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) 135 136 137 /* 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, "modmetadata_set", &start, 374 &stop, NULL) != 0) { 375 /* 376 * This fallback should be unnecessary, but if we get booted 377 * from boot2 instead of loader and we are missing our 378 * metadata then we have to try the best we can. 379 */ 380 if (lf == linker_kernel_file) { 381 start = SET_BEGIN(modmetadata_set); 382 stop = SET_LIMIT(modmetadata_set); 383 } else 384 return (0); 385 } 386 first_error = 0; 387 for (mdp = start; mdp < stop; mdp++) { 388 if ((*mdp)->md_type != MDT_MODULE) 389 continue; 390 moddata = (*mdp)->md_data; 391 KLD_DPF(FILE, ("Registering module %s in %s\n", 392 moddata->name, lf->filename)); 393 error = module_register(moddata, lf); 394 if (error) { 395 printf("Module %s failed to register: %d\n", 396 moddata->name, error); 397 if (first_error == 0) 398 first_error = error; 399 } 400 } 401 return (first_error); 402 } 403 404 static void 405 linker_init_kernel_modules(void) 406 { 407 408 sx_xlock(&kld_sx); 409 linker_file_register_modules(linker_kernel_file); 410 sx_xunlock(&kld_sx); 411 } 412 413 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 414 NULL); 415 416 static int 417 linker_load_file(const char *filename, linker_file_t *result) 418 { 419 linker_class_t lc; 420 linker_file_t lf; 421 int foundfile, error, modules; 422 423 /* Refuse to load modules if securelevel raised */ 424 if (prison0.pr_securelevel > 0) 425 return (EPERM); 426 427 sx_assert(&kld_sx, SA_XLOCKED); 428 lf = linker_find_file_by_name(filename); 429 if (lf) { 430 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 431 " incrementing refs\n", filename)); 432 *result = lf; 433 lf->refs++; 434 return (0); 435 } 436 foundfile = 0; 437 error = 0; 438 439 /* 440 * We do not need to protect (lock) classes here because there is 441 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 442 * and there is no class deregistration mechanism at this time. 443 */ 444 TAILQ_FOREACH(lc, &classes, link) { 445 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 446 filename)); 447 error = LINKER_LOAD_FILE(lc, filename, &lf); 448 /* 449 * If we got something other than ENOENT, then it exists but 450 * we cannot load it for some other reason. 451 */ 452 if (error != ENOENT) 453 foundfile = 1; 454 if (lf) { 455 error = linker_file_register_modules(lf); 456 if (error == EEXIST) { 457 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 458 return (error); 459 } 460 modules = !TAILQ_EMPTY(&lf->modules); 461 linker_file_register_sysctls(lf, false); 462 linker_file_sysinit(lf); 463 lf->flags |= LINKER_FILE_LINKED; 464 465 /* 466 * If all of the modules in this file failed 467 * to load, unload the file and return an 468 * error of ENOEXEC. 469 */ 470 if (modules && TAILQ_EMPTY(&lf->modules)) { 471 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 472 return (ENOEXEC); 473 } 474 linker_file_enable_sysctls(lf); 475 EVENTHANDLER_INVOKE(kld_load, lf); 476 *result = lf; 477 return (0); 478 } 479 } 480 /* 481 * Less than ideal, but tells the user whether it failed to load or 482 * the module was not found. 483 */ 484 if (foundfile) { 485 486 /* 487 * If the file type has not been recognized by the last try 488 * printout a message before to fail. 489 */ 490 if (error == ENOSYS) 491 printf("%s: %s - unsupported file type\n", 492 __func__, filename); 493 494 /* 495 * Format not recognized or otherwise unloadable. 496 * When loading a module that is statically built into 497 * the kernel EEXIST percolates back up as the return 498 * value. Preserve this so that apps like sysinstall 499 * can recognize this special case and not post bogus 500 * dialog boxes. 501 */ 502 if (error != EEXIST) 503 error = ENOEXEC; 504 } else 505 error = ENOENT; /* Nothing found */ 506 return (error); 507 } 508 509 int 510 linker_reference_module(const char *modname, struct mod_depend *verinfo, 511 linker_file_t *result) 512 { 513 modlist_t mod; 514 int error; 515 516 sx_xlock(&kld_sx); 517 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 518 *result = mod->container; 519 (*result)->refs++; 520 sx_xunlock(&kld_sx); 521 return (0); 522 } 523 524 error = linker_load_module(NULL, modname, NULL, verinfo, result); 525 sx_xunlock(&kld_sx); 526 return (error); 527 } 528 529 int 530 linker_release_module(const char *modname, struct mod_depend *verinfo, 531 linker_file_t lf) 532 { 533 modlist_t mod; 534 int error; 535 536 sx_xlock(&kld_sx); 537 if (lf == NULL) { 538 KASSERT(modname != NULL, 539 ("linker_release_module: no file or name")); 540 mod = modlist_lookup2(modname, verinfo); 541 if (mod == NULL) { 542 sx_xunlock(&kld_sx); 543 return (ESRCH); 544 } 545 lf = mod->container; 546 } else 547 KASSERT(modname == NULL && verinfo == NULL, 548 ("linker_release_module: both file and name")); 549 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL); 550 sx_xunlock(&kld_sx); 551 return (error); 552 } 553 554 static linker_file_t 555 linker_find_file_by_name(const char *filename) 556 { 557 linker_file_t lf; 558 char *koname; 559 560 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 561 sprintf(koname, "%s.ko", filename); 562 563 sx_assert(&kld_sx, SA_XLOCKED); 564 TAILQ_FOREACH(lf, &linker_files, link) { 565 if (strcmp(lf->filename, koname) == 0) 566 break; 567 if (strcmp(lf->filename, filename) == 0) 568 break; 569 } 570 free(koname, M_LINKER); 571 return (lf); 572 } 573 574 static linker_file_t 575 linker_find_file_by_id(int fileid) 576 { 577 linker_file_t lf; 578 579 sx_assert(&kld_sx, SA_XLOCKED); 580 TAILQ_FOREACH(lf, &linker_files, link) 581 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED) 582 break; 583 return (lf); 584 } 585 586 int 587 linker_file_foreach(linker_predicate_t *predicate, void *context) 588 { 589 linker_file_t lf; 590 int retval = 0; 591 592 sx_xlock(&kld_sx); 593 TAILQ_FOREACH(lf, &linker_files, link) { 594 retval = predicate(lf, context); 595 if (retval != 0) 596 break; 597 } 598 sx_xunlock(&kld_sx); 599 return (retval); 600 } 601 602 linker_file_t 603 linker_make_file(const char *pathname, linker_class_t lc) 604 { 605 linker_file_t lf; 606 const char *filename; 607 608 if (!cold) 609 sx_assert(&kld_sx, SA_XLOCKED); 610 filename = linker_basename(pathname); 611 