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 */ 109 110 /* 111 * Load counter used by clients to determine if a linker file has been 112 * re-loaded. This counter is incremented for each file load. 113 */ 114 static int loadcnt; 115 116 static linker_class_list_t classes; 117 static linker_file_list_t linker_files; 118 static int next_file_id = 1; 119 static int linker_no_more_classes = 0; 120 121 #define LINKER_GET_NEXT_FILE_ID(a) do { \ 122 linker_file_t lftmp; \ 123 \ 124 if (!cold) \ 125 sx_assert(&kld_sx, SA_XLOCKED); \ 126 retry: \ 127 TAILQ_FOREACH(lftmp, &linker_files, link) { \ 128 if (next_file_id == lftmp->id) { \ 129 next_file_id++; \ 130 goto retry; \ 131 } \ 132 } \ 133 (a) = next_file_id; \ 134 } while(0) 135 136 /* XXX wrong name; we're looking at version provision tags here, not modules */ 137 typedef TAILQ_HEAD(, modlist) modlisthead_t; 138 struct modlist { 139 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 140 linker_file_t container; 141 const char *name; 142 int version; 143 }; 144 typedef struct modlist *modlist_t; 145 static modlisthead_t found_modules; 146 147 static int linker_file_add_dependency(linker_file_t file, 148 linker_file_t dep); 149 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file, 150 const char* name, int deps); 151 static int linker_load_module(const char *kldname, 152 const char *modname, struct linker_file *parent, 153 const struct mod_depend *verinfo, struct linker_file **lfpp); 154 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo); 155 156 static void 157 linker_init(void *arg) 158 { 159 160 sx_init(&kld_sx, "kernel linker"); 161 TAILQ_INIT(&classes); 162 TAILQ_INIT(&linker_files); 163 } 164 165 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, NULL); 166 167 static void 168 linker_stop_class_add(void *arg) 169 { 170 171 linker_no_more_classes = 1; 172 } 173 174 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL); 175 176 int 177 linker_add_class(linker_class_t lc) 178 { 179 180 /* 181 * We disallow any class registration past SI_ORDER_ANY 182 * of SI_SUB_KLD. We bump the reference count to keep the 183 * ops from being freed. 184 */ 185 if (linker_no_more_classes == 1) 186 return (EPERM); 187 kobj_class_compile((kobj_class_t) lc); 188 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */ 189 TAILQ_INSERT_TAIL(&classes, lc, link); 190 return (0); 191 } 192 193 static void 194 linker_file_sysinit(linker_file_t lf) 195 { 196 struct sysinit **start, **stop, **sipp, **xipp, *save; 197 198 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 199 lf->filename)); 200 201 sx_assert(&kld_sx, SA_XLOCKED); 202 203 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 204 return; 205 /* 206 * Perform a bubble sort of the system initialization objects by 207 * their subsystem (primary key) and order (secondary key). 208 * 209 * Since some things care about execution order, this is the operation 210 * which ensures continued function. 211 */ 212 for (sipp = start; sipp < stop; sipp++) { 213 for (xipp = sipp + 1; xipp < stop; xipp++) { 214 if ((*sipp)->subsystem < (*xipp)->subsystem || 215 ((*sipp)->subsystem == (*xipp)->subsystem && 216 (*sipp)->order <= (*xipp)->order)) 217 continue; /* skip */ 218 save = *sipp; 219 *sipp = *xipp; 220 *xipp = save; 221 } 222 } 223 224 /* 225 * Traverse the (now) ordered list of system initialization tasks. 226 * Perform each task, and continue on to the next task. 227 */ 228 sx_xunlock(&kld_sx); 229 mtx_lock(&Giant); 230 for (sipp = start; sipp < stop; sipp++) { 231 if ((*sipp)->subsystem == SI_SUB_DUMMY) 232 continue; /* skip dummy task(s) */ 233 234 /* Call function */ 235 (*((*sipp)->func)) ((*sipp)->udata); 236 } 237 mtx_unlock(&Giant); 238 sx_xlock(&kld_sx); 239 } 240 241 static void 242 linker_file_sysuninit(linker_file_t lf) 243 { 244 struct sysinit **start, **stop, **sipp, **xipp, *save; 245 246 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 247 lf->filename)); 248 249 sx_assert(&kld_sx, SA_XLOCKED); 250 251 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 252 NULL) != 0) 253 return; 254 255 /* 256 * Perform a reverse bubble sort of the system initialization objects 257 * by their subsystem (primary key) and order (secondary key). 258 * 259 * Since some things care about execution order, this is the operation 260 * which ensures continued function. 261 */ 262 for (sipp = start; sipp < stop; sipp++) { 263 for (xipp = sipp + 1; xipp < stop; xipp++) { 264 if ((*sipp)->subsystem > (*xipp)->subsystem || 265 ((*sipp)->subsystem == (*xipp)->subsystem && 266 (*sipp)->order >= (*xipp)->order)) 267 continue; /* skip */ 268 save = *sipp; 269 *sipp = *xipp; 270 *xipp = save; 271 } 272 } 273 274 /* 275 * Traverse the (now) ordered list of system initialization tasks. 276 * Perform each task, and continue on to the next task. 277 */ 278 sx_xunlock(&kld_sx); 279 mtx_lock(&Giant); 280 for (sipp = start; sipp < stop; sipp++) { 281 if ((*sipp)->subsystem == SI_SUB_DUMMY) 282 continue; /* skip dummy task(s) */ 283 284 /* Call function */ 285 (*((*sipp)->func)) ((*sipp)->udata); 286 } 287 mtx_unlock(&Giant); 288 sx_xlock(&kld_sx); 289 } 290 291 static void 292 linker_file_register_sysctls(linker_file_t lf, bool enable) 293 { 294 struct sysctl_oid **start, **stop, **oidp; 295 296 KLD_DPF(FILE, 297 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 298 lf->filename)); 299 300 sx_assert(&kld_sx, SA_XLOCKED); 301 302 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 303 return; 304 305 sx_xunlock(&kld_sx); 306 sysctl_wlock(); 307 for (oidp = start; oidp < stop; oidp++) { 308 if (enable) 309 sysctl_register_oid(*oidp); 310 else 311 sysctl_register_disabled_oid(*oidp); 312 } 313 sysctl_wunlock(); 314 sx_xlock(&kld_sx); 315 } 316 317 static void 318 linker_file_enable_sysctls(linker_file_t lf) 319 { 320 struct sysctl_oid **start, **stop, **oidp; 321 322 KLD_DPF(FILE, 323 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n", 324 lf->filename)); 325 326 sx_assert(&kld_sx, SA_XLOCKED); 327 328 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 329 return; 330 331 sx_xunlock(&kld_sx); 332 sysctl_wlock(); 333 for (oidp = start; oidp < stop; oidp++) 334 sysctl_enable_oid(*oidp); 335 sysctl_wunlock(); 336 sx_xlock(&kld_sx); 337 } 338 339 static void 340 linker_file_unregister_sysctls(linker_file_t lf) 341 { 342 struct sysctl_oid **start, **stop, **oidp; 343 344 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs" 345 " for %s\n", lf->filename)); 346 347 sx_assert(&kld_sx, SA_XLOCKED); 348 349 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 350 return; 351 352 sx_xunlock(&kld_sx); 353 sysctl_wlock(); 354 for (oidp = start; oidp < stop; oidp++) 355 sysctl_unregister_oid(*oidp); 356 sysctl_wunlock(); 357 sx_xlock(&kld_sx); 358 } 359 360 static int 361 linker_file_register_modules(linker_file_t lf) 362 { 363 struct mod_metadata **start, **stop, **mdp; 364 const moduledata_t *moddata; 365 int first_error, error; 366 367 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 368 " in %s\n", lf->filename)); 369 370 sx_assert(&kld_sx, SA_XLOCKED); 371 372 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &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 NULL); 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 * If the file type has not been recognized by the last try 485 * printout a message before to fail. 486 */ 487 if (error == ENOSYS) 488 printf("%s: %s - unsupported file type\n", 489 __func__, filename); 490 491 /* 492 * Format not recognized or otherwise unloadable. 