1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include "opt_ddb.h" 31 #include "opt_kld.h" 32 #include "opt_hwpmc_hooks.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/boottrace.h> 37 #include <sys/eventhandler.h> 38 #include <sys/fcntl.h> 39 #include <sys/jail.h> 40 #include <sys/kernel.h> 41 #include <sys/libkern.h> 42 #include <sys/linker.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/module.h> 46 #include <sys/mount.h> 47 #include <sys/mutex.h> 48 #include <sys/namei.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/sx.h> 52 #include <sys/syscallsubr.h> 53 #include <sys/sysctl.h> 54 #include <sys/sysproto.h> 55 #include <sys/vnode.h> 56 57 #ifdef DDB 58 #include <ddb/ddb.h> 59 #endif 60 61 #include <net/vnet.h> 62 63 #include <security/mac/mac_framework.h> 64 65 #include "linker_if.h" 66 67 #ifdef HWPMC_HOOKS 68 #include <sys/pmckern.h> 69 #endif 70 71 #ifdef KLD_DEBUG 72 int kld_debug = 0; 73 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RWTUN, 74 &kld_debug, 0, "Set various levels of KLD debug"); 75 #endif 76 77 /* These variables are used by kernel debuggers to enumerate loaded files. */ 78 const int kld_off_address = offsetof(struct linker_file, address); 79 const int kld_off_filename = offsetof(struct linker_file, filename); 80 const int kld_off_pathname = offsetof(struct linker_file, pathname); 81 const int kld_off_next = offsetof(struct linker_file, link.tqe_next); 82 83 /* 84 * static char *linker_search_path(const char *name, struct mod_depend 85 * *verinfo); 86 */ 87 static const char *linker_basename(const char *path); 88 89 /* 90 * Find a currently loaded file given its filename. 91 */ 92 static linker_file_t linker_find_file_by_name(const char* _filename); 93 94 /* 95 * Find a currently loaded file given its file id. 96 */ 97 static linker_file_t linker_find_file_by_id(int _fileid); 98 99 /* Metadata from the static kernel */ 100 SET_DECLARE(modmetadata_set, struct mod_metadata); 101 102 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 103 104 linker_file_t linker_kernel_file; 105 106 static struct sx kld_sx; /* kernel linker lock */ 107 static u_int kld_busy; 108 static struct thread *kld_busy_owner; 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 int last; 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 last = SI_SUB_DUMMY; 230 sx_xunlock(&kld_sx); 231 mtx_lock(&Giant); 232 for (sipp = start; sipp < stop; sipp++) { 233 if ((*sipp)->subsystem == SI_SUB_DUMMY) 234 continue; /* skip dummy task(s) */ 235 236 if ((*sipp)->subsystem > last) 237 BOOTTRACE("%s: sysinit 0x%7x", lf->filename, 238 (*sipp)->subsystem); 239 240 /* Call function */ 241 (*((*sipp)->func)) ((*sipp)->udata); 242 last = (*sipp)->subsystem; 243 } 244 mtx_unlock(&Giant); 245 sx_xlock(&kld_sx); 246 } 247 248 static void 249 linker_file_sysuninit(linker_file_t lf) 250 { 251 struct sysinit **start, **stop, **sipp, **xipp, *save; 252 int last; 253 254 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 255 lf->filename)); 256 257 sx_assert(&kld_sx, SA_XLOCKED); 258 259 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 260 NULL) != 0) 261 return; 262 263 /* 264 * Perform a reverse bubble sort of the system initialization objects 265 * by their subsystem (primary key) and order (secondary key). 266 * 267 * Since some things care about execution order, this is the operation 268 * which ensures continued function. 269 */ 270 for (sipp = start; sipp < stop; sipp++) { 271 for (xipp = sipp + 1; xipp < stop; xipp++) { 272 if ((*sipp)->subsystem > (*xipp)->subsystem || 273 ((*sipp)->subsystem == (*xipp)->subsystem && 274 (*sipp)->order >= (*xipp)->order)) 275 continue; /* skip */ 276 save = *sipp; 277 *sipp = *xipp; 278 *xipp = save; 279 } 280 } 281 282 /* 283 * Traverse the (now) ordered list of system initialization tasks. 284 * Perform each task, and continue on to the next task. 285 */ 286 sx_xunlock(&kld_sx); 287 mtx_lock(&Giant); 288 last = SI_SUB_DUMMY; 289 for (sipp = start; sipp < stop; sipp++) { 290 if ((*sipp)->subsystem == SI_SUB_DUMMY) 291 continue; /* skip dummy task(s) */ 292 293 if ((*sipp)->subsystem > last) 294 BOOTTRACE("%s: sysuninit 0x%7x", lf->filename, 295 (*sipp)->subsystem); 296 297 /* Call function */ 298 (*((*sipp)->func)) ((*sipp)->udata); 299 last = (*sipp)->subsystem; 300 } 301 mtx_unlock(&Giant); 302 sx_xlock(&kld_sx); 303 } 304 305 static void 306 linker_file_register_sysctls(linker_file_t lf, bool enable) 307 { 308 struct sysctl_oid **start, **stop, **oidp; 309 310 KLD_DPF(FILE, 311 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 312 lf->filename)); 313 314 sx_assert(&kld_sx, SA_XLOCKED); 315 316 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 317 return; 318 319 sx_xunlock(&kld_sx); 320 sysctl_wlock(); 321 for (oidp = start; oidp < stop; oidp++) { 322 if (enable) 323 sysctl_register_oid(*oidp); 324 else 325 sysctl_register_disabled_oid(*oidp); 