612 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname)); 613 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 614 if (lf == NULL) 615 return (NULL); 616 lf->ctors_addr = 0; 617 lf->ctors_size = 0; 618 lf->refs = 1; 619 lf->userrefs = 0; 620 lf->flags = 0; 621 lf->filename = strdup(filename, M_LINKER); 622 lf->pathname = strdup(pathname, M_LINKER); 623 LINKER_GET_NEXT_FILE_ID(lf->id); 624 lf->ndeps = 0; 625 lf->deps = NULL; 626 lf->loadcnt = ++loadcnt; 627 #ifdef __arm__ 628 lf->exidx_addr = 0; 629 lf->exidx_size = 0; 630 #endif 631 STAILQ_INIT(&lf->common); 632 TAILQ_INIT(&lf->modules); 633 TAILQ_INSERT_TAIL(&linker_files, lf, link); 634 return (lf); 635 } 636 637 int 638 linker_file_unload(linker_file_t file, int flags) 639 { 640 module_t mod, next; 641 modlist_t ml, nextml; 642 struct common_symbol *cp; 643 int error, i; 644 645 /* Refuse to unload modules if securelevel raised. */ 646 if (prison0.pr_securelevel > 0) 647 return (EPERM); 648 649 sx_assert(&kld_sx, SA_XLOCKED); 650 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 651 652 /* Easy case of just dropping a reference. */ 653 if (file->refs > 1) { 654 file->refs--; 655 return (0); 656 } 657 658 /* Give eventhandlers a chance to prevent the unload. */ 659 error = 0; 660 EVENTHANDLER_INVOKE(kld_unload_try, file, &error); 661 if (error != 0) 662 return (EBUSY); 663 664 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 665 " informing modules\n")); 666 667 /* 668 * Quiesce all the modules to give them a chance to veto the unload. 669 */ 670 MOD_SLOCK; 671 for (mod = TAILQ_FIRST(&file->modules); mod; 672 mod = module_getfnext(mod)) { 673 674 error = module_quiesce(mod); 675 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 676 KLD_DPF(FILE, ("linker_file_unload: module %s" 677 " vetoed unload\n", module_getname(mod))); 678 /* 679 * XXX: Do we need to tell all the quiesced modules 680 * that they can resume work now via a new module 681 * event? 682 */ 683 MOD_SUNLOCK; 684 return (error); 685 } 686 } 687 MOD_SUNLOCK; 688 689 /* 690 * Inform any modules associated with this file that they are 691 * being unloaded. 692 */ 693 MOD_XLOCK; 694 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 695 next = module_getfnext(mod); 696 MOD_XUNLOCK; 697 698 /* 699 * Give the module a chance to veto the unload. 700 */ 701 if ((error = module_unload(mod)) != 0) { 702 #ifdef KLD_DEBUG 703 MOD_SLOCK; 704 KLD_DPF(FILE, ("linker_file_unload: module %s" 705 " failed unload\n", module_getname(mod))); 706 MOD_SUNLOCK; 707 #endif 708 return (error); 709 } 710 MOD_XLOCK; 711 module_release(mod); 712 } 713 MOD_XUNLOCK; 714 715 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 716 if (ml->container == file) { 717 TAILQ_REMOVE(&found_modules, ml, link); 718 free(ml, M_LINKER); 719 } 720 } 721 722 /* 723 * Don't try to run SYSUNINITs if we are unloaded due to a 724 * link error. 725 */ 726 if (file->flags & LINKER_FILE_LINKED) { 727 file->flags &= ~LINKER_FILE_LINKED; 728 linker_file_unregister_sysctls(file); 729 linker_file_sysuninit(file); 730 } 731 TAILQ_REMOVE(&linker_files, file, link); 732 733 if (file->deps) { 734 for (i = 0; i < file->ndeps; i++) 735 linker_file_unload(file->deps[i], flags); 736 free(file->deps, M_LINKER); 737 file->deps = NULL; 738 } 739 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 740 STAILQ_REMOVE_HEAD(&file->common, link); 741 free(cp, M_LINKER); 742 } 743 744 LINKER_UNLOAD(file); 745 746 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address, 747 file->size); 748 749 if (file->filename) { 750 free(file->filename, M_LINKER); 751 file->filename = NULL; 752 } 753 if (file->pathname) { 754 free(file->pathname, M_LINKER); 755 file->pathname = NULL; 756 } 757 kobj_delete((kobj_t) file, M_LINKER); 758 return (0); 759 } 760 761 int 762 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 763 { 764 return (LINKER_CTF_GET(file, lc)); 765 } 766 767 static int 768 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 769 { 770 linker_file_t *newdeps; 771 772 sx_assert(&kld_sx, SA_XLOCKED); 773 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps), 774 M_LINKER, M_WAITOK | M_ZERO); 775 file->deps[file->ndeps] = dep; 776 file->ndeps++; 777 KLD_DPF(FILE, ("linker_file_add_dependency:" 778 " adding %s as dependency for %s\n", 779 dep->filename, file->filename)); 780 return (0); 781 } 782 783 /* 784 * Locate a linker set and its contents. This is a helper function to avoid 785 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 786 * This function is used in this file so we can avoid having lots of (void **) 787 * casts. 788 */ 789 int 790 linker_file_lookup_set(linker_file_t file, const char *name, 791 void *firstp, void *lastp, int *countp) 792 { 793 794 sx_assert(&kld_sx, SA_LOCKED); 795 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 796 } 797 798 /* 799 * List all functions in a file. 800 */ 801 int 802 linker_file_function_listall(linker_file_t lf, 803 linker_function_nameval_callback_t callback_func, void *arg) 804 { 805 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 806 } 807 808 caddr_t 809 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 810 { 811 caddr_t sym; 812 int locked; 813 814 locked = sx_xlocked(&kld_sx); 815 if (!locked) 816 sx_xlock(&kld_sx); 817 sym = linker_file_lookup_symbol_internal(file, name, deps); 818 if (!locked) 819 sx_xunlock(&kld_sx); 820 return (sym); 821 } 822 823 static caddr_t 824 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 825 int deps) 826 { 827 c_linker_sym_t sym; 828 linker_symval_t symval; 829 caddr_t address; 830 size_t common_size = 0; 831 int i; 832 833 sx_assert(&kld_sx, SA_XLOCKED); 834 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 835 file, name, deps)); 836 837 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 838 LINKER_SYMBOL_VALUES(file, sym, &symval); 839 if (symval.value == 0) 840 /* 841 * For commons, first look them up in the 842 * dependencies and only allocate space if not found 843 * there. 