493 * When loading a module that is statically built into 494 * the kernel EEXIST percolates back up as the return 495 * value. Preserve this so that apps like sysinstall 496 * can recognize this special case and not post bogus 497 * dialog boxes. 498 */ 499 if (error != EEXIST) 500 error = ENOEXEC; 501 } else 502 error = ENOENT; /* Nothing found */ 503 return (error); 504 } 505 506 int 507 linker_reference_module(const char *modname, struct mod_depend *verinfo, 508 linker_file_t *result) 509 { 510 modlist_t mod; 511 int error; 512 513 sx_xlock(&kld_sx); 514 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 515 *result = mod->container; 516 (*result)->refs++; 517 sx_xunlock(&kld_sx); 518 return (0); 519 } 520 521 error = linker_load_module(NULL, modname, NULL, verinfo, result); 522 sx_xunlock(&kld_sx); 523 return (error); 524 } 525 526 int 527 linker_release_module(const char *modname, struct mod_depend *verinfo, 528 linker_file_t lf) 529 { 530 modlist_t mod; 531 int error; 532 533 sx_xlock(&kld_sx); 534 if (lf == NULL) { 535 KASSERT(modname != NULL, 536 ("linker_release_module: no file or name")); 537 mod = modlist_lookup2(modname, verinfo); 538 if (mod == NULL) { 539 sx_xunlock(&kld_sx); 540 return (ESRCH); 541 } 542 lf = mod->container; 543 } else 544 KASSERT(modname == NULL && verinfo == NULL, 545 ("linker_release_module: both file and name")); 546 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL); 547 sx_xunlock(&kld_sx); 548 return (error); 549 } 550 551 static linker_file_t 552 linker_find_file_by_name(const char *filename) 553 { 554 linker_file_t lf; 555 char *koname; 556 557 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 558 sprintf(koname, "%s.ko", filename); 559 560 sx_assert(&kld_sx, SA_XLOCKED); 561 TAILQ_FOREACH(lf, &linker_files, link) { 562 if (strcmp(lf->filename, koname) == 0) 563 break; 564 if (strcmp(lf->filename, filename) == 0) 565 break; 566 } 567 free(koname, M_LINKER); 568 return (lf); 569 } 570 571 static linker_file_t 572 linker_find_file_by_id(int fileid) 573 { 574 linker_file_t lf; 575 576 sx_assert(&kld_sx, SA_XLOCKED); 577 TAILQ_FOREACH(lf, &linker_files, link) 578 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED) 579 break; 580 return (lf); 581 } 582 583 int 584 linker_file_foreach(linker_predicate_t *predicate, void *context) 585 { 586 linker_file_t lf; 587 int retval = 0; 588 589 sx_xlock(&kld_sx); 590 TAILQ_FOREACH(lf, &linker_files, link) { 591 retval = predicate(lf, context); 592 if (retval != 0) 593 break; 594 } 595 sx_xunlock(&kld_sx); 596 return (retval); 597 } 598 599 linker_file_t 600 linker_make_file(const char *pathname, linker_class_t lc) 601 { 602 linker_file_t lf; 603 const char *filename; 604 605 if (!cold) 606 sx_assert(&kld_sx, SA_XLOCKED); 607 filename = linker_basename(pathname); 608 609 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname)); 610 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 611 if (lf == NULL) 612 return (NULL); 613 lf->ctors_addr = 0; 614 lf->ctors_size = 0; 615 lf->refs = 1; 616 lf->userrefs = 0; 617 lf->flags = 0; 618 lf->filename = strdup(filename, M_LINKER); 619 lf->pathname = strdup(pathname, M_LINKER); 620 LINKER_GET_NEXT_FILE_ID(lf->id); 621 lf->ndeps = 0; 622 lf->deps = NULL; 623 lf->loadcnt = ++loadcnt; 624 #ifdef __arm__ 625 lf->exidx_addr = 0; 626 lf->exidx_size = 0; 627 #endif 628 STAILQ_INIT(&lf->common); 629 TAILQ_INIT(&lf->modules); 630 TAILQ_INSERT_TAIL(&linker_files, lf, link); 631 return (lf); 632 } 633 634 int 635 linker_file_unload(linker_file_t file, int flags) 636 { 637 module_t mod, next; 638 modlist_t ml, nextml; 639 struct common_symbol *cp; 640 int error, i; 641 642 /* Refuse to unload modules if securelevel raised. */ 643 if (prison0.pr_securelevel > 0) 644 return (EPERM); 645 646 sx_assert(&kld_sx, SA_XLOCKED); 647 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 648 649 /* Easy case of just dropping a reference. */ 650 if (file->refs > 1) { 651 file->refs--; 652 return (0); 653 } 654 655 /* Give eventhandlers a chance to prevent the unload. */ 656 error = 0; 657 EVENTHANDLER_INVOKE(kld_unload_try, file, &error); 658 if (error != 0) 659 return (EBUSY); 660 661 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 662 " informing modules\n")); 663 664 /* 665 * Quiesce all the modules to give them a chance to veto the unload. 666 */ 667 MOD_SLOCK; 668 for (mod = TAILQ_FIRST(&file->modules); mod; 669 mod = module_getfnext(mod)) { 670 error = module_quiesce(mod); 671 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 672 KLD_DPF(FILE, ("linker_file_unload: module %s" 673 " vetoed unload\n", module_getname(mod))); 674 /* 675 * XXX: Do we need to tell all the quiesced modules 676 * that they can resume work now via a new module 677 * event? 678 */ 679 MOD_SUNLOCK; 680 return (error); 681 } 682 } 683 MOD_SUNLOCK; 684 685 /* 686 * Inform any modules associated with this file that they are 687 * being unloaded. 688 */ 689 MOD_XLOCK; 690 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 691 next = module_getfnext(mod); 692 MOD_XUNLOCK; 693 694 /* 695 * Give the module a chance to veto the unload. 696 */ 697 if ((error = module_unload(mod)) != 0) { 698 #ifdef KLD_DEBUG 699 MOD_SLOCK; 700 KLD_DPF(FILE, ("linker_file_unload: module %s" 701 " failed unload\n", module_getname(mod))); 702 MOD_SUNLOCK; 703 #endif 704 return (error); 705 } 706 MOD_XLOCK; 707 module_release(mod); 708 } 709 MOD_XUNLOCK; 710 711 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 712 if (ml->container == file) { 713 TAILQ_REMOVE(&found_modules, ml, link); 714 free(ml, M_LINKER); 715 } 716 } 717 718 /* 719 * Don't try to run SYSUNINITs if we are unloaded due to a 720 * link error. 