326 } 327 sysctl_wunlock(); 328 sx_xlock(&kld_sx); 329 } 330 331 static void 332 linker_file_enable_sysctls(linker_file_t lf) 333 { 334 struct sysctl_oid **start, **stop, **oidp; 335 336 KLD_DPF(FILE, 337 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n", 338 lf->filename)); 339 340 sx_assert(&kld_sx, SA_XLOCKED); 341 342 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 343 return; 344 345 sx_xunlock(&kld_sx); 346 sysctl_wlock(); 347 for (oidp = start; oidp < stop; oidp++) 348 sysctl_enable_oid(*oidp); 349 sysctl_wunlock(); 350 sx_xlock(&kld_sx); 351 } 352 353 static void 354 linker_file_unregister_sysctls(linker_file_t lf) 355 { 356 struct sysctl_oid **start, **stop, **oidp; 357 358 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs" 359 " for %s\n", lf->filename)); 360 361 sx_assert(&kld_sx, SA_XLOCKED); 362 363 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 364 return; 365 366 sx_xunlock(&kld_sx); 367 sysctl_wlock(); 368 for (oidp = start; oidp < stop; oidp++) 369 sysctl_unregister_oid(*oidp); 370 sysctl_wunlock(); 371 sx_xlock(&kld_sx); 372 } 373 374 static int 375 linker_file_register_modules(linker_file_t lf) 376 { 377 struct mod_metadata **start, **stop, **mdp; 378 const moduledata_t *moddata; 379 int first_error, error; 380 381 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 382 " in %s\n", lf->filename)); 383 384 sx_assert(&kld_sx, SA_XLOCKED); 385 386 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL) != 0) { 387 /* 388 * This fallback should be unnecessary, but if we get booted 389 * from boot2 instead of loader and we are missing our 390 * metadata then we have to try the best we can. 391 */ 392 if (lf == linker_kernel_file) { 393 start = SET_BEGIN(modmetadata_set); 394 stop = SET_LIMIT(modmetadata_set); 395 } else 396 return (0); 397 } 398 first_error = 0; 399 for (mdp = start; mdp < stop; mdp++) { 400 if ((*mdp)->md_type != MDT_MODULE) 401 continue; 402 moddata = (*mdp)->md_data; 403 KLD_DPF(FILE, ("Registering module %s in %s\n", 404 moddata->name, lf->filename)); 405 error = module_register(moddata, lf); 406 if (error) { 407 printf("Module %s failed to register: %d\n", 408 moddata->name, error); 409 if (first_error == 0) 410 first_error = error; 411 } 412 } 413 return (first_error); 414 } 415 416 static void 417 linker_init_kernel_modules(void) 418 { 419 420 sx_xlock(&kld_sx); 421 linker_file_register_modules(linker_kernel_file); 422 sx_xunlock(&kld_sx); 423 } 424 425 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 426 NULL); 427 428 static int 429 linker_load_file(const char *filename, linker_file_t *result) 430 { 431 linker_class_t lc; 432 linker_file_t lf; 433 int foundfile, error, modules; 434 435 /* Refuse to load modules if securelevel raised */ 436 if (prison0.pr_securelevel > 0) 437 return (EPERM); 438 439 sx_assert(&kld_sx, SA_XLOCKED); 440 lf = linker_find_file_by_name(filename); 441 if (lf) { 442 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 443 " incrementing refs\n", filename)); 444 *result = lf; 445 lf->refs++; 446 return (0); 447 } 448 foundfile = 0; 449 error = 0; 450 451 /* 452 * We do not need to protect (lock) classes here because there is 453 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 454 * and there is no class deregistration mechanism at this time. 455 */ 456 TAILQ_FOREACH(lc, &classes, link) { 457 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 458 filename)); 459 error = LINKER_LOAD_FILE(lc, filename, &lf); 460 /* 461 * If we got something other than ENOENT, then it exists but 462 * we cannot load it for some other reason. 463 */ 464 if (error != ENOENT) { 465 foundfile = 1; 466 if (error == EEXIST) 467 break; 468 } 469 if (lf) { 470 error = linker_file_register_modules(lf); 471 if (error == EEXIST) { 472 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 473 return (error); 474 } 475 modules = !TAILQ_EMPTY(&lf->modules); 476 linker_file_register_sysctls(lf, false); 477 #ifdef VIMAGE 478 LINKER_PROPAGATE_VNETS(lf); 479 #endif 480 linker_file_sysinit(lf); 481 lf->flags |= LINKER_FILE_LINKED; 482 483 /* 484 * If all of the modules in this file failed 485 * to load, unload the file and return an 486 * error of ENOEXEC. 487 */ 488 if (modules && TAILQ_EMPTY(&lf->modules)) { 489 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 490 return (ENOEXEC); 491 } 492 linker_file_enable_sysctls(lf); 493 EVENTHANDLER_INVOKE(kld_load, lf); 494 *result = lf; 495 return (0); 496 } 497 } 498 /* 499 * Less than ideal, but tells the user whether it failed to load or 500 * the module was not found. 501 */ 502 if (foundfile) { 503 /* 504 * If the file type has not been recognized by the last try 505 * printout a message before to fail. 506 */ 507 if (error == ENOSYS) 508 printf("%s: %s - unsupported file type\n", 509 __func__, filename); 510 511 /* 512 * Format not recognized or otherwise unloadable. 