844 */ 845 common_size = symval.size; 846 else { 847 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 848 ".value=%p\n", symval.value)); 849 return (symval.value); 850 } 851 } 852 if (deps) { 853 for (i = 0; i < file->ndeps; i++) { 854 address = linker_file_lookup_symbol_internal( 855 file->deps[i], name, 0); 856 if (address) { 857 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 858 " deps value=%p\n", address)); 859 return (address); 860 } 861 } 862 } 863 if (common_size > 0) { 864 /* 865 * This is a common symbol which was not found in the 866 * dependencies. We maintain a simple common symbol table in 867 * the file object. 868 */ 869 struct common_symbol *cp; 870 871 STAILQ_FOREACH(cp, &file->common, link) { 872 if (strcmp(cp->name, name) == 0) { 873 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 874 " old common value=%p\n", cp->address)); 875 return (cp->address); 876 } 877 } 878 /* 879 * Round the symbol size up to align. 880 */ 881 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 882 cp = malloc(sizeof(struct common_symbol) 883 + common_size + strlen(name) + 1, M_LINKER, 884 M_WAITOK | M_ZERO); 885 cp->address = (caddr_t)(cp + 1); 886 cp->name = cp->address + common_size; 887 strcpy(cp->name, name); 888 bzero(cp->address, common_size); 889 STAILQ_INSERT_TAIL(&file->common, cp, link); 890 891 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 892 " value=%p\n", cp->address)); 893 return (cp->address); 894 } 895 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 896 return (0); 897 } 898 899 /* 900 * Both DDB and stack(9) rely on the kernel linker to provide forward and 901 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 902 * do this in a lockfree manner. We provide a set of internal helper 903 * routines to perform these operations without locks, and then wrappers that 904 * optionally lock. 905 * 906 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 907 */ 908 #ifdef DDB 909 static int 910 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 911 { 912 linker_file_t lf; 913 914 TAILQ_FOREACH(lf, &linker_files, link) { 915 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 916 return (0); 917 } 918 return (ENOENT); 919 } 920 #endif 921 922 static int 923 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 924 { 925 linker_file_t lf; 926 c_linker_sym_t best, es; 927 u_long diff, bestdiff, off; 928 929 best = 0; 930 off = (uintptr_t)value; 931 bestdiff = off; 932 TAILQ_FOREACH(lf, &linker_files, link) { 933 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 934 continue; 935 if (es != 0 && diff < bestdiff) { 936 best = es; 937 bestdiff = diff; 938 } 939 if (bestdiff == 0) 940 break; 941 } 942 if (best) { 943 *sym = best; 944 *diffp = bestdiff; 945 return (0); 946 } else { 947 *sym = 0; 948 *diffp = off; 949 return (ENOENT); 950 } 951 } 952 953 static int 954 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 955 { 956 linker_file_t lf; 957 958 TAILQ_FOREACH(lf, &linker_files, link) { 959 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 960 return (0); 961 } 962 return (ENOENT); 963 } 964 965 static int 966 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 967 long *offset) 968 { 969 linker_symval_t symval; 970 c_linker_sym_t sym; 971 int error; 972 973 *offset = 0; 974 error = linker_debug_search_symbol(value, &sym, offset); 975 if (error) 976 return (error); 977 error = linker_debug_symbol_values(sym, &symval); 978 if (error) 979 return (error); 980 strlcpy(buf, symval.name, buflen); 981 return (0); 982 } 983 984 /* 985 * DDB Helpers. DDB has to look across multiple files with their own symbol 986 * tables and string tables. 987 * 988 * Note that we do not obey list locking protocols here. We really don't need 989 * DDB to hang because somebody's got the lock held. We'll take the chance 990 * that the files list is inconsistent instead. 991 */ 992 #ifdef DDB 993 int 994 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 995 { 996 997 return (linker_debug_lookup(symstr, sym)); 998 } 999 #endif 1000 1001 int 1002 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 1003 { 1004 1005 return (linker_debug_search_symbol(value, sym, diffp)); 1006 } 1007 1008 int 1009 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 1010 { 1011 1012 return (linker_debug_symbol_values(sym, symval)); 1013 } 1014 1015 int 1016 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1017 long *offset) 1018 { 1019 1020 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 1021 } 1022 1023 /* 1024 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 1025 * obey locking protocols, and offer a significantly less complex interface. 1026 */ 1027 int 1028 linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen, 1029 long *offset, int flags) 1030 { 1031 int error; 1032 1033 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 && 1034 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK), 1035 ("%s: bad flags: 0x%x", __func__, flags)); 1036 1037 if (flags & M_NOWAIT) { 1038 if (!sx_try_slock(&kld_sx)) 1039 return (EWOULDBLOCK); 1040 } else 1041 sx_slock(&kld_sx); 1042 1043 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 1044 sx_sunlock(&kld_sx); 1045 return (error); 1046 } 1047 1048 int 1049 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1050 long *offset) 1051 { 1052 1053 return (linker_search_symbol_name_flags(value, buf, buflen, offset, 1054 M_WAITOK)); 1055 } 1056 1057 /* 1058 * Syscalls. 1059 */ 1060 int 1061 kern_kldload(struct thread *td, const char *file, int *fileid) 1062 { 1063 const char *kldname, *modname; 1064 linker_file_t lf; 1065 int error; 1066 1067 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1068 return (error); 1069 1070 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1071 return (error); 1072 1073 /* 1074 * It is possible that kldloaded module will attach a new ifnet, 1075 * so vnet context must be set when this ocurs. 