721 */ 722 if (file->flags & LINKER_FILE_LINKED) { 723 file->flags &= ~LINKER_FILE_LINKED; 724 linker_file_unregister_sysctls(file); 725 linker_file_sysuninit(file); 726 } 727 TAILQ_REMOVE(&linker_files, file, link); 728 729 if (file->deps) { 730 for (i = 0; i < file->ndeps; i++) 731 linker_file_unload(file->deps[i], flags); 732 free(file->deps, M_LINKER); 733 file->deps = NULL; 734 } 735 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 736 STAILQ_REMOVE_HEAD(&file->common, link); 737 free(cp, M_LINKER); 738 } 739 740 LINKER_UNLOAD(file); 741 742 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address, 743 file->size); 744 745 if (file->filename) { 746 free(file->filename, M_LINKER); 747 file->filename = NULL; 748 } 749 if (file->pathname) { 750 free(file->pathname, M_LINKER); 751 file->pathname = NULL; 752 } 753 kobj_delete((kobj_t) file, M_LINKER); 754 return (0); 755 } 756 757 int 758 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 759 { 760 return (LINKER_CTF_GET(file, lc)); 761 } 762 763 static int 764 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 765 { 766 linker_file_t *newdeps; 767 768 sx_assert(&kld_sx, SA_XLOCKED); 769 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps), 770 M_LINKER, M_WAITOK | M_ZERO); 771 file->deps[file->ndeps] = dep; 772 file->ndeps++; 773 KLD_DPF(FILE, ("linker_file_add_dependency:" 774 " adding %s as dependency for %s\n", 775 dep->filename, file->filename)); 776 return (0); 777 } 778 779 /* 780 * Locate a linker set and its contents. This is a helper function to avoid 781 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 782 * This function is used in this file so we can avoid having lots of (void **) 783 * casts. 784 */ 785 int 786 linker_file_lookup_set(linker_file_t file, const char *name, 787 void *firstp, void *lastp, int *countp) 788 { 789 790 sx_assert(&kld_sx, SA_LOCKED); 791 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 792 } 793 794 /* 795 * List all functions in a file. 796 */ 797 int 798 linker_file_function_listall(linker_file_t lf, 799 linker_function_nameval_callback_t callback_func, void *arg) 800 { 801 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 802 } 803 804 caddr_t 805 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 806 { 807 caddr_t sym; 808 int locked; 809 810 locked = sx_xlocked(&kld_sx); 811 if (!locked) 812 sx_xlock(&kld_sx); 813 sym = linker_file_lookup_symbol_internal(file, name, deps); 814 if (!locked) 815 sx_xunlock(&kld_sx); 816 return (sym); 817 } 818 819 static caddr_t 820 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 821 int deps) 822 { 823 c_linker_sym_t sym; 824 linker_symval_t symval; 825 caddr_t address; 826 size_t common_size = 0; 827 int i; 828 829 sx_assert(&kld_sx, SA_XLOCKED); 830 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 831 file, name, deps)); 832 833 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 834 LINKER_SYMBOL_VALUES(file, sym, &symval); 835 if (symval.value == 0) 836 /* 837 * For commons, first look them up in the 838 * dependencies and only allocate space if not found 839 * there. 840 */ 841 common_size = symval.size; 842 else { 843 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 844 ".value=%p\n", symval.value)); 845 return (symval.value); 846 } 847 } 848 if (deps) { 849 for (i = 0; i < file->ndeps; i++) { 850 address = linker_file_lookup_symbol_internal( 851 file->deps[i], name, 0); 852 if (address) { 853 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 854 " deps value=%p\n", address)); 855 return (address); 856 } 857 } 858 } 859 if (common_size > 0) { 860 /* 861 * This is a common symbol which was not found in the 862 * dependencies. We maintain a simple common symbol table in 863 * the file object. 864 */ 865 struct common_symbol *cp; 866 867 STAILQ_FOREACH(cp, &file->common, link) { 868 if (strcmp(cp->name, name) == 0) { 869 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 870 " old common value=%p\n", cp->address)); 871 return (cp->address); 872 } 873 } 874 /* 875 * Round the symbol size up to align. 876 */ 877 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 878 cp = malloc(sizeof(struct common_symbol) 879 + common_size + strlen(name) + 1, M_LINKER, 880 M_WAITOK | M_ZERO); 881 cp->address = (caddr_t)(cp + 1); 882 cp->name = cp->address + common_size; 883 strcpy(cp->name, name); 884 bzero(cp->address, common_size); 885 STAILQ_INSERT_TAIL(&file->common, cp, link); 886 887 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 888 " value=%p\n", cp->address)); 889 return (cp->address); 890 } 891 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 892 return (0); 893 } 894 895 /* 896 * Both DDB and stack(9) rely on the kernel linker to provide forward and 897 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 898 * do this in a lockfree manner. We provide a set of internal helper 899 * routines to perform these operations without locks, and then wrappers that 900 * optionally lock. 901 * 902 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 903 */ 904 #ifdef DDB 905 static int 906 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 907 { 908 linker_file_t lf; 909 910 TAILQ_FOREACH(lf, &linker_files, link) { 911 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 912 return (0); 913 } 914 return (ENOENT); 915 } 916 #endif 917 918 static int 919 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 920 { 921 linker_file_t lf; 922 c_linker_sym_t best, es; 923 u_long diff, bestdiff, off; 924 925 best = 0; 926 off = (uintptr_t)value; 927 bestdiff = off; 928 TAILQ_FOREACH(lf, &linker_files, link) { 929 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 930 continue; 931 if (es != 0 && diff < bestdiff) { 932 best = es; 933 bestdiff = diff; 934 } 935 if (bestdiff == 0) 936 break; 937 } 938 if (best) { 939 *sym = best; 940 *diffp = bestdiff; 941 return (0); 942 } else { 943 *sym = 0; 944 *diffp = off; 945 return (ENOENT); 946 } 947 } 948 949 static int 950 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 951 { 952 linker_file_t lf; 953 954 TAILQ_FOREACH(lf, &linker_files, link) { 955 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 956 return (0); 957 } 958 return (ENOENT); 959 } 960 961 static int 962 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 963 long *offset) 964 { 965 linker_symval_t symval; 966 c_linker_sym_t sym; 967 int error; 968 969 *offset = 0; 970 error = linker_debug_search_symbol(value, &sym, offset); 971 if (error) 972 return (error); 973 error = linker_debug_symbol_values(sym, &symval); 974 if (error) 975 return (error); 976 strlcpy(buf, symval.name, buflen); 977 return (0); 978 } 979 980 /* 981 * DDB Helpers. DDB has to look across multiple files with their own symbol 982 * tables and string tables. 983 * 984 * Note that we do not obey list locking protocols here. We really don't need 985 * DDB to hang because somebody's got the lock held. We'll take the chance 986 * that the files list is inconsistent instead. 