513 * When loading a module that is statically built into 514 * the kernel EEXIST percolates back up as the return 515 * value. Preserve this so that apps like sysinstall 516 * can recognize this special case and not post bogus 517 * dialog boxes. 518 */ 519 if (error != EEXIST) 520 error = ENOEXEC; 521 } else 522 error = ENOENT; /* Nothing found */ 523 return (error); 524 } 525 526 int 527 linker_reference_module(const char *modname, struct mod_depend *verinfo, 528 linker_file_t *result) 529 { 530 modlist_t mod; 531 int error; 532 533 sx_xlock(&kld_sx); 534 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 535 *result = mod->container; 536 (*result)->refs++; 537 sx_xunlock(&kld_sx); 538 return (0); 539 } 540 541 error = linker_load_module(NULL, modname, NULL, verinfo, result); 542 sx_xunlock(&kld_sx); 543 return (error); 544 } 545 546 int 547 linker_release_module(const char *modname, struct mod_depend *verinfo, 548 linker_file_t lf) 549 { 550 modlist_t mod; 551 int error; 552 553 sx_xlock(&kld_sx); 554 if (lf == NULL) { 555 KASSERT(modname != NULL, 556 ("linker_release_module: no file or name")); 557 mod = modlist_lookup2(modname, verinfo); 558 if (mod == NULL) { 559 sx_xunlock(&kld_sx); 560 return (ESRCH); 561 } 562 lf = mod->container; 563 } else 564 KASSERT(modname == NULL && verinfo == NULL, 565 ("linker_release_module: both file and name")); 566 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL); 567 sx_xunlock(&kld_sx); 568 return (error); 569 } 570 571 static linker_file_t 572 linker_find_file_by_name(const char *filename) 573 { 574 linker_file_t lf; 575 char *koname; 576 577 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 578 sprintf(koname, "%s.ko", filename); 579 580 sx_assert(&kld_sx, SA_XLOCKED); 581 TAILQ_FOREACH(lf, &linker_files, link) { 582 if (strcmp(lf->filename, koname) == 0) 583 break; 584 if (strcmp(lf->filename, filename) == 0) 585 break; 586 } 587 free(koname, M_LINKER); 588 return (lf); 589 } 590 591 static linker_file_t 592 linker_find_file_by_id(int fileid) 593 { 594 linker_file_t lf; 595 596 sx_assert(&kld_sx, SA_XLOCKED); 597 TAILQ_FOREACH(lf, &linker_files, link) 598 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED) 599 break; 600 return (lf); 601 } 602 603 int 604 linker_file_foreach(linker_predicate_t *predicate, void *context) 605 { 606 linker_file_t lf; 607 int retval = 0; 608 609 sx_xlock(&kld_sx); 610 TAILQ_FOREACH(lf, &linker_files, link) { 611 retval = predicate(lf, context); 612 if (retval != 0) 613 break; 614 } 615 sx_xunlock(&kld_sx); 616 return (retval); 617 } 618 619 linker_file_t 620 linker_make_file(const char *pathname, linker_class_t lc) 621 { 622 linker_file_t lf; 623 const char *filename; 624 625 if (!cold) 626 sx_assert(&kld_sx, SA_XLOCKED); 627 filename = linker_basename(pathname); 628 629 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname)); 630 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 631 if (lf == NULL) 632 return (NULL); 633 lf->ctors_addr = 0; 634 lf->ctors_size = 0; 635 lf->dtors_addr = 0; 636 lf->dtors_size = 0; 637 lf->refs = 1; 638 lf->userrefs = 0; 639 lf->flags = 0; 640 lf->filename = strdup(filename, M_LINKER); 641 lf->pathname = strdup(pathname, M_LINKER); 642 LINKER_GET_NEXT_FILE_ID(lf->id); 643 lf->ndeps = 0; 644 lf->deps = NULL; 645 lf->loadcnt = ++loadcnt; 646 #ifdef __arm__ 647 lf->exidx_addr = 0; 648 lf->exidx_size = 0; 649 #endif 650 STAILQ_INIT(&lf->common); 651 TAILQ_INIT(&lf->modules); 652 TAILQ_INSERT_TAIL(&linker_files, lf, link); 653 return (lf); 654 } 655 656 int 657 linker_file_unload(linker_file_t file, int flags) 658 { 659 module_t mod, next; 660 modlist_t ml, nextml; 661 struct common_symbol *cp; 662 int error, i; 663 664 /* Refuse to unload modules if securelevel raised. */ 665 if (prison0.pr_securelevel > 0) 666 return (EPERM); 667 668 sx_assert(&kld_sx, SA_XLOCKED); 669 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 670 671 /* Easy case of just dropping a reference. */ 672 if (file->refs > 1) { 673 file->refs--; 674 return (0); 675 } 676 677 /* Give eventhandlers a chance to prevent the unload. */ 678 error = 0; 679 EVENTHANDLER_INVOKE(kld_unload_try, file, &error); 680 if (error != 0) 681 return (EBUSY); 682 683 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 684 " informing modules\n")); 685 686 /* 687 * Quiesce all the modules to give them a chance to veto the unload. 688 */ 689 MOD_SLOCK; 690 for (mod = TAILQ_FIRST(&file->modules); mod; 691 mod = module_getfnext(mod)) { 692 error = module_quiesce(mod); 693 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 694 KLD_DPF(FILE, ("linker_file_unload: module %s" 695 " vetoed unload\n", module_getname(mod))); 696 /* 697 * XXX: Do we need to tell all the quiesced modules 698 * that they can resume work now via a new module 699 * event? 