1076 */ 1077 CURVNET_SET(TD_TO_VNET(td)); 1078 1079 /* 1080 * If file does not contain a qualified name or any dot in it 1081 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1082 * name. 1083 */ 1084 if (strchr(file, '/') || strchr(file, '.')) { 1085 kldname = file; 1086 modname = NULL; 1087 } else { 1088 kldname = NULL; 1089 modname = file; 1090 } 1091 1092 sx_xlock(&kld_sx); 1093 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1094 if (error) { 1095 sx_xunlock(&kld_sx); 1096 goto done; 1097 } 1098 lf->userrefs++; 1099 if (fileid != NULL) 1100 *fileid = lf->id; 1101 sx_xunlock(&kld_sx); 1102 1103 done: 1104 CURVNET_RESTORE(); 1105 return (error); 1106 } 1107 1108 int 1109 sys_kldload(struct thread *td, struct kldload_args *uap) 1110 { 1111 char *pathname = NULL; 1112 int error, fileid; 1113 1114 td->td_retval[0] = -1; 1115 1116 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1117 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1118 if (error == 0) { 1119 error = kern_kldload(td, pathname, &fileid); 1120 if (error == 0) 1121 td->td_retval[0] = fileid; 1122 } 1123 free(pathname, M_TEMP); 1124 return (error); 1125 } 1126 1127 int 1128 kern_kldunload(struct thread *td, int fileid, int flags) 1129 { 1130 linker_file_t lf; 1131 int error = 0; 1132 1133 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1134 return (error); 1135 1136 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1137 return (error); 1138 1139 CURVNET_SET(TD_TO_VNET(td)); 1140 sx_xlock(&kld_sx); 1141 lf = linker_find_file_by_id(fileid); 1142 if (lf) { 1143 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1144 1145 if (lf->userrefs == 0) { 1146 /* 1147 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1148 */ 1149 printf("kldunload: attempt to unload file that was" 1150 " loaded by the kernel\n"); 1151 error = EBUSY; 1152 } else { 1153 lf->userrefs--; 1154 error = linker_file_unload(lf, flags); 1155 if (error) 1156 lf->userrefs++; 1157 } 1158 } else 1159 error = ENOENT; 1160 sx_xunlock(&kld_sx); 1161 1162 CURVNET_RESTORE(); 1163 return (error); 1164 } 1165 1166 int 1167 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1168 { 1169 1170 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1171 } 1172 1173 int 1174 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1175 { 1176 1177 if (uap->flags != LINKER_UNLOAD_NORMAL && 1178 uap->flags != LINKER_UNLOAD_FORCE) 1179 return (EINVAL); 1180 return (kern_kldunload(td, uap->fileid, uap->flags)); 1181 } 1182 1183 int 1184 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1185 { 1186 char *pathname; 1187 const char *filename; 1188 linker_file_t lf; 1189 int error; 1190 1191 #ifdef MAC 1192 error = mac_kld_check_stat(td->td_ucred); 1193 if (error) 1194 return (error); 1195 #endif 1196 1197 td->td_retval[0] = -1; 1198 1199 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1200 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1201 goto out; 1202 1203 filename = linker_basename(pathname); 1204 sx_xlock(&kld_sx); 1205 lf = linker_find_file_by_name(filename); 1206 if (lf) 1207 td->td_retval[0] = lf->id; 1208 else 1209 error = ENOENT; 1210 sx_xunlock(&kld_sx); 1211 out: 1212 free(pathname, M_TEMP); 1213 return (error); 1214 } 1215 1216 int 1217 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1218 { 1219 linker_file_t lf; 1220 int error = 0; 1221 1222 #ifdef MAC 1223 error = mac_kld_check_stat(td->td_ucred); 1224 if (error) 1225 return (error); 1226 #endif 1227 1228 sx_xlock(&kld_sx); 1229 if (uap->fileid == 0) 1230 lf = TAILQ_FIRST(&linker_files); 1231 else { 1232 lf = linker_find_file_by_id(uap->fileid); 1233 if (lf == NULL) { 1234 error = ENOENT; 1235 goto out; 1236 } 1237 lf = TAILQ_NEXT(lf, link); 1238 } 1239 1240 /* Skip partially loaded files. */ 1241 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1242 lf = TAILQ_NEXT(lf, link); 1243 1244 if (lf) 1245 td->td_retval[0] = lf->id; 1246 else 1247 td->td_retval[0] = 0; 1248 out: 1249 sx_xunlock(&kld_sx); 1250 return (error); 1251 } 1252 1253 int 1254 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1255 { 1256 struct kld_file_stat *stat; 1257 int error, version; 1258 1259 /* 1260 * Check the version of the user's structure. 1261 */ 1262 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1263 != 0) 1264 return (error); 1265 if (version != sizeof(struct kld_file_stat_1) && 1266 version != sizeof(struct kld_file_stat)) 1267 return (EINVAL); 1268 1269 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO); 1270 error = kern_kldstat(td, uap->fileid, stat); 1271 if (error == 0) 1272 error = copyout(stat, uap->stat, version); 1273 free(stat, M_TEMP); 1274 return (error); 1275 } 1276 1277 int 1278 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat) 1279 { 1280 linker_file_t lf; 1281 int namelen; 1282 #ifdef MAC 1283 int error; 1284 1285 error = mac_kld_check_stat(td->td_ucred); 1286 if (error) 1287 return (error); 1288 #endif 1289 1290 sx_xlock(&kld_sx); 1291 lf = linker_find_file_by_id(fileid); 1292 if (lf == NULL) { 1293 sx_xunlock(&kld_sx); 1294 return (ENOENT); 1295 } 1296 1297 /* Version 1 fields: */ 1298 namelen = strlen(lf->filename) + 1; 1299 if (namelen > sizeof(stat->name)) 1300 namelen = sizeof(stat->name); 1301 bcopy(lf->filename, &stat->name[0], namelen); 1302 stat->refs = lf->refs; 1303 stat->id = lf->id; 1304 stat->address = lf->address; 1305 stat->size = lf->size; 1306 /* Version 2 fields: */ 1307 namelen = strlen(lf->pathname) + 1; 1308 if (namelen > sizeof(stat->pathname)) 1309 namelen = sizeof(stat->pathname); 1310 bcopy(lf->pathname, &stat->pathname[0], namelen); 1311 sx_xunlock(&kld_sx); 1312 1313 td->td_retval[0] = 0; 1314 return (0); 1315 } 1316 1317 #ifdef DDB 1318 DB_COMMAND(kldstat, db_kldstat) 1319 { 1320 linker_file_t lf; 1321 1322 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2)) 1323 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' '); 1324 #undef POINTER_WIDTH 1325 TAILQ_FOREACH(lf, &linker_files, link) { 1326 if (db_pager_quit) 1327 return; 1328 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs, 1329 lf->address, lf->size, lf->filename); 1330 } 1331 } 1332 #endif /* DDB */ 1333 1334 int 1335 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1336 { 1337 linker_file_t lf; 1338 module_t mp; 1339 int error = 0; 1340 1341 #ifdef MAC 1342 error = mac_kld_check_stat(td->td_ucred); 1343 if (error) 1344 return (error); 1345 #endif 1346 1347 sx_xlock(&kld_sx); 1348 lf = linker_find_file_by_id(uap->fileid); 1349 if (lf) { 1350 MOD_SLOCK; 1351 mp = TAILQ_FIRST(&lf->modules); 1352 if (mp != NULL) 1353 td->td_retval[0] = module_getid(mp); 1354 else 1355 td->td_retval[0] = 0; 1356 MOD_SUNLOCK; 1357 } else 1358 error = ENOENT; 1359 sx_xunlock(&kld_sx); 1360 return (error); 1361 } 1362 1363 int 1364 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1365 { 1366 char *symstr = NULL; 1367 c_linker_sym_t sym; 1368 linker_symval_t symval; 1369 linker_file_t lf; 1370 struct kld_sym_lookup