987 */ 988 #ifdef DDB 989 int 990 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 991 { 992 993 return (linker_debug_lookup(symstr, sym)); 994 } 995 #endif 996 997 int 998 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 999 { 1000 1001 return (linker_debug_search_symbol(value, sym, diffp)); 1002 } 1003 1004 int 1005 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 1006 { 1007 1008 return (linker_debug_symbol_values(sym, symval)); 1009 } 1010 1011 int 1012 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1013 long *offset) 1014 { 1015 1016 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 1017 } 1018 1019 /* 1020 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 1021 * obey locking protocols, and offer a significantly less complex interface. 1022 */ 1023 int 1024 linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen, 1025 long *offset, int flags) 1026 { 1027 int error; 1028 1029 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 && 1030 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK), 1031 ("%s: bad flags: 0x%x", __func__, flags)); 1032 1033 if (flags & M_NOWAIT) { 1034 if (!sx_try_slock(&kld_sx)) 1035 return (EWOULDBLOCK); 1036 } else 1037 sx_slock(&kld_sx); 1038 1039 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 1040 sx_sunlock(&kld_sx); 1041 return (error); 1042 } 1043 1044 int 1045 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1046 long *offset) 1047 { 1048 1049 return (linker_search_symbol_name_flags(value, buf, buflen, offset, 1050 M_WAITOK)); 1051 } 1052 1053 /* 1054 * Syscalls. 1055 */ 1056 int 1057 kern_kldload(struct thread *td, const char *file, int *fileid) 1058 { 1059 const char *kldname, *modname; 1060 linker_file_t lf; 1061 int error; 1062 1063 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1064 return (error); 1065 1066 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1067 return (error); 1068 1069 /* 1070 * It is possible that kldloaded module will attach a new ifnet, 1071 * so vnet context must be set when this ocurs. 1072 */ 1073 CURVNET_SET(TD_TO_VNET(td)); 1074 1075 /* 1076 * If file does not contain a qualified name or any dot in it 1077 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1078 * name. 1079 */ 1080 if (strchr(file, '/') || strchr(file, '.')) { 1081 kldname = file; 1082 modname = NULL; 1083 } else { 1084 kldname = NULL; 1085 modname = file; 1086 } 1087 1088 sx_xlock(&kld_sx); 1089 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1090 if (error) { 1091 sx_xunlock(&kld_sx); 1092 goto done; 1093 } 1094 lf->userrefs++; 1095 if (fileid != NULL) 1096 *fileid = lf->id; 1097 sx_xunlock(&kld_sx); 1098 1099 done: 1100 CURVNET_RESTORE(); 1101 return (error); 1102 } 1103 1104 int 1105 sys_kldload(struct thread *td, struct kldload_args *uap) 1106 { 1107 char *pathname = NULL; 1108 int error, fileid; 1109 1110 td->td_retval[0] = -1; 1111 1112 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1113 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1114 if (error == 0) { 1115 error = kern_kldload(td, pathname, &fileid); 1116 if (error == 0) 1117 td->td_retval[0] = fileid; 1118 } 1119 free(pathname, M_TEMP); 1120 return (error); 1121 } 1122 1123 int 1124 kern_kldunload(struct thread *td, int fileid, int flags) 1125 { 1126 linker_file_t lf; 1127 int error = 0; 1128 1129 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1130 return (error); 1131 1132 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1133 return (error); 1134 1135 CURVNET_SET(TD_TO_VNET(td)); 1136 sx_xlock(&kld_sx); 1137 lf = linker_find_file_by_id(fileid); 1138 if (lf) { 1139 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1140 1141 if (lf->userrefs == 0) { 1142 /* 1143 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1144 */ 1145 printf("kldunload: attempt to unload file that was" 1146 " loaded by the kernel\n"); 1147 error = EBUSY; 1148 } else { 1149 lf->userrefs--; 1150 error = linker_file_unload(lf, flags); 1151 if (error) 1152 lf->userrefs++; 1153 } 1154 } else 1155 error = ENOENT; 1156 sx_xunlock(&kld_sx); 1157 1158 CURVNET_RESTORE(); 1159 return (error); 1160 } 1161 1162 int 1163 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1164 { 1165 1166 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1167 } 1168 1169 int 1170 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1171 { 1172 1173 if (uap->flags != LINKER_UNLOAD_NORMAL && 1174 uap->flags != LINKER_UNLOAD_FORCE) 1175 return (EINVAL); 1176 return (kern_kldunload(td, uap->fileid, uap->flags)); 1177 } 1178 1179 int 1180 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1181 { 1182 char *pathname; 1183 const char *filename; 1184 linker_file_t lf; 1185 int error; 1186 1187 #ifdef MAC 1188 error = mac_kld_check_stat(td->td_ucred); 1189 if (error) 1190 return (error); 1191 #endif 1192 1193 td->td_retval[0] = -1; 1194 1195 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1196 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1197 goto out; 1198 1199 filename = linker_basename(pathname); 1200 sx_xlock(&kld_sx); 1201 lf = linker_find_file_by_name(filename); 1202 if (lf) 1203 td->td_retval[0] = lf->id; 1204 else 1205 error = ENOENT; 1206 sx_xunlock(&kld_sx); 1207 out: 1208 free(pathname, M_TEMP); 1209 return (error); 1210 } 1211 1212 int 1213 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1214 { 1215 linker_file_t lf; 1216 int error = 0; 1217 1218 #ifdef MAC 1219 error = mac_kld_check_stat(td->td_ucred); 1220 if (error) 1221 return (error); 1222 #endif 1223 1224 sx_xlock(&kld_sx); 1225 if (uap->fileid == 0) 1226 lf = TAILQ_FIRST(&linker_files); 1227 else { 1228 lf = linker_find_file_by_id(uap->fileid); 1229 if (lf == NULL) { 1230 error = ENOENT; 1231 goto out; 1232 } 1233 lf = TAILQ_NEXT(lf, link); 1234 } 1235 1236 /* Skip partially loaded files. */ 1237 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1238 lf = TAILQ_NEXT(lf, link); 1239 1240 if (lf) 1241 td->td_retval[0] = lf->id; 1242 else 1243 td->td_retval[0] = 0; 1244 out: 1245 sx_xunlock(&kld_sx); 1246 return (error); 1247 } 1248 1249 int 1250 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1251 { 1252 struct kld_file_stat *stat; 1253 int error, version; 1254 1255 /* 1256 * Check the version of the user's structure. 