700 */ 701 MOD_SUNLOCK; 702 return (error); 703 } 704 } 705 MOD_SUNLOCK; 706 707 /* 708 * Inform any modules associated with this file that they are 709 * being unloaded. 710 */ 711 MOD_XLOCK; 712 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 713 next = module_getfnext(mod); 714 MOD_XUNLOCK; 715 716 /* 717 * Give the module a chance to veto the unload. 718 */ 719 if ((error = module_unload(mod)) != 0) { 720 #ifdef KLD_DEBUG 721 MOD_SLOCK; 722 KLD_DPF(FILE, ("linker_file_unload: module %s" 723 " failed unload\n", module_getname(mod))); 724 MOD_SUNLOCK; 725 #endif 726 return (error); 727 } 728 MOD_XLOCK; 729 module_release(mod); 730 } 731 MOD_XUNLOCK; 732 733 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 734 if (ml->container == file) { 735 TAILQ_REMOVE(&found_modules, ml, link); 736 free(ml, M_LINKER); 737 } 738 } 739 740 /* 741 * Don't try to run SYSUNINITs if we are unloaded due to a 742 * link error. 743 */ 744 if (file->flags & LINKER_FILE_LINKED) { 745 file->flags &= ~LINKER_FILE_LINKED; 746 linker_file_unregister_sysctls(file); 747 linker_file_sysuninit(file); 748 } 749 TAILQ_REMOVE(&linker_files, file, link); 750 751 if (file->deps) { 752 for (i = 0; i < file->ndeps; i++) 753 linker_file_unload(file->deps[i], flags); 754 free(file->deps, M_LINKER); 755 file->deps = NULL; 756 } 757 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 758 STAILQ_REMOVE_HEAD(&file->common, link); 759 free(cp, M_LINKER); 760 } 761 762 LINKER_UNLOAD(file); 763 764 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address, 765 file->size); 766 767 if (file->filename) { 768 free(file->filename, M_LINKER); 769 file->filename = NULL; 770 } 771 if (file->pathname) { 772 free(file->pathname, M_LINKER); 773 file->pathname = NULL; 774 } 775 kobj_delete((kobj_t) file, M_LINKER); 776 return (0); 777 } 778 779 int 780 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 781 { 782 return (LINKER_CTF_GET(file, lc)); 783 } 784 785 static int 786 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 787 { 788 linker_file_t *newdeps; 789 790 sx_assert(&kld_sx, SA_XLOCKED); 791 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps), 792 M_LINKER, M_WAITOK | M_ZERO); 793 file->deps[file->ndeps] = dep; 794 file->ndeps++; 795 KLD_DPF(FILE, ("linker_file_add_dependency:" 796 " adding %s as dependency for %s\n", 797 dep->filename, file->filename)); 798 return (0); 799 } 800 801 /* 802 * Locate a linker set and its contents. This is a helper function to avoid 803 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 804 * This function is used in this file so we can avoid having lots of (void **) 805 * casts. 806 */ 807 int 808 linker_file_lookup_set(linker_file_t file, const char *name, 809 void *firstp, void *lastp, int *countp) 810 { 811 812 sx_assert(&kld_sx, SA_LOCKED); 813 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 814 } 815 816 /* 817 * List all functions in a file. 818 */ 819 int 820 linker_file_function_listall(linker_file_t lf, 821 linker_function_nameval_callback_t callback_func, void *arg) 822 { 823 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 824 } 825 826 caddr_t 827 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 828 { 829 caddr_t sym; 830 int locked; 831 832 locked = sx_xlocked(&kld_sx); 833 if (!locked) 834 sx_xlock(&kld_sx); 835 sym = linker_file_lookup_symbol_internal(file, name, deps); 836 if (!locked) 837 sx_xunlock(&kld_sx); 838 return (sym); 839 } 840 841 static caddr_t 842 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 843 int deps) 844 { 845 c_linker_sym_t sym; 846 linker_symval_t symval; 847 caddr_t address; 848 size_t common_size = 0; 849 int i; 850 851 sx_assert(&kld_sx, SA_XLOCKED); 852 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 853 file, name, deps)); 854 855 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 856 LINKER_SYMBOL_VALUES(file, sym, &symval); 857 if (symval.value == 0) 858 /* 859 * For commons, first look them up in the 860 * dependencies and only allocate space if not found 861 * there. 862 */ 863 common_size = symval.size; 864 else { 865 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 866 ".value=%p\n", symval.value)); 867 return (symval.value); 868 } 869 } 870 if (deps) { 871 for (i = 0; i < file->ndeps; i++) { 872 address = linker_file_lookup_symbol_internal( 873 file->deps[i], name, 0); 874 if (address) { 875 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 876 " deps value=%p\n", address)); 877 return (address); 878 } 879 } 880 } 881 if (common_size > 0) { 882 /* 883 * This is a common symbol which was not found in the 884 * dependencies. We maintain a simple common symbol table in 885 * the file object. 886 */ 887 struct common_symbol *cp; 888 889 STAILQ_FOREACH(cp, &file->common, link) { 890 if (strcmp(cp->name, name) == 0) { 891 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 892 " old common value=%p\n", cp->address)); 893 return (cp->address); 894 } 895 } 896 /* 897 * Round the symbol size up to align. 