname = linker_search_kld(kldname); 2152 } else { 2153 if (modlist_lookup2(modname, verinfo) != NULL) 2154 return (EEXIST); 2155 if (!linker_root_mounted()) 2156 return (ENXIO); 2157 if (kldname != NULL) 2158 pathname = strdup(kldname, M_LINKER); 2159 else 2160 /* 2161 * Need to find a KLD with required module 2162 */ 2163 pathname = linker_search_module(modname, 2164 strlen(modname), verinfo); 2165 } 2166 if (pathname == NULL) 2167 return (ENOENT); 2168 2169 /* 2170 * Can't load more than one file with the same basename XXX: 2171 * Actually it should be possible to have multiple KLDs with 2172 * the same basename but different path because they can 2173 * provide different versions of the same modules. 2174 */ 2175 filename = linker_basename(pathname); 2176 if (linker_find_file_by_name(filename)) 2177 error = EEXIST; 2178 else do { 2179 error = linker_load_file(pathname, &lfdep); 2180 if (error) 2181 break; 2182 if (modname && verinfo && 2183 modlist_lookup2(modname, verinfo) == NULL) { 2184 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2185 error = ENOENT; 2186 break; 2187 } 2188 if (parent) { 2189 error = linker_file_add_dependency(parent, lfdep); 2190 if (error) 2191 break; 2192 } 2193 if (lfpp) 2194 *lfpp = lfdep; 2195 } while (0); 2196 free(pathname, M_LINKER); 2197 return (error); 2198 } 2199 2200 /* 2201 * This routine is responsible for finding dependencies of userland initiated 2202 * kldload(2)'s of files. 2203 */ 2204 int 2205 linker_load_dependencies(linker_file_t lf) 2206 { 2207 linker_file_t lfdep; 2208 struct mod_metadata **start, **stop, **mdp, **nmdp; 2209 struct mod_metadata *mp, *nmp; 2210 const struct mod_depend *verinfo; 2211 modlist_t mod; 2212 const char *modname, *nmodname; 2213 int ver, error = 0; 2214 2215 /* 2216 * All files are dependent on /kernel. 2217 */ 2218 sx_assert(&kld_sx, SA_XLOCKED); 2219 if (linker_kernel_file) { 2220 linker_kernel_file->refs++; 2221 error = linker_file_add_dependency(lf, linker_kernel_file); 2222 if (error) 2223 return (error); 2224 } 2225 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2226 NULL) != 0) 2227 return (0); 2228 for (mdp = start; mdp < stop; mdp++) { 2229 mp = *mdp; 2230 if (mp->md_type != MDT_VERSION) 2231 continue; 2232 modname = mp->md_cval; 2233 ver = ((const struct mod_version *)mp->md_data)->mv_version; 2234 mod = modlist_lookup(modname, ver); 2235 if (mod != NULL) { 2236 printf("interface %s.%d already present in the KLD" 2237 " '%s'!\n", modname, ver, 2238 mod->container->filename); 2239 return (EEXIST); 2240 } 2241 } 2242 2243 for (mdp = start; mdp < stop; mdp++) { 2244 mp = *mdp; 2245 if (mp->md_type != MDT_DEPEND) 2246 continue; 2247 modname = mp->md_cval; 2248 verinfo = mp->md_data; 2249 nmodname = NULL; 2250 for (nmdp = start; nmdp < stop; nmdp++) { 2251 nmp = *nmdp; 2252 if (nmp->md_type != MDT_VERSION) 2253 continue; 2254 nmodname = nmp->md_cval; 2255 if (strcmp(modname, nmodname) == 0) 2256 break; 2257 } 2258 if (nmdp < stop)/* early exit, it's a self reference */ 2259 continue; 2260 mod = modlist_lookup2(modname, verinfo); 2261 if (mod) { /* woohoo, it's loaded already */ 2262 lfdep = mod->container; 2263 lfdep->refs++; 2264 error = linker_file_add_dependency(lf, lfdep); 2265 if (error) 2266 break; 2267 continue; 2268 } 2269 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2270 if (error) { 2271 printf("KLD %s: depends on %s - not available or" 2272 " version mismatch\n", lf->filename, modname); 2273 break; 2274 } 2275 } 2276 2277 if (error) 2278 return (error); 2279 linker_addmodules(lf, start, stop, 0); 2280 return (error); 2281 } 2282 2283 static int 2284 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2285 { 2286 struct sysctl_req *req; 2287 2288 req = opaque; 2289 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2290 } 2291 2292 /* 2293 * Export a nul-separated, double-nul-terminated list of all function names 2294 * in the kernel. 2295 */ 2296 static int 2297 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2298 { 2299 linker_file_t lf; 2300 int error; 2301 2302 #ifdef MAC 2303 error = mac_kld_check_stat(req->td->td_ucred); 2304 if (error) 2305 return (error); 2306 #endif 2307 error = sysctl_wire_old_buffer(req, 0); 2308 if (error != 0) 2309 return (error); 2310 sx_xlock(&kld_sx); 2311 TAILQ_FOREACH(lf, &linker_files, link) { 2312 error = LINKER_EACH_FUNCTION_NAME(lf, 2313 sysctl_kern_function_list_iterate, req); 2314 if (error) { 2315 sx_xunlock(&kld_sx); 2316 return (error); 2317 } 2318 } 2319 sx_xunlock(&kld_sx); 2320 return (SYSCTL_OUT(req, "", 1)); 2321 } 2322 2323 SYSCTL_PROC(_kern, OID_AUTO, function_list, 2324 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 2325 sysctl_kern_function_list, "", 2326 "kernel function list"); 2327