1257 */ 1258 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1259 != 0) 1260 return (error); 1261 if (version != sizeof(struct kld_file_stat_1) && 1262 version != sizeof(struct kld_file_stat)) 1263 return (EINVAL); 1264 1265 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO); 1266 error = kern_kldstat(td, uap->fileid, stat); 1267 if (error == 0) 1268 error = copyout(stat, uap->stat, version); 1269 free(stat, M_TEMP); 1270 return (error); 1271 } 1272 1273 int 1274 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat) 1275 { 1276 linker_file_t lf; 1277 int namelen; 1278 #ifdef MAC 1279 int error; 1280 1281 error = mac_kld_check_stat(td->td_ucred); 1282 if (error) 1283 return (error); 1284 #endif 1285 1286 sx_xlock(&kld_sx); 1287 lf = linker_find_file_by_id(fileid); 1288 if (lf == NULL) { 1289 sx_xunlock(&kld_sx); 1290 return (ENOENT); 1291 } 1292 1293 /* Version 1 fields: */ 1294 namelen = strlen(lf->filename) + 1; 1295 if (namelen > sizeof(stat->name)) 1296 namelen = sizeof(stat->name); 1297 bcopy(lf->filename, &stat->name[0], namelen); 1298 stat->refs = lf->refs; 1299 stat->id = lf->id; 1300 stat->address = lf->address; 1301 stat->size = lf->size; 1302 /* Version 2 fields: */ 1303 namelen = strlen(lf->pathname) + 1; 1304 if (namelen > sizeof(stat->pathname)) 1305 namelen = sizeof(stat->pathname); 1306 bcopy(lf->pathname, &stat->pathname[0], namelen); 1307 sx_xunlock(&kld_sx); 1308 1309 td->td_retval[0] = 0; 1310 return (0); 1311 } 1312 1313 #ifdef DDB 1314 DB_COMMAND(kldstat, db_kldstat) 1315 { 1316 linker_file_t lf; 1317 1318 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2)) 1319 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' '); 1320 #undef POINTER_WIDTH 1321 TAILQ_FOREACH(lf, &linker_files, link) { 1322 if (db_pager_quit) 1323 return; 1324 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs, 1325 lf->address, lf->size, lf->filename); 1326 } 1327 } 1328 #endif /* DDB */ 1329 1330 int 1331 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1332 { 1333 linker_file_t lf; 1334 module_t mp; 1335 int error = 0; 1336 1337 #ifdef MAC 1338 error = mac_kld_check_stat(td->td_ucred); 1339 if (error) 1340 return (error); 1341 #endif 1342 1343 sx_xlock(&kld_sx); 1344 lf = linker_find_file_by_id(uap->fileid); 1345 if (lf) { 1346 MOD_SLOCK; 1347 mp = TAILQ_FIRST(&lf->modules); 1348 if (mp != NULL) 1349 td->td_retval[0] = module_getid(mp); 1350 else 1351 td->td_retval[0] = 0; 1352 MOD_SUNLOCK; 1353 } else 1354 error = ENOENT; 1355 sx_xunlock(&kld_sx); 1356 return (error); 1357 } 1358 1359 int 1360 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1361 { 1362 char *symstr = NULL; 1363 c_linker_sym_t sym; 1364 linker_symval_t symval; 1365 linker_file_t lf; 1366 struct kld_sym_lookup lookup; 1367 int error = 0; 1368 1369 #ifdef MAC 1370 error = mac_kld_check_stat(td->td_ucred); 1371 if (error) 1372 return (error); 1373 #endif 1374 1375 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1376 return (error); 1377 if (lookup.version != sizeof(lookup) || 1378 uap->cmd != KLDSYM_LOOKUP) 1379 return (EINVAL); 1380 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1381 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1382 goto out; 1383 sx_xlock(&kld_sx); 1384 if (uap->fileid != 0) { 1385 lf = linker_find_file_by_id(uap->fileid); 1386 if (lf == NULL) 1387 error = ENOENT; 1388 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1389 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1390 lookup.symvalue = (uintptr_t) symval.value; 1391 lookup.symsize = symval.size; 1392 error = copyout(&lookup, uap->data, sizeof(lookup)); 1393 } else 1394 error = ENOENT; 1395 } else { 1396 TAILQ_FOREACH(lf, &linker_files, link) { 1397 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1398 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1399 lookup.symvalue = (uintptr_t)symval.value; 1400 lookup.symsize = symval.size; 1401 error = copyout(&lookup, uap->data, 1402 sizeof(lookup)); 1403 break; 1404 } 1405 } 1406 if (lf == NULL) 1407 error = ENOENT; 1408 } 1409 sx_xunlock(&kld_sx); 1410 out: 1411 free(symstr, M_TEMP); 1412 return (error); 1413 } 1414 1415 /* 1416 * Preloaded module support 1417 */ 1418 1419 static modlist_t 1420 modlist_lookup(const char *name, int ver) 1421 { 1422 modlist_t mod; 1423 1424 TAILQ_FOREACH(mod, &found_modules, link) { 1425 if (strcmp(mod->name, name) == 0 && 1426 (ver == 0 || mod->version == ver)) 1427 return (mod); 1428 } 1429 return (NULL); 1430 } 1431 1432 static modlist_t 1433 modlist_lookup2(const char *name, const struct mod_depend *verinfo) 1434 { 1435 modlist_t mod, bestmod; 1436 int ver; 1437 1438 if (verinfo == NULL) 1439 return (modlist_lookup(name, 0)); 1440 bestmod = NULL; 1441 TAILQ_FOREACH(mod, &found_modules, link) { 1442 if (strcmp(mod->name, name) != 0) 1443 continue; 1444 ver = mod->version; 1445 if (ver == verinfo->md_ver_preferred) 1446 return (mod); 1447 if (ver >= verinfo->md_ver_minimum && 1448 ver <= verinfo->md_ver_maximum && 1449 (bestmod == NULL || ver > bestmod->version)) 1450 bestmod = mod; 1451 } 1452 return (bestmod); 1453 } 1454 1455 static modlist_t 1456 modlist_newmodule(const char *modname, int version, linker_file_t container) 1457 { 1458 modlist_t mod; 1459 1460 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1461 if (mod == NULL) 1462 panic("no memory for module list"); 1463 mod->container = container; 1464 mod->name = modname; 1465 mod->version = version; 1466 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1467 return (mod); 1468 } 1469 1470 static void 1471 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1472 struct mod_metadata **stop, int preload) 1473 { 1474 struct mod_metadata *mp, **mdp; 1475 const char *modname; 1476 int ver; 1477 1478 for (mdp = start; mdp < stop; mdp++) { 1479 mp = *mdp; 1480 if (mp->md_type != MDT_VERSION) 1481 continue; 1482 modname = mp->md_cval; 1483 ver = ((const struct mod_version *)mp->md_data)->mv_version; 1484 if (modlist_lookup(modname, ver) != NULL) { 1485 printf("module %s already present!\n", modname); 1486 /* XXX what can we do? this is a build error. :-( */ 1487 continue; 1488 } 1489 modlist_newmodule(modname, ver, lf); 1490 } 1491 } 1492 1493 static void 1494 linker_preload(void *arg) 1495 { 1496 caddr_t modptr; 1497 const char *modname, *nmodname; 1498 char *modtype; 1499 linker_file_t lf, nlf; 1500 linker_class_t lc; 1501 int error; 1502 linker_file_list_t loaded_files; 1503 linker_file_list_t depended_files; 1504 struct mod_metadata *mp, *nmp; 1505 struct mod_metadata **start, **stop, **mdp, **nmdp; 1506 const struct mod_depend *verinfo; 1507 int nver; 1508 int resolves; 1509 modlist_t mod; 1510 struct sysinit **si_start, **si_stop; 1511 1512 TAILQ_INIT(&loaded_files); 1513 TAILQ_INIT(&depended_files); 1514 TAILQ_INIT(&found_modules); 1515 error = 0; 1516 1517 modptr = NULL; 1518 sx_xlock(&kld_sx); 1519 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1520 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1521 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1522 if (modname == NULL) { 1523 printf("Preloaded module at %p does not have a" 1524 " name!\n", modptr); 1525 continue; 1526 } 1527 if (modtype == NULL) { 1528 printf("Preloaded module at %p does not have a type!\n", 1529 modptr); 1530 continue; 1531 } 1532 if (bootverbose) 1533 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1534 modptr); 1535 lf = NULL; 1536 TAILQ_FOREACH(lc, &classes, link) { 1537 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1538 if (!error) 1539 break; 1540 lf = NULL; 1541 } 1542 if (lf) 1543 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1544 } 1545 1546 /* 1547 * First get a list of stuff in the kernel. 