898 */ 899 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 900 cp = malloc(sizeof(struct common_symbol) 901 + common_size + strlen(name) + 1, M_LINKER, 902 M_WAITOK | M_ZERO); 903 cp->address = (caddr_t)(cp + 1); 904 cp->name = cp->address + common_size; 905 strcpy(cp->name, name); 906 bzero(cp->address, common_size); 907 STAILQ_INSERT_TAIL(&file->common, cp, link); 908 909 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 910 " value=%p\n", cp->address)); 911 return (cp->address); 912 } 913 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 914 return (0); 915 } 916 917 /* 918 * Both DDB and stack(9) rely on the kernel linker to provide forward and 919 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 920 * do this in a lockfree manner. We provide a set of internal helper 921 * routines to perform these operations without locks, and then wrappers that 922 * optionally lock. 923 * 924 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 925 */ 926 #ifdef DDB 927 static int 928 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 929 { 930 linker_file_t lf; 931 932 TAILQ_FOREACH(lf, &linker_files, link) { 933 if (LINKER_LOOKUP_DEBUG_SYMBOL(lf, symstr, sym) == 0) 934 return (0); 935 } 936 return (ENOENT); 937 } 938 #endif 939 940 static int 941 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 942 { 943 linker_file_t lf; 944 c_linker_sym_t best, es; 945 u_long diff, bestdiff, off; 946 947 best = 0; 948 off = (uintptr_t)value; 949 bestdiff = off; 950 TAILQ_FOREACH(lf, &linker_files, link) { 951 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 952 continue; 953 if (es != 0 && diff < bestdiff) { 954 best = es; 955 bestdiff = diff; 956 } 957 if (bestdiff == 0) 958 break; 959 } 960 if (best) { 961 *sym = best; 962 *diffp = bestdiff; 963 return (0); 964 } else { 965 *sym = 0; 966 *diffp = off; 967 return (ENOENT); 968 } 969 } 970 971 static int 972 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 973 { 974 linker_file_t lf; 975 976 TAILQ_FOREACH(lf, &linker_files, link) { 977 if (LINKER_DEBUG_SYMBOL_VALUES(lf, sym, symval) == 0) 978 return (0); 979 } 980 return (ENOENT); 981 } 982 983 static int 984 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 985 long *offset) 986 { 987 linker_symval_t symval; 988 c_linker_sym_t sym; 989 int error; 990 991 *offset = 0; 992 error = linker_debug_search_symbol(value, &sym, offset); 993 if (error) 994 return (error); 995 error = linker_debug_symbol_values(sym, &symval); 996 if (error) 997 return (error); 998 strlcpy(buf, symval.name, buflen); 999 return (0); 1000 } 1001 1002 /* 1003 * DDB Helpers. DDB has to look across multiple files with their own symbol 1004 * tables and string tables. 1005 * 1006 * Note that we do not obey list locking protocols here. We really don't need 1007 * DDB to hang because somebody's got the lock held. We'll take the chance 1008 * that the files list is inconsistent instead. 1009 */ 1010 #ifdef DDB 1011 int 1012 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 1013 { 1014 1015 return (linker_debug_lookup(symstr, sym)); 1016 } 1017 #endif 1018 1019 int 1020 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 1021 { 1022 1023 return (linker_debug_search_symbol(value, sym, diffp)); 1024 } 1025 1026 int 1027 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 1028 { 1029 1030 return (linker_debug_symbol_values(sym, symval)); 1031 } 1032 1033 int 1034 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1035 long *offset) 1036 { 1037 1038 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 1039 } 1040 1041 /* 1042 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 1043 * obey locking protocols, and offer a significantly less complex interface. 1044 */ 1045 int 1046 linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen, 1047 long *offset, int flags) 1048 { 1049 int error; 1050 1051 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 && 1052 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK), 1053 ("%s: bad flags: 0x%x", __func__, flags)); 1054 1055 if (flags & M_NOWAIT) { 1056 if (!sx_try_slock(&kld_sx)) 1057 return (EWOULDBLOCK); 1058 } else 1059 sx_slock(&kld_sx); 1060 1061 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 1062 sx_sunlock(&kld_sx); 1063 return (error); 1064 } 1065 1066 int 1067 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 1068 long *offset) 1069 { 1070 1071 return (linker_search_symbol_name_flags(value, buf, buflen, offset, 1072 M_WAITOK)); 1073 } 1074 1075 int 1076 linker_kldload_busy(int flags) 1077 { 1078 int error; 1079 1080 MPASS((flags & ~(LINKER_UB_UNLOCK | LINKER_UB_LOCKED | 1081 LINKER_UB_PCATCH)) == 0); 1082 if ((flags & LINKER_UB_LOCKED) != 0) 1083 sx_assert(&kld_sx, SA_XLOCKED); 1084 1085 if ((flags & LINKER_UB_LOCKED) == 0) 1086 sx_xlock(&kld_sx); 1087 while (kld_busy > 0) { 1088 if (kld_busy_owner == curthread) 