lookup; 1371 int error = 0; 1372 1373 #ifdef MAC 1374 error = mac_kld_check_stat(td->td_ucred); 1375 if (error) 1376 return (error); 1377 #endif 1378 1379 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1380 return (error); 1381 if (lookup.version != sizeof(lookup) || 1382 uap->cmd != KLDSYM_LOOKUP) 1383 return (EINVAL); 1384 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1385 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1386 goto out; 1387 sx_xlock(&kld_sx); 1388 if (uap->fileid != 0) { 1389 lf = linker_find_file_by_id(uap->fileid); 1390 if (lf == NULL) 1391 error = ENOENT; 1392 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1393 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1394 lookup.symvalue = (uintptr_t) symval.value; 1395 lookup.symsize = symval.size; 1396 error = copyout(&lookup, uap->data, sizeof(lookup)); 1397 } else 1398 error = ENOENT; 1399 } else { 1400 TAILQ_FOREACH(lf, &linker_files, link) { 1401 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1402 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1403 lookup.symvalue = (uintptr_t)symval.value; 1404 lookup.symsize = symval.size; 1405 error = copyout(&lookup, uap->data, 1406 sizeof(lookup)); 1407 break; 1408 } 1409 } 1410 if (lf == NULL) 1411 error = ENOENT; 1412 } 1413 sx_xunlock(&kld_sx); 1414 out: 1415 free(symstr, M_TEMP); 1416 return (error); 1417 } 1418 1419 /* 1420 * Preloaded module support 1421 */ 1422 1423 static modlist_t 1424 modlist_lookup(const char *name, int ver) 1425 { 1426 modlist_t mod; 1427 1428 TAILQ_FOREACH(mod, &found_modules, link) { 1429 if (strcmp(mod->name, name) == 0 && 1430 (ver == 0 || mod->version == ver)) 1431 return (mod); 1432 } 1433 return (NULL); 1434 } 1435 1436 static modlist_t 1437 modlist_lookup2(const char *name, const struct mod_depend *verinfo) 1438 { 1439 modlist_t mod, bestmod; 1440 int ver; 1441 1442 if (verinfo == NULL) 1443 return (modlist_lookup(name, 0)); 1444 bestmod = NULL; 1445 TAILQ_FOREACH(mod, &found_modules, link) { 1446 if (strcmp(mod->name, name) != 0) 1447 continue; 1448 ver = mod->version; 1449 if (ver == verinfo->md_ver_preferred) 1450 return (mod); 1451 if (ver >= verinfo->md_ver_minimum && 1452 ver <= verinfo->md_ver_maximum && 1453 (bestmod == NULL || ver > bestmod->version)) 1454 bestmod = mod; 1455 } 1456 return (bestmod); 1457 } 1458 1459 static modlist_t 1460 modlist_newmodule(const char *modname, int version, linker_file_t container) 1461 { 1462 modlist_t mod; 1463 1464 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1465 if (mod == NULL) 1466 panic("no memory for module list"); 1467 mod->container = container; 1468 mod->name = modname; 1469 mod->version = version; 1470 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1471 return (mod); 1472 } 1473 1474 static void 1475 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1476 struct mod_metadata **stop, int preload) 1477 { 1478 struct mod_metadata *mp, **mdp; 1479 const char *modname; 1480 int ver; 1481 1482 for (mdp = start; mdp < stop; mdp++) { 1483 mp = *mdp; 1484 if (mp->md_type != MDT_VERSION) 1485 continue; 1486 modname = mp->md_cval; 1487 ver = ((const struct mod_version *)mp->md_data)->mv_version; 1488 if (modlist_lookup(modname, ver) != NULL) { 1489 printf("module %s already present!\n", modname); 1490 /* XXX what can we do? this is a build error. :-( */ 1491 continue; 1492 } 1493 modlist_newmodule(modname, ver, lf); 1494 } 1495 } 1496 1497 static void 1498 linker_preload(void *arg) 1499 { 1500 caddr_t modptr; 1501 const char *modname, *nmodname; 1502 char *modtype; 1503 linker_file_t lf, nlf; 1504 linker_class_t lc; 1505 int error; 1506 linker_file_list_t loaded_files; 1507 linker_file_list_t depended_files; 1508 struct mod_metadata *mp, *nmp; 1509 struct mod_metadata **start, **stop, **mdp, **nmdp; 1510 const struct mod_depend *verinfo; 1511 int nver; 1512 int resolves; 1513 modlist_t mod; 1514 struct sysinit **si_start, **si_stop; 1515 1516 TAILQ_INIT(&loaded_files); 1517 TAILQ_INIT(&depended_files); 1518 TAILQ_INIT(&found_modules); 1519 error = 0; 1520 1521 modptr = NULL; 1522 sx_xlock(&kld_sx); 1523 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1524 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1525 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1526 if (modname == NULL) { 1527 printf("Preloaded module at %p does not have a" 1528 " name!\n", modptr); 1529 continue; 1530 } 1531 if (modtype == NULL) { 1532 printf("Preloaded module at %p does not have a type!\n", 1533 modptr); 1534 continue; 1535 } 1536 if (bootverbose) 1537 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1538 modptr); 1539 lf = NULL; 1540 TAILQ_FOREACH(lc, &classes, link) { 1541 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1542 if (!error) 1543 break; 1544 lf = NULL; 1545 } 1546 if (lf) 1547 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1548 } 1549 1550 /* 1551 * First get a list of stuff in the kernel. 1552 */ 1553 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1554 &stop, NULL) == 0) 1555 linker_addmodules(linker_kernel_file, start, stop, 1); 1556 1557 /* 1558 * This is a once-off kinky bubble sort to resolve relocation 1559 * dependency requirements. 1560 */ 1561 restart: 1562 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1563 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1564 &stop, NULL); 1565 /* 1566 * First, look to see if we would successfully link with this 1567 * stuff. 1568 */ 1569 resolves = 1; /* unless we know otherwise */ 1570 if (!error) { 1571 for (mdp = start; mdp < stop; mdp++) { 1572 mp = *mdp; 1573 if (mp->md_type != MDT_DEPEND) 1574 continue; 1575 modname = mp->md_cval; 1576 verinfo = mp->md_data; 1577 for (nmdp = start; nmdp < stop; nmdp++) { 1578 nmp = *nmdp; 1579 if (nmp->md_type != MDT_VERSION) 1580 continue; 1581 nmodname = nmp->md_cval; 1582 if (strcmp(modname, nmodname) == 0) 1583 break; 1584 } 1585 if (nmdp < stop) /* it's a self reference */ 1586 continue; 1587 1588 /* 1589 * ok, the module isn't here yet, we 1590 * are not finished 1591 */ 1592 if (modlist_lookup2(modname, verinfo) == NULL) 1593 resolves = 0; 1594 } 1595 } 1596 /* 1597 * OK, if we found our modules, we can link. So, "provide" 1598 * the modules inside and add it to the end of the link order 1599 * list. 1600 */ 1601 if (resolves) { 1602 if (!error) { 1603 for (mdp = start; mdp < stop; mdp++) { 1604 mp = *mdp; 1605 if (mp->md_type != MDT_VERSION) 1606 continue; 1607 modname = mp->md_cval; 1608 nver = ((const struct mod_version *) 1609 mp->md_data)->mv_version; 1610 if (modlist_lookup(modname, 1611 nver) != NULL) { 1612 printf("module %s already" 1613 " present!