1548 */ 1549 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1550 &stop, NULL) == 0) 1551 linker_addmodules(linker_kernel_file, start, stop, 1); 1552 1553 /* 1554 * This is a once-off kinky bubble sort to resolve relocation 1555 * dependency requirements. 1556 */ 1557 restart: 1558 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1559 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1560 &stop, NULL); 1561 /* 1562 * First, look to see if we would successfully link with this 1563 * stuff. 1564 */ 1565 resolves = 1; /* unless we know otherwise */ 1566 if (!error) { 1567 for (mdp = start; mdp < stop; mdp++) { 1568 mp = *mdp; 1569 if (mp->md_type != MDT_DEPEND) 1570 continue; 1571 modname = mp->md_cval; 1572 verinfo = mp->md_data; 1573 for (nmdp = start; nmdp < stop; nmdp++) { 1574 nmp = *nmdp; 1575 if (nmp->md_type != MDT_VERSION) 1576 continue; 1577 nmodname = nmp->md_cval; 1578 if (strcmp(modname, nmodname) == 0) 1579 break; 1580 } 1581 if (nmdp < stop) /* it's a self reference */ 1582 continue; 1583 1584 /* 1585 * ok, the module isn't here yet, we 1586 * are not finished 1587 */ 1588 if (modlist_lookup2(modname, verinfo) == NULL) 1589 resolves = 0; 1590 } 1591 } 1592 /* 1593 * OK, if we found our modules, we can link. So, "provide" 1594 * the modules inside and add it to the end of the link order 1595 * list. 1596 */ 1597 if (resolves) { 1598 if (!error) { 1599 for (mdp = start; mdp < stop; mdp++) { 1600 mp = *mdp; 1601 if (mp->md_type != MDT_VERSION) 1602 continue; 1603 modname = mp->md_cval; 1604 nver = ((const struct mod_version *) 1605 mp->md_data)->mv_version; 1606 if (modlist_lookup(modname, 1607 nver) != NULL) { 1608 printf("module %s already" 1609 " present!\n", modname); 1610 TAILQ_REMOVE(&loaded_files, 1611 lf, loaded); 1612 linker_file_unload(lf, 1613 LINKER_UNLOAD_FORCE); 1614 /* we changed tailq next ptr */ 1615 goto restart; 1616 } 1617 modlist_newmodule(modname, nver, lf); 1618 } 1619 } 1620 TAILQ_REMOVE(&loaded_files, lf, loaded); 1621 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1622 /* 1623 * Since we provided modules, we need to restart the 1624 * sort so that the previous files that depend on us 1625 * have a chance. Also, we've busted the tailq next 1626 * pointer with the REMOVE. 1627 */ 1628 goto restart; 1629 } 1630 } 1631 1632 /* 1633 * At this point, we check to see what could not be resolved.. 1634 */ 1635 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1636 TAILQ_REMOVE(&loaded_files, lf, loaded); 1637 printf("KLD file %s is missing dependencies\n", lf->filename); 1638 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1639 } 1640 1641 /* 1642 * We made it. Finish off the linking in the order we determined. 1643 */ 1644 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1645 if (linker_kernel_file) { 1646 linker_kernel_file->refs++; 1647 error = linker_file_add_dependency(lf, 1648 linker_kernel_file); 1649 if (error) 1650 panic("cannot add dependency"); 1651 } 1652 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1653 &stop, NULL); 1654 if (!error) { 1655 for (mdp = start; mdp < stop; mdp++) { 1656 mp = *mdp; 1657 if (mp->md_type != MDT_DEPEND) 1658 continue; 1659 modname = mp->md_cval; 1660 verinfo = mp->md_data; 1661 mod = modlist_lookup2(modname, verinfo); 1662 if (mod == NULL) { 1663 printf("KLD file %s - cannot find " 1664 "dependency \"%s\"\n", 1665 lf->filename, modname); 1666 goto fail; 1667 } 1668 /* Don't count self-dependencies */ 1669 if (lf == mod->container) 1670 continue; 1671 mod->container->refs++; 1672 error = linker_file_add_dependency(lf, 1673 mod->container); 1674 if (error) 1675 panic("cannot add dependency"); 1676 } 1677 } 1678 /* 1679 * Now do relocation etc using the symbol search paths 1680 * established by the dependencies 1681 */ 1682 error = LINKER_LINK_PRELOAD_FINISH(lf); 1683 if (error) { 1684 printf("KLD file %s - could not finalize loading\n", 1685 lf->filename); 1686 goto fail; 1687 } 1688 linker_file_register_modules(lf); 1689 if (!TAILQ_EMPTY(&lf->modules)) 1690 lf->flags |= LINKER_FILE_MODULES; 1691 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1692 &si_stop, NULL) == 0) 1693 sysinit_add(si_start, si_stop); 1694 linker_file_register_sysctls(lf, true); 1695 lf->flags |= LINKER_FILE_LINKED; 1696 continue; 1697 fail: 1698 TAILQ_REMOVE(&depended_files, lf, loaded); 1699 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1700 } 1701 sx_xunlock(&kld_sx); 1702 /* woohoo! we made it! */ 1703 } 1704 1705 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL); 1706 1707 /* 1708 * Handle preload files that failed to load any modules. 1709 */ 1710 static void 1711 linker_preload_finish(void *arg) 1712 { 1713 linker_file_t lf, nlf; 1714 1715 sx_xlock(&kld_sx); 1716 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) { 1717 /* 1718 * If all of the modules in this file failed to load, unload 1719 * the file and return an error of ENOEXEC. (Parity with 1720 * linker_load_file.) 1721 */ 1722 if ((lf->flags & LINKER_FILE_MODULES) != 0 && 1723 TAILQ_EMPTY(&lf->modules)) { 1724 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1725 continue; 1726 } 1727 1728 lf->flags &= ~LINKER_FILE_MODULES; 1729 lf->userrefs++; /* so we can (try to) kldunload it */ 1730 } 1731 sx_xunlock(&kld_sx); 1732 } 1733 1734 /* 1735 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be 1736 * scheduled at any subsystem and order, so run this as late as possible. init 1737 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that. 1738 */ 1739 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE, 1740 linker_preload_finish, NULL); 1741 1742 /* 1743 * Search for a not-loaded module by name. 1744 * 1745 * Modules may be found in the following locations: 1746 * 1747 * - preloaded (result is just the module name) - on disk (result is full path 1748 * to module) 1749 * 1750 * If the module name is qualified in any way (contains path, etc.) the we 1751 * simply return a copy of it. 1752 * 1753 * The search path can be manipulated via sysctl. Note that we use the ';' 1754 * character as a separator to be consistent with the bootloader. 