1089 break; 1090 error = sx_sleep(&kld_busy, &kld_sx, 1091 (flags & LINKER_UB_PCATCH) != 0 ? PCATCH : 0, 1092 "kldbusy", 0); 1093 if (error != 0) { 1094 if ((flags & LINKER_UB_UNLOCK) != 0) 1095 sx_xunlock(&kld_sx); 1096 return (error); 1097 } 1098 } 1099 kld_busy++; 1100 kld_busy_owner = curthread; 1101 if ((flags & LINKER_UB_UNLOCK) != 0) 1102 sx_xunlock(&kld_sx); 1103 return (0); 1104 } 1105 1106 void 1107 linker_kldload_unbusy(int flags) 1108 { 1109 MPASS((flags & ~LINKER_UB_LOCKED) == 0); 1110 if ((flags & LINKER_UB_LOCKED) != 0) 1111 sx_assert(&kld_sx, SA_XLOCKED); 1112 1113 if ((flags & LINKER_UB_LOCKED) == 0) 1114 sx_xlock(&kld_sx); 1115 MPASS(kld_busy > 0); 1116 if (kld_busy_owner != curthread) 1117 panic("linker_kldload_unbusy done by not owning thread %p", 1118 kld_busy_owner); 1119 kld_busy--; 1120 if (kld_busy == 0) { 1121 kld_busy_owner = NULL; 1122 wakeup(&kld_busy); 1123 } 1124 sx_xunlock(&kld_sx); 1125 } 1126 1127 /* 1128 * Syscalls. 1129 */ 1130 int 1131 kern_kldload(struct thread *td, const char *file, int *fileid) 1132 { 1133 const char *kldname, *modname; 1134 linker_file_t lf; 1135 int error; 1136 1137 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1138 return (error); 1139 1140 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1141 return (error); 1142 1143 /* 1144 * If file does not contain a qualified name or any dot in it 1145 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1146 * name. 1147 */ 1148 if (strchr(file, '/') || strchr(file, '.')) { 1149 kldname = file; 1150 modname = NULL; 1151 } else { 1152 kldname = NULL; 1153 modname = file; 1154 } 1155 1156 error = linker_kldload_busy(LINKER_UB_PCATCH); 1157 if (error != 0) { 1158 sx_xunlock(&kld_sx); 1159 return (error); 1160 } 1161 1162 /* 1163 * It is possible that kldloaded module will attach a new ifnet, 1164 * so vnet context must be set when this ocurs. 1165 */ 1166 CURVNET_SET(TD_TO_VNET(td)); 1167 1168 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1169 CURVNET_RESTORE(); 1170 1171 if (error == 0) { 1172 lf->userrefs++; 1173 if (fileid != NULL) 1174 *fileid = lf->id; 1175 } 1176 linker_kldload_unbusy(LINKER_UB_LOCKED); 1177 return (error); 1178 } 1179 1180 int 1181 sys_kldload(struct thread *td, struct kldload_args *uap) 1182 { 1183 char *pathname = NULL; 1184 int error, fileid; 1185 1186 td->td_retval[0] = -1; 1187 1188 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1189 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1190 if (error == 0) { 1191 error = kern_kldload(td, pathname, &fileid); 1192 if (error == 0) 1193 td->td_retval[0] = fileid; 1194 } 1195 free(pathname, M_TEMP); 1196 return (error); 1197 } 1198 1199 int 1200 kern_kldunload(struct thread *td, int fileid, int flags) 1201 { 1202 linker_file_t lf; 1203 int error = 0; 1204 1205 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1206 return (error); 1207 1208 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1209 return (error); 1210 1211 error = linker_kldload_busy(LINKER_UB_PCATCH); 1212 if (error != 0) { 1213 sx_xunlock(&kld_sx); 1214 return (error); 1215 } 1216 1217 CURVNET_SET(TD_TO_VNET(td)); 1218 lf = linker_find_file_by_id(fileid); 1219 if (lf) { 1220 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1221 1222 if (lf->userrefs == 0) { 1223 /* 1224 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1225 */ 1226 printf("kldunload: attempt to unload file that was" 1227 " loaded by the kernel\n"); 1228 error = EBUSY; 1229 } else { 1230 lf->userrefs--; 1231 error = linker_file_unload(lf, flags); 1232 if (error) 1233 lf->userrefs++; 1234 } 1235 } else 1236 error = ENOENT; 1237 CURVNET_RESTORE(); 1238 linker_kldload_unbusy(LINKER_UB_LOCKED); 1239 return (error); 1240 } 1241 1242 int 1243 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1244 { 1245 1246 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1247 } 1248 1249 int 1250 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1251 { 1252 1253 if (uap->flags != LINKER_UNLOAD_NORMAL && 1254 uap->flags != LINKER_UNLOAD_FORCE) 1255 return (EINVAL); 1256 return (kern_kldunload(td, uap->fileid, uap->flags)); 1257 } 1258 1259 int 1260 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1261 { 1262 char *pathname; 1263 const char *filename; 1264 linker_file_t lf; 1265 int error; 1266 1267 #ifdef MAC 1268 error = mac_kld_check_stat(td->td_ucred); 1269 if (error) 1270 return (error); 1271 #endif 1272 1273 td->td_retval[0] = -1; 1274 1275 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1276 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1277 goto out; 1278 1279 filename = linker_basename(pathname); 1280 sx_xlock(&kld_sx); 1281 lf = linker_find_file_by_name(filename); 1282 if (lf) 1283 td->td_retval[0] = lf->id; 1284 else 1285 error = ENOENT; 1286 sx_xunlock(&kld_sx); 1287 out: 1288 free(pathname, M_TEMP); 1289 return (error); 1290 } 1291 1292 int 1293 