\n", modname); 1614 TAILQ_REMOVE(&loaded_files, 1615 lf, loaded); 1616 linker_file_unload(lf, 1617 LINKER_UNLOAD_FORCE); 1618 /* we changed tailq next ptr */ 1619 goto restart; 1620 } 1621 modlist_newmodule(modname, nver, lf); 1622 } 1623 } 1624 TAILQ_REMOVE(&loaded_files, lf, loaded); 1625 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1626 /* 1627 * Since we provided modules, we need to restart the 1628 * sort so that the previous files that depend on us 1629 * have a chance. Also, we've busted the tailq next 1630 * pointer with the REMOVE. 1631 */ 1632 goto restart; 1633 } 1634 } 1635 1636 /* 1637 * At this point, we check to see what could not be resolved.. 1638 */ 1639 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1640 TAILQ_REMOVE(&loaded_files, lf, loaded); 1641 printf("KLD file %s is missing dependencies\n", lf->filename); 1642 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1643 } 1644 1645 /* 1646 * We made it. Finish off the linking in the order we determined. 1647 */ 1648 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1649 if (linker_kernel_file) { 1650 linker_kernel_file->refs++; 1651 error = linker_file_add_dependency(lf, 1652 linker_kernel_file); 1653 if (error) 1654 panic("cannot add dependency"); 1655 } 1656 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1657 &stop, NULL); 1658 if (!error) { 1659 for (mdp = start; mdp < stop; mdp++) { 1660 mp = *mdp; 1661 if (mp->md_type != MDT_DEPEND) 1662 continue; 1663 modname = mp->md_cval; 1664 verinfo = mp->md_data; 1665 mod = modlist_lookup2(modname, verinfo); 1666 if (mod == NULL) { 1667 printf("KLD file %s - cannot find " 1668 "dependency \"%s\"\n", 1669 lf->filename, modname); 1670 goto fail; 1671 } 1672 /* Don't count self-dependencies */ 1673 if (lf == mod->container) 1674 continue; 1675 mod->container->refs++; 1676 error = linker_file_add_dependency(lf, 1677 mod->container); 1678 if (error) 1679 panic("cannot add dependency"); 1680 } 1681 } 1682 /* 1683 * Now do relocation etc using the symbol search paths 1684 * established by the dependencies 1685 */ 1686 error = LINKER_LINK_PRELOAD_FINISH(lf); 1687 if (error) { 1688 printf("KLD file %s - could not finalize loading\n", 1689 lf->filename); 1690 goto fail; 1691 } 1692 linker_file_register_modules(lf); 1693 if (!TAILQ_EMPTY(&lf->modules)) 1694 lf->flags |= LINKER_FILE_MODULES; 1695 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1696 &si_stop, NULL) == 0) 1697 sysinit_add(si_start, si_stop); 1698 linker_file_register_sysctls(lf, true); 1699 lf->flags |= LINKER_FILE_LINKED; 1700 continue; 1701 fail: 1702 TAILQ_REMOVE(&depended_files, lf, loaded); 1703 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1704 } 1705 sx_xunlock(&kld_sx); 1706 /* woohoo! we made it! */ 1707 } 1708 1709 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL); 1710 1711 /* 1712 * Handle preload files that failed to load any modules. 1713 */ 1714 static void 1715 linker_preload_finish(void *arg) 1716 { 1717 linker_file_t lf, nlf; 1718 1719 sx_xlock(&kld_sx); 1720 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) { 1721 /* 1722 * If all of the modules in this file failed to load, unload 1723 * the file and return an error of ENOEXEC. (Parity with 1724 * linker_load_file.) 1725 */ 1726 if ((lf->flags & LINKER_FILE_MODULES) != 0 && 1727 TAILQ_EMPTY(&lf->modules)) { 1728 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1729 continue; 1730 } 1731 1732 lf->flags &= ~LINKER_FILE_MODULES; 1733 lf->userrefs++; /* so we can (try to) kldunload it */ 1734 } 1735 sx_xunlock(&kld_sx); 1736 } 1737 1738 /* 1739 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be 1740 * scheduled at any subsystem and order, so run this as late as possible. init 1741 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that. 1742 */ 1743 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE, 1744 linker_preload_finish, NULL); 1745 1746 /* 1747 * Search for a not-loaded module by name. 1748 * 1749 * Modules may be found in the following locations: 1750 * 1751 * - preloaded (result is just the module name) - on disk (result is full path 1752 * to module) 1753 * 1754 * If the module name is qualified in any way (contains path, etc.) the we 1755 * simply return a copy of it. 1756 * 1757 * The search path can be manipulated via sysctl. Note that we use the ';' 1758 * character as a separator to be consistent with the bootloader. 1759 */ 1760 1761 static char linker_hintfile[] = "linker.hints"; 1762 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1763 1764 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path, 1765 sizeof(linker_path), "module load search path"); 1766 1767 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1768 1769 static char *linker_ext_list[] = { 1770 "", 1771 ".ko", 1772 NULL 1773 }; 1774 1775 /* 1776 * Check if file actually exists either with or without extension listed in 1777 * the linker_ext_list. (probably should be generic for the rest of the 1778 * kernel) 1779 */ 1780 static char * 1781 linker_lookup_file(const char *path, int pathlen, const char *name, 1782 int namelen, struct vattr *vap) 1783 { 1784 struct nameidata nd; 1785 struct thread *td = curthread; /* XXX */ 1786 char *result, **cpp, *sep; 1787 int error, len, extlen, reclen, flags; 1788 enum vtype type; 1789 1790 extlen = 0; 1791 for (cpp = linker_ext_list; *cpp; cpp++) { 1792 len = strlen(*cpp); 1793 if (len > extlen) 1794 extlen = len; 1795 } 1796 extlen++; /* trailing '\0' */ 1797 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1798 1799 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1800 result = malloc(reclen, M_LINKER, M_WAITOK); 1801 for (cpp = linker_ext_list; *cpp; cpp++) { 1802 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1803 namelen, name, *cpp); 1804 /* 1805 * Attempt to open the file, and return the path if 1806 * we succeed and it's a regular file. 1807 */ 1808 