1755 */ 1756 1757 static char linker_hintfile[] = "linker.hints"; 1758 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1759 1760 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path, 1761 sizeof(linker_path), "module load search path"); 1762 1763 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1764 1765 static const char * const linker_ext_list[] = { 1766 "", 1767 ".ko", 1768 NULL 1769 }; 1770 1771 /* 1772 * Check if file actually exists either with or without extension listed in 1773 * the linker_ext_list. (probably should be generic for the rest of the 1774 * kernel) 1775 */ 1776 static char * 1777 linker_lookup_file(const char *path, int pathlen, const char *name, 1778 int namelen, struct vattr *vap) 1779 { 1780 struct nameidata nd; 1781 struct thread *td = curthread; /* XXX */ 1782 const char * const *cpp, *sep; 1783 char *result; 1784 int error, len, extlen, reclen, flags; 1785 enum vtype type; 1786 1787 extlen = 0; 1788 for (cpp = linker_ext_list; *cpp; cpp++) { 1789 len = strlen(*cpp); 1790 if (len > extlen) 1791 extlen = len; 1792 } 1793 extlen++; /* trailing '\0' */ 1794 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1795 1796 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1797 result = malloc(reclen, M_LINKER, M_WAITOK); 1798 for (cpp = linker_ext_list; *cpp; cpp++) { 1799 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1800 namelen, name, *cpp); 1801 /* 1802 * Attempt to open the file, and return the path if 1803 * we succeed and it's a regular file. 1804 */ 1805 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1806 flags = FREAD; 1807 error = vn_open(&nd, &flags, 0, NULL); 1808 if (error == 0) { 1809 NDFREE(&nd, NDF_ONLY_PNBUF); 1810 type = nd.ni_vp->v_type; 1811 if (vap) 1812 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1813 VOP_UNLOCK(nd.ni_vp); 1814 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1815 if (type == VREG) 1816 return (result); 1817 } 1818 } 1819 free(result, M_LINKER); 1820 return (NULL); 1821 } 1822 1823 #define INT_ALIGN(base, ptr) ptr = \ 1824 (base) + roundup2((ptr) - (base), sizeof(int)) 1825 1826 /* 1827 * Lookup KLD which contains requested module in the "linker.hints" file. If 1828 * version specification is available, then try to find the best KLD. 1829 * Otherwise just find the latest one. 1830 */ 1831 static char * 1832 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1833 int modnamelen, const struct mod_depend *verinfo) 1834 { 1835 struct thread *td = curthread; /* XXX */ 1836 struct ucred *cred = td ? td->td_ucred : NULL; 1837 struct nameidata nd; 1838 struct vattr vattr, mattr; 1839 const char *best, *sep; 1840 u_char *hints = NULL; 1841 u_char *cp, *recptr, *bufend, *result, *pathbuf; 1842 int error, ival, bestver, *intp, found, flags, clen, blen; 1843 ssize_t reclen; 1844 1845 result = NULL; 1846 bestver = found = 0; 1847 1848 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1849 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1850 strlen(sep) + 1; 1851 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1852 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1853 linker_hintfile); 1854 1855 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1856 flags = FREAD; 1857 error = vn_open(&nd, &flags, 0, NULL); 1858 if (error) 1859 goto bad; 1860 NDFREE(&nd, NDF_ONLY_PNBUF); 1861 if (nd.ni_vp->v_type != VREG) 1862 goto bad; 1863 best = cp = NULL; 1864 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1865 if (error) 1866 goto bad; 1867 /* 1868 * XXX: we need to limit this number to some reasonable value 1869 */ 1870 if (vattr.va_size > LINKER_HINTS_MAX) { 1871 printf("linker.hints file too large %ld\n", (long)vattr.va_size); 1872 goto bad; 1873 } 1874 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1875 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1876 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1877 if (error) 1878 goto bad; 1879 VOP_UNLOCK(nd.ni_vp); 1880 vn_close(nd.ni_vp, FREAD, cred, td); 1881 nd.ni_vp = NULL; 1882 if (reclen != 0) { 1883 printf("can't read %zd\n", reclen); 1884 goto bad; 1885 } 1886 intp = (int *)hints; 1887 ival = *intp++; 1888 if (ival != LINKER_HINTS_VERSION) { 1889 printf("linker.hints file version mismatch %d\n", ival); 1890 goto bad; 1891 } 1892 bufend = hints + vattr.va_size; 1893 recptr = (u_char *)intp; 1894 clen = blen = 0; 1895 while (recptr < bufend && !found) { 1896 intp = (int *)recptr; 1897 reclen = *intp++; 1898 ival = *intp++; 1899 cp = (char *)intp; 1900 switch (ival) { 1901 case MDT_VERSION: 1902 clen = *cp++; 1903 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1904 break; 1905 cp += clen; 1906 INT_ALIGN(hints, cp); 1907 ival = *(int *)cp; 1908 cp += sizeof(int); 1909 clen = *cp++; 1910 if (verinfo == NULL || 1911 ival == verinfo->md_ver_preferred) { 1912 found = 1; 1913 break; 1914 } 1915 if (ival >= verinfo->md_ver_minimum && 1916 ival <= verinfo->md_ver_maximum && 1917 ival > bestver) { 1918 bestver = ival; 1919 best = cp; 1920 blen = clen; 1921 } 1922 break; 1923 default: 1924 break; 1925 } 1926 recptr += reclen + sizeof(int); 1927 } 1928 /* 1929 * Finally check if KLD is in the place 1930 */ 1931 if (found) 1932 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1933 else if (best) 1934 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1935 1936 /* 1937 * KLD is newer than hints file. What we should do now? 1938 */ 1939 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1940 printf("warning: KLD '%s' is newer than the linker.hints" 1941 " file\n", result); 1942 bad: 1943 free(pathbuf, M_LINKER); 1944 if (hints) 1945 free(hints, M_TEMP); 1946 if (nd.ni_vp != NULL) { 1947 VOP_UNLOCK(nd.ni_vp); 1948 vn_close(nd.ni_vp, FREAD, cred, td); 1949 } 1950 /* 1951 * If nothing found or hints is absent - fallback to the old 1952 * way by using "kldname[.ko]" as module name. 1953 */ 1954 if (!found && !bestver && result == NULL) 1955 result = linker_lookup_file(path, pathlen, modname, 1956 modnamelen, NULL); 1957 return (result); 1958 } 1959 1960 /* 1961 * Lookup KLD which contains requested module in the all directories. 1962 */ 1963 static char * 1964 linker_search_module(const char *modname, int modnamelen, 1965 const struct mod_depend *verinfo) 1966 { 1967 char *cp, *ep, *result; 1968 1969 /* 1970 * traverse the linker path 1971 */ 1972 for (cp = linker_path; *cp; cp = ep + 1) { 1973 /* find the end of this component */ 1974 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1975 result = linker_hints_lookup(cp, ep - cp, modname, 1976 modnamelen, verinfo); 1977 if (result != NULL) 1978 return (result); 1979 if (*ep == 0) 1980 break; 1981 } 1982 return (NULL); 1983 } 1984 1985 /* 1986 * Search for module in all directories listed in the linker_path. 1987 */ 1988 static char * 1989 linker_search_kld(const char *name) 1990 { 1991 char *cp, *ep, *result; 1992 int len; 1993 1994 /* qualified at all? */ 1995 if (strchr(name, '/')) 1996 return (strdup(name, M_LINKER)); 1997 1998 /* traverse the linker path */ 1999 len = strlen(name); 2000 for (ep = linker_path; *ep; ep++) { 2001 cp = ep; 2002 /* find the end of this component */ 2003 for (; *ep != 0 && *ep != ';'; ep++); 2004 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 2005 if (result != NULL) 2006 return (result); 2007 } 2008 return (NULL); 2009 } 2010 2011 static const char * 2012 linker_basename(const char *path) 2013 { 2014 const char *filename; 2015 2016 filename = strrchr(path, '/'); 2017 if (filename == NULL) 2018 return path; 2019 if (filename[1]) 2020 filename++; 2021 return (filename); 2022 } 2023 2024 #ifdef HWPMC_HOOKS 2025 /* 2026 * Inform hwpmc about the set of kernel modules currently loaded. 