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1294 { 1295 linker_file_t lf; 1296 int error = 0; 1297 1298 #ifdef MAC 1299 error = mac_kld_check_stat(td->td_ucred); 1300 if (error) 1301 return (error); 1302 #endif 1303 1304 sx_xlock(&kld_sx); 1305 if (uap->fileid == 0) 1306 lf = TAILQ_FIRST(&linker_files); 1307 else { 1308 lf = linker_find_file_by_id(uap->fileid); 1309 if (lf == NULL) { 1310 error = ENOENT; 1311 goto out; 1312 } 1313 lf = TAILQ_NEXT(lf, link); 1314 } 1315 1316 /* Skip partially loaded files. */ 1317 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1318 lf = TAILQ_NEXT(lf, link); 1319 1320 if (lf) 1321 td->td_retval[0] = lf->id; 1322 else 1323 td->td_retval[0] = 0; 1324 out: 1325 sx_xunlock(&kld_sx); 1326 return (error); 1327 } 1328 1329 int 1330 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1331 { 1332 struct kld_file_stat *stat; 1333 int error, version; 1334 1335 /* 1336 * Check the version of the user's structure. 1337 */ 1338 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1339 != 0) 1340 return (error); 1341 if (version != sizeof(struct kld_file_stat_1) && 1342 version != sizeof(struct kld_file_stat)) 1343 return (EINVAL); 1344 1345 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO); 1346 error = kern_kldstat(td, uap->fileid, stat); 1347 if (error == 0) 1348 error = copyout(stat, uap->stat, version); 1349 free(stat, M_TEMP); 1350 return (error); 1351 } 1352 1353 int 1354 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat) 1355 { 1356 linker_file_t lf; 1357 int namelen; 1358 #ifdef MAC 1359 int error; 1360 1361 error = mac_kld_check_stat(td->td_ucred); 1362 if (error) 1363 return (error); 1364 #endif 1365 1366 sx_xlock(&kld_sx); 1367 lf = linker_find_file_by_id(fileid); 1368 if (lf == NULL) { 1369 sx_xunlock(&kld_sx); 1370 return (ENOENT); 1371 } 1372 1373 /* Version 1 fields: */ 1374 namelen = strlen(lf->filename) + 1; 1375 if (namelen > sizeof(stat->name)) 1376 namelen = sizeof(stat->name); 1377 bcopy(lf->filename, &stat->name[0], namelen); 1378 stat->refs = lf->refs; 1379 stat->id = lf->id; 1380 stat->address = lf->address; 1381 stat->size = lf->size; 1382 /* Version 2 fields: */ 1383 namelen = strlen(lf->pathname) + 1; 1384 if (namelen > sizeof(stat->pathname)) 1385 namelen = sizeof(stat->pathname); 1386 bcopy(lf->pathname, &stat->pathname[0], namelen); 1387 sx_xunlock(&kld_sx); 1388 1389 td->td_retval[0] = 0; 1390 return (0); 1391 } 1392 1393 #ifdef DDB 1394 DB_COMMAND_FLAGS(kldstat, db_kldstat, DB_CMD_MEMSAFE) 1395 { 1396 linker_file_t lf; 1397 1398 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2)) 1399 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' '); 1400 #undef POINTER_WIDTH 1401 TAILQ_FOREACH(lf, &linker_files, link) { 1402 if (db_pager_quit) 1403 return; 1404 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs, 1405 lf->address, lf->size, lf->filename); 1406 } 1407 } 1408 #endif /* DDB */ 1409 1410 int 1411 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1412 { 1413 linker_file_t lf; 1414 module_t mp; 1415 int error = 0; 1416 1417 #ifdef MAC 1418 error = mac_kld_check_stat(td->td_ucred); 1419 if (error) 1420 return (error); 1421 #endif 1422 1423 sx_xlock(&kld_sx); 1424 lf = linker_find_file_by_id(uap->fileid); 1425 if (lf) { 1426 MOD_SLOCK; 1427 mp = TAILQ_FIRST(&lf->modules); 1428 if (mp != NULL) 1429 td->td_retval[0] = module_getid(mp); 1430 else 1431 td->td_retval[0] = 0; 1432 MOD_SUNLOCK; 1433 } else 1434 error = ENOENT; 1435 sx_xunlock(&kld_sx); 1436 return (error); 1437 } 1438 1439 int 1440 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1441 { 1442 char *symstr = NULL; 1443 c_linker_sym_t sym; 1444 linker_symval_t symval; 1445 linker_file_t lf; 1446 struct kld_sym_lookup lookup; 1447 int error = 0; 1448 1449 #ifdef MAC 1450 error = mac_kld_check_stat(td->td_ucred); 1451 if (error) 1452 return (error); 1453 #endif 1454 1455 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1456 return (error); 1457 if (lookup.version != sizeof(lookup) || 1458 uap->cmd != KLDSYM_LOOKUP) 1459 return (EINVAL); 1460 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1461 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1462 goto out; 1463 sx_xlock(&kld_sx); 1464 if (uap->fileid != 0) { 1465 lf = linker_find_file_by_id(uap->fileid); 1466 if (lf == NULL) 1467 error = ENOENT; 1468 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1469 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1470 lookup.symvalue = (uintptr_t) symval.value; 1471 lookup.symsize = symval.size; 1472 error = copyout(&lookup, uap->data, sizeof(lookup)); 1473 } else 1474 error = ENOENT; 1475 } else { 1476 TAILQ_FOREACH(lf, &linker_files, link) { 1477 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1478 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1479 lookup.symvalue = (uintptr_t)symval.value; 1480 lookup.symsize = symval.size; 1481 