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1809 flags = FREAD; 1810 error = vn_open(&nd, &flags, 0, NULL); 1811 if (error == 0) { 1812 NDFREE(&nd, NDF_ONLY_PNBUF); 1813 type = nd.ni_vp->v_type; 1814 if (vap) 1815 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1816 VOP_UNLOCK(nd.ni_vp, 0); 1817 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1818 if (type == VREG) 1819 return (result); 1820 } 1821 } 1822 free(result, M_LINKER); 1823 return (NULL); 1824 } 1825 1826 #define INT_ALIGN(base, ptr) ptr = \ 1827 (base) + roundup2((ptr) - (base), sizeof(int)) 1828 1829 /* 1830 * Lookup KLD which contains requested module in the "linker.hints" file. If 1831 * version specification is available, then try to find the best KLD. 1832 * Otherwise just find the latest one. 1833 */ 1834 static char * 1835 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1836 int modnamelen, const struct mod_depend *verinfo) 1837 { 1838 struct thread *td = curthread; /* XXX */ 1839 struct ucred *cred = td ? td->td_ucred : NULL; 1840 struct nameidata nd; 1841 struct vattr vattr, mattr; 1842 u_char *hints = NULL; 1843 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1844 int error, ival, bestver, *intp, found, flags, clen, blen; 1845 ssize_t reclen; 1846 1847 result = NULL; 1848 bestver = found = 0; 1849 1850 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1851 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1852 strlen(sep) + 1; 1853 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1854 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1855 linker_hintfile); 1856 1857 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1858 flags = FREAD; 1859 error = vn_open(&nd, &flags, 0, NULL); 1860 if (error) 1861 goto bad; 1862 NDFREE(&nd, NDF_ONLY_PNBUF); 1863 if (nd.ni_vp->v_type != VREG) 1864 goto bad; 1865 best = cp = NULL; 1866 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1867 if (error) 1868 goto bad; 1869 /* 1870 * XXX: we need to limit this number to some reasonable value 1871 */ 1872 if (vattr.va_size > LINKER_HINTS_MAX) { 1873 printf("hints file too large %ld\n", (long)vattr.va_size); 1874 goto bad; 1875 } 1876 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1877 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1878 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1879 if (error) 1880 goto bad; 1881 VOP_UNLOCK(nd.ni_vp, 0); 1882 vn_close(nd.ni_vp, FREAD, cred, td); 1883 nd.ni_vp = NULL; 1884 if (reclen != 0) { 1885 printf("can't read %zd\n", reclen); 1886 goto bad; 1887 } 1888 intp = (int *)hints; 1889 ival = *intp++; 1890 if (ival != LINKER_HINTS_VERSION) { 1891 printf("hints file version mismatch %d\n", ival); 1892 goto bad; 1893 } 1894 bufend = hints + vattr.va_size; 1895 recptr = (u_char *)intp; 1896 clen = blen = 0; 1897 while (recptr < bufend && !found) { 1898 intp = (int *)recptr; 1899 reclen = *intp++; 1900 ival = *intp++; 1901 cp = (char *)intp; 1902 switch (ival) { 1903 case MDT_VERSION: 1904 clen = *cp++; 1905 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1906 break; 1907 cp += clen; 1908 INT_ALIGN(hints, cp); 1909 ival = *(int *)cp; 1910 cp += sizeof(int); 1911 clen = *cp++; 1912 if (verinfo == NULL || 1913 ival == verinfo->md_ver_preferred) { 1914 found = 1; 1915 break; 1916 } 1917 if (ival >= verinfo->md_ver_minimum && 1918 ival <= verinfo->md_ver_maximum && 1919 ival > bestver) { 1920 bestver = ival; 1921 best = cp; 1922 blen = clen; 1923 } 1924 break; 1925 default: 1926 break; 1927 } 1928 recptr += reclen + sizeof(int); 1929 } 1930 /* 1931 * Finally check if KLD is in the place 1932 */ 1933 if (found) 1934 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1935 else if (best) 1936 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1937 1938 /* 1939 * KLD is newer than hints file. What we should do now? 1940 */ 1941 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1942 printf("warning: KLD '%s' is newer than the linker.hints" 1943 " file\n", result); 1944 bad: 1945 free(pathbuf, M_LINKER); 1946 if (hints) 1947 free(hints, M_TEMP); 1948 if (nd.ni_vp != NULL) { 1949 VOP_UNLOCK(nd.ni_vp, 0); 1950 vn_close(nd.ni_vp, FREAD, cred, td); 1951 } 1952 /* 1953 * If nothing found or hints is absent - fallback to the old 1954 * way by using "kldname[.ko]" as module name. 1955 */ 1956 if (!found && !bestver && result == NULL) 1957 result = linker_lookup_file(path, pathlen, modname, 1958 modnamelen, NULL); 1959 return (result); 1960 } 1961 1962 /* 1963 * Lookup KLD which contains requested module in the all directories. 1964 */ 1965 static char * 1966 linker_search_module(const char *modname, int modnamelen, 1967 const struct mod_depend *verinfo) 1968 { 1969 char *cp, *ep, *result; 1970 1971 /* 1972 * traverse the linker path 1973 */ 1974 for (cp = linker_path; *cp; cp = ep + 1) { 1975 /* find the end of this component */ 1976 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1977 result = linker_hints_lookup(cp, ep - cp, modname, 1978 modnamelen, verinfo); 1979 if (result != NULL) 1980 return (result); 1981 if (*ep == 0) 1982 break; 1983 } 1984 return (NULL); 1985 } 1986 1987 /* 1988 * Search for module in all directories listed in the linker_path. 1989 */ 1990 static char * 1991 linker_search_kld(const char *name) 1992 { 1993 char *cp, *ep, *result; 1994 int len; 1995 1996 /* qualified at all? */ 1997 if (strchr(name, '/')) 1998 return (strdup(name, M_LINKER)); 1999 2000 /* traverse the linker path */ 2001 len = strlen(name); 2002 for (ep = linker_path; *ep; ep++) { 2003 cp = ep; 2004 /* find the end of this component */ 2005 for (; *ep != 0 && *ep != ';'; ep++); 2006 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 2007 if (result != NULL) 2008 return (result); 2009 } 2010 return (NULL); 2011 } 2012 2013 static const char * 2014 linker_basename(const char *path) 2015 { 2016 const char *filename; 2017 2018 filename = strrchr(path, '/'); 2019 if (filename == NULL) 2020 return path; 2021 if (filename[1]) 2022 filename++; 2023 return (filename); 2024 } 2025 2026 #ifdef HWPMC_HOOKS 2027 /* 2028 * Inform hwpmc about the set of kernel modules currently loaded. 