2027 */ 2028 void * 2029 linker_hwpmc_list_objects(void) 2030 { 2031 linker_file_t lf; 2032 struct pmckern_map_in *kobase; 2033 int i, nmappings; 2034 2035 nmappings = 0; 2036 sx_slock(&kld_sx); 2037 TAILQ_FOREACH(lf, &linker_files, link) 2038 nmappings++; 2039 2040 /* Allocate nmappings + 1 entries. */ 2041 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 2042 M_LINKER, M_WAITOK | M_ZERO); 2043 i = 0; 2044 TAILQ_FOREACH(lf, &linker_files, link) { 2045 /* Save the info for this linker file. */ 2046 kobase[i].pm_file = lf->filename; 2047 kobase[i].pm_address = (uintptr_t)lf->address; 2048 i++; 2049 } 2050 sx_sunlock(&kld_sx); 2051 2052 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 2053 2054 /* The last entry of the malloced area comprises of all zeros. */ 2055 KASSERT(kobase[i].pm_file == NULL, 2056 ("linker_hwpmc_list_objects: last object not NULL")); 2057 2058 return ((void *)kobase); 2059 } 2060 #endif 2061 2062 /* check if root file system is not mounted */ 2063 static bool 2064 linker_root_mounted(void) 2065 { 2066 struct pwd *pwd; 2067 bool ret; 2068 2069 if (rootvnode == NULL) 2070 return (false); 2071 2072 pwd = pwd_hold(curthread); 2073 ret = pwd->pwd_rdir != NULL; 2074 pwd_drop(pwd); 2075 return (ret); 2076 } 2077 2078 /* 2079 * Find a file which contains given module and load it, if "parent" is not 2080 * NULL, register a reference to it. 2081 */ 2082 static int 2083 linker_load_module(const char *kldname, const char *modname, 2084 struct linker_file *parent, const struct mod_depend *verinfo, 2085 struct linker_file **lfpp) 2086 { 2087 linker_file_t lfdep; 2088 const char *filename; 2089 char *pathname; 2090 int error; 2091 2092 sx_assert(&kld_sx, SA_XLOCKED); 2093 if (modname == NULL) { 2094 /* 2095 * We have to load KLD 2096 */ 2097 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 2098 " is not NULL")); 2099 if (!linker_root_mounted()) 2100 return (ENXIO); 2101 pathname = linker_search_kld(kldname); 2102 } else { 2103 if (modlist_lookup2(modname, verinfo) != NULL) 2104 return (EEXIST); 2105 if (!linker_root_mounted()) 2106 return (ENXIO); 2107 if (kldname != NULL) 2108 pathname = strdup(kldname, M_LINKER); 2109 else 2110 /* 2111 * Need to find a KLD with required module 2112 */ 2113 pathname = linker_search_module(modname, 2114 strlen(modname), verinfo); 2115 } 2116 if (pathname == NULL) 2117 return (ENOENT); 2118 2119 /* 2120 * Can't load more than one file with the same basename XXX: 2121 * Actually it should be possible to have multiple KLDs with 2122 * the same basename but different path because they can 2123 * provide different versions of the same modules. 2124 */ 2125 filename = linker_basename(pathname); 2126 if (linker_find_file_by_name(filename)) 2127 error = EEXIST; 2128 else do { 2129 error = linker_load_file(pathname, &lfdep); 2130 if (error) 2131 break; 2132 if (modname && verinfo && 2133 modlist_lookup2(modname, verinfo) == NULL) { 2134 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2135 error = ENOENT; 2136 break; 2137 } 2138 if (parent) { 2139 error = linker_file_add_dependency(parent, lfdep); 2140 if (error) 2141 break; 2142 } 2143 if (lfpp) 2144 *lfpp = lfdep; 2145 } while (0); 2146 free(pathname, M_LINKER); 2147 return (error); 2148 } 2149 2150 /* 2151 * This routine is responsible for finding dependencies of userland initiated 2152 * kldload(2)'s of files. 2153 */ 2154 int 2155 linker_load_dependencies(linker_file_t lf) 2156 { 2157 linker_file_t lfdep; 2158 struct mod_metadata **start, **stop, **mdp, **nmdp; 2159 struct mod_metadata *mp, *nmp; 2160 const struct mod_depend *verinfo; 2161 modlist_t mod; 2162 const char *modname, *nmodname; 2163 int ver, error = 0; 2164 2165 /* 2166 * All files are dependent on /kernel. 2167 */ 2168 sx_assert(&kld_sx, SA_XLOCKED); 2169 if (linker_kernel_file) { 2170 linker_kernel_file->refs++; 2171 error = linker_file_add_dependency(lf, linker_kernel_file); 2172 if (error) 2173 return (error); 2174 } 2175 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2176 NULL) != 0) 2177 return (0); 2178 for (mdp = start; mdp < stop; mdp++) { 2179 mp = *mdp; 2180 if (mp->md_type != MDT_VERSION) 2181 continue; 2182 modname = mp->md_cval; 2183 ver = ((const struct mod_version *)mp->md_data)->mv_version; 2184 mod = modlist_lookup(modname, ver); 2185 if (mod != NULL) { 2186 printf("interface %s.%d already present in the KLD" 2187 " '%s'!\n", modname, ver, 2188 mod->container->filename); 2189 return (EEXIST); 2190 } 2191 } 2192 2193 for (mdp = start; mdp < stop; mdp++) { 2194 mp = *mdp; 2195 if (mp->md_type != MDT_DEPEND) 2196 continue; 2197 modname = mp->md_cval; 2198 verinfo = mp->md_data; 2199 nmodname = NULL; 2200 for (nmdp = start; nmdp < stop; nmdp++) { 2201 nmp = *nmdp; 2202 if (nmp->md_type != MDT_VERSION) 2203 continue; 2204 nmodname = nmp->md_cval; 2205 if (strcmp(modname, nmodname) == 0) 2206 break; 2207 } 2208 if (nmdp < stop)/* early exit, it's a self reference */ 2209 continue; 2210 mod = modlist_lookup2(modname, verinfo); 2211 if (mod) { /* woohoo, it's loaded already */ 2212 lfdep = mod->container; 2213 lfdep->refs++; 2214 error = linker_file_add_dependency(lf, lfdep); 2215 if (error) 2216 break; 2217 continue; 2218 } 2219 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2220 if (error) { 2221 printf("KLD %s: depends on %s - not available or" 2222 " version mismatch\n", lf->filename, modname); 2223 break; 2224 } 2225 } 2226 2227 if (error) 2228 return (error); 2229 linker_addmodules(lf, start, stop, 0); 2230 return (error); 2231 } 2232 2233 static int 2234 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2235 { 2236 struct sysctl_req *req; 2237 2238 req = opaque; 2239 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2240 } 2241 2242 /* 2243 * Export a nul-separated, double-nul-terminated list of all function names 2244 * in the kernel. 2245 */ 2246 static int 2247 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2248 { 2249 linker_file_t lf; 2250 int error; 2251 2252 #ifdef MAC 2253 error = mac_kld_check_stat(req->td->td_ucred); 2254 if (error) 2255 return (error); 2256 #endif 2257 error = sysctl_wire_old_buffer(req, 0); 2258 if (error != 0) 2259 return (error); 2260 sx_xlock(&kld_sx); 2261 TAILQ_FOREACH(lf, &linker_files, link) { 2262 error = LINKER_EACH_FUNCTION_NAME(lf, 2263 sysctl_kern_function_list_iterate, req); 2264 if (error) { 2265 sx_xunlock(&kld_sx); 2266 return (error); 2267 } 2268 } 2269 sx_xunlock(&kld_sx); 2270 return (SYSCTL_OUT(req, "", 1)); 2271 } 2272 2273 SYSCTL_PROC(_kern, OID_AUTO, function_list, 2274 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 2275 sysctl_kern_function_list, "", 2276 "kernel function list"); 2277