error = copyout(&lookup, uap->data, 1482 sizeof(lookup)); 1483 break; 1484 } 1485 } 1486 if (lf == NULL) 1487 error = ENOENT; 1488 } 1489 sx_xunlock(&kld_sx); 1490 out: 1491 free(symstr, M_TEMP); 1492 return (error); 1493 } 1494 1495 /* 1496 * Preloaded module support 1497 */ 1498 1499 static modlist_t 1500 modlist_lookup(const char *name, int ver) 1501 { 1502 modlist_t mod; 1503 1504 TAILQ_FOREACH(mod, &found_modules, link) { 1505 if (strcmp(mod->name, name) == 0 && 1506 (ver == 0 || mod->version == ver)) 1507 return (mod); 1508 } 1509 return (NULL); 1510 } 1511 1512 static modlist_t 1513 modlist_lookup2(const char *name, const struct mod_depend *verinfo) 1514 { 1515 modlist_t mod, bestmod; 1516 int ver; 1517 1518 if (verinfo == NULL) 1519 return (modlist_lookup(name, 0)); 1520 bestmod = NULL; 1521 TAILQ_FOREACH(mod, &found_modules, link) { 1522 if (strcmp(mod->name, name) != 0) 1523 continue; 1524 ver = mod->version; 1525 if (ver == verinfo->md_ver_preferred) 1526 return (mod); 1527 if (ver >= verinfo->md_ver_minimum && 1528 ver <= verinfo->md_ver_maximum && 1529 (bestmod == NULL || ver > bestmod->version)) 1530 bestmod = mod; 1531 } 1532 return (bestmod); 1533 } 1534 1535 static modlist_t 1536 modlist_newmodule(const char *modname, int version, linker_file_t container) 1537 { 1538 modlist_t mod; 1539 1540 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1541 if (mod == NULL) 1542 panic("no memory for module list"); 1543 mod->container = container; 1544 mod->name = modname; 1545 mod->version = version; 1546 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1547 return (mod); 1548 } 1549 1550 static void 1551 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1552 struct mod_metadata **stop, int preload) 1553 { 1554 struct mod_metadata *mp, **mdp; 1555 const char *modname; 1556 int ver; 1557 1558 for (mdp = start; mdp < stop; mdp++) { 1559 mp = *mdp; 1560 if (mp->md_type != MDT_VERSION) 1561 continue; 1562 modname = mp->md_cval; 1563 ver = ((const struct mod_version *)mp->md_data)->mv_version; 1564 if (modlist_lookup(modname, ver) != NULL) { 1565 printf("module %s already present!\n", modname); 1566 /* XXX what can we do? this is a build error. :-( */ 1567 continue; 1568 } 1569 modlist_newmodule(modname, ver, lf); 1570 } 1571 } 1572 1573 static void 1574 linker_preload(void *arg) 1575 { 1576 caddr_t modptr; 1577 const char *modname, *nmodname; 1578 char *modtype; 1579 linker_file_t lf, nlf; 1580 linker_class_t lc; 1581 int error; 1582 linker_file_list_t loaded_files; 1583 linker_file_list_t depended_files; 1584 struct mod_metadata *mp, *nmp; 1585 struct mod_metadata **start, **stop, **mdp, **nmdp; 1586 const struct mod_depend *verinfo; 1587 int nver; 1588 int resolves; 1589 modlist_t mod; 1590 struct sysinit **si_start, **si_stop; 1591 1592 TAILQ_INIT(&loaded_files); 1593 TAILQ_INIT(&depended_files); 1594 TAILQ_INIT(&found_modules); 1595 error = 0; 1596 1597 modptr = NULL; 1598 sx_xlock(&kld_sx); 1599 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1600 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1601 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1602 if (modname == NULL) { 1603 printf("Preloaded module at %p does not have a" 1604 " name!\n", modptr); 1605 continue; 1606 } 1607 if (modtype == NULL) { 1608 printf("Preloaded module at %p does not have a type!\n", 1609 modptr); 1610 continue; 1611 } 1612 if (bootverbose) 1613 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1614 modptr); 1615 lf = NULL; 1616 TAILQ_FOREACH(lc, &classes, link) { 1617 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1618 if (!error) 1619 break; 1620 lf = NULL; 1621 } 1622 if (lf) 1623 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1624 } 1625 1626 /* 1627 * First get a list of stuff in the kernel. 1628 */ 1629 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1630 &stop, NULL) == 0) 1631 linker_addmodules(linker_kernel_file, start, stop, 1); 1632 1633 /* 1634 * This is a once-off kinky bubble sort to resolve relocation 1635 * dependency requirements. 1636 */ 1637 restart: 1638 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1639 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1640 &stop, NULL); 1641 /* 1642 * First, look to see if we would successfully link with this 1643 * stuff. 1644 */ 1645 resolves = 1; /* unless we know otherwise */ 1646 if (!error) { 1647 for (mdp = start; mdp < stop; mdp++) { 1648 mp = *mdp; 1649 if (mp->md_type != MDT_DEPEND) 1650 continue; 1651 modname = mp->md_cval; 1652 verinfo = mp->md_data; 1653 for (nmdp = start; nmdp < stop; nmdp++) { 1654 nmp = *nmdp; 1655 if (nmp->md_type != MDT_VERSION) 1656 continue; 1657 nmodname = nmp->md_cval; 1658 if (strcmp(modname, nmodname) == 0) 1659 break; 1660 } 1661 if (nmdp < stop) /* it's a self reference */ 1662 continue; 1663 1664 /* 1665 * ok, the module isn't here yet, we 1666 * are not finished 1