2029 */ 2030 void * 2031 linker_hwpmc_list_objects(void) 2032 { 2033 linker_file_t lf; 2034 struct pmckern_map_in *kobase; 2035 int i, nmappings; 2036 2037 nmappings = 0; 2038 sx_slock(&kld_sx); 2039 TAILQ_FOREACH(lf, &linker_files, link) 2040 nmappings++; 2041 2042 /* Allocate nmappings + 1 entries. */ 2043 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 2044 M_LINKER, M_WAITOK | M_ZERO); 2045 i = 0; 2046 TAILQ_FOREACH(lf, &linker_files, link) { 2047 2048 /* Save the info for this linker file. */ 2049 kobase[i].pm_file = lf->filename; 2050 kobase[i].pm_address = (uintptr_t)lf->address; 2051 i++; 2052 } 2053 sx_sunlock(&kld_sx); 2054 2055 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 2056 2057 /* The last entry of the malloced area comprises of all zeros. */ 2058 KASSERT(kobase[i].pm_file == NULL, 2059 ("linker_hwpmc_list_objects: last object not NULL")); 2060 2061 return ((void *)kobase); 2062 } 2063 #endif 2064 2065 /* 2066 * Find a file which contains given module and load it, if "parent" is not 2067 * NULL, register a reference to it. 2068 */ 2069 static int 2070 linker_load_module(const char *kldname, const char *modname, 2071 struct linker_file *parent, const struct mod_depend *verinfo, 2072 struct linker_file **lfpp) 2073 { 2074 linker_file_t lfdep; 2075 const char *filename; 2076 char *pathname; 2077 int error; 2078 2079 sx_assert(&kld_sx, SA_XLOCKED); 2080 if (modname == NULL) { 2081 /* 2082 * We have to load KLD 2083 */ 2084 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 2085 " is not NULL")); 2086 /* check if root file system is not mounted */ 2087 if (rootvnode == NULL || curproc->p_fd->fd_rdir == NULL) 2088 return (ENXIO); 2089 pathname = linker_search_kld(kldname); 2090 } else { 2091 if (modlist_lookup2(modname, verinfo) != NULL) 2092 return (EEXIST); 2093 /* check if root file system is not mounted */ 2094 if (rootvnode == NULL || curproc->p_fd->fd_rdir == NULL) 2095 return (ENXIO); 2096 if (kldname != NULL) 2097 pathname = strdup(kldname, M_LINKER); 2098 else 2099 /* 2100 * Need to find a KLD with required module 2101 */ 2102 pathname = linker_search_module(modname, 2103 strlen(modname), verinfo); 2104 } 2105 if (pathname == NULL) 2106 return (ENOENT); 2107 2108 /* 2109 * Can't load more than one file with the same basename XXX: 2110 * Actually it should be possible to have multiple KLDs with 2111 * the same basename but different path because they can 2112 * provide different versions of the same modules. 2113 */ 2114 filename = linker_basename(pathname); 2115 if (linker_find_file_by_name(filename)) 2116 error = EEXIST; 2117 else do { 2118 error = linker_load_file(pathname, &lfdep); 2119 if (error) 2120 break; 2121 if (modname && verinfo && 2122 modlist_lookup2(modname, verinfo) == NULL) { 2123 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2124 error = ENOENT; 2125 break; 2126 } 2127 if (parent) { 2128 error = linker_file_add_dependency(parent, lfdep); 2129 if (error) 2130 break; 2131 } 2132 if (lfpp) 2133 *lfpp = lfdep; 2134 } while (0); 2135 free(pathname, M_LINKER); 2136 return (error); 2137 } 2138 2139 /* 2140 * This routine is responsible for finding dependencies of userland initiated 2141 * kldload(2)'s of files. 2142 */ 2143 int 2144 linker_load_dependencies(linker_file_t lf) 2145 { 2146 linker_file_t lfdep; 2147 struct mod_metadata **start, **stop, **mdp, **nmdp; 2148 struct mod_metadata *mp, *nmp; 2149 const struct mod_depend *verinfo; 2150 modlist_t mod; 2151 const char *modname, *nmodname; 2152 int ver, error = 0; 2153 2154 /* 2155 * All files are dependent on /kernel. 2156 */ 2157 sx_assert(&kld_sx, SA_XLOCKED); 2158 if (linker_kernel_file) { 2159 linker_kernel_file->refs++; 2160 error = linker_file_add_dependency(lf, linker_kernel_file); 2161 if (error) 2162 return (error); 2163 } 2164 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2165 NULL) != 0) 2166 return (0); 2167 for (mdp = start; mdp < stop; mdp++) { 2168 mp = *mdp; 2169 if (mp->md_type != MDT_VERSION) 2170 continue; 2171 modname = mp->md_cval; 2172 ver = ((const struct mod_version *)mp->md_data)->mv_version; 2173 mod = modlist_lookup(modname, ver); 2174 if (mod != NULL) { 2175 printf("interface %s.%d already present in the KLD" 2176 " '%s'!\n", modname, ver, 2177 mod->container->filename); 2178 return (EEXIST); 2179 } 2180 } 2181 2182 for (mdp = start; mdp < stop; mdp++) { 2183 mp = *mdp; 2184 if (mp->md_type != MDT_DEPEND) 2185 continue; 2186 modname = mp->md_cval; 2187 verinfo = mp->md_data; 2188 nmodname = NULL; 2189 for (nmdp = start; nmdp < stop; nmdp++) { 2190 nmp = *nmdp; 2191 if (nmp->md_type != MDT_VERSION) 2192 continue; 2193 nmodname = nmp->md_cval; 2194 if (strcmp(modname, nmodname) == 0) 2195 break; 2196 } 2197 if (nmdp < stop)/* early exit, it's a self reference */ 2198 continue; 2199 mod = modlist_lookup2(modname, verinfo); 2200 if (mod) { /* woohoo, it's loaded already */ 2201 lfdep = mod->container; 2202 lfdep->refs++; 2203 error = linker_file_add_dependency(lf, lfdep); 2204 if (error) 2205 break; 2206 continue; 2207 } 2208 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2209 if (error) { 2210 printf("KLD %s: depends on %s - not available or" 2211 " version mismatch\n", lf->filename, modname); 2212 break; 2213 } 2214 } 2215 2216 if (error) 2217 return (error); 2218 linker_addmodules(lf, start, stop, 0); 2219 return (error); 2220 } 2221 2222 static int 2223 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2224 { 2225 struct sysctl_req *req; 2226 2227 req = opaque; 2228 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2229 } 2230 2231 /* 2232 * Export a nul-separated, double-nul-terminated list of all function names 2233 * in the kernel. 2234 */ 2235 static int 2236 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2237 { 2238 linker_file_t lf; 2239 int error; 2240 2241 #ifdef MAC 2242 error = mac_kld_check_stat(req->td->td_ucred); 2243 if (error) 2244 return (error); 2245 #endif 2246 error = sysctl_wire_old_buffer(req, 0); 2247 if (error != 0) 2248 return (error); 2249 sx_xlock(&kld_sx); 2250 TAILQ_FOREACH(lf, &linker_files, link) { 2251 error = LINKER_EACH_FUNCTION_NAME(lf, 2252 sysctl_kern_function_list_iterate, req); 2253 if (error) { 2254 sx_xunlock(&kld_sx); 2255 return (error); 2256 } 2257 } 2258 sx_xunlock(&kld_sx); 2259 return (SYSCTL_OUT(req, "", 1)); 2260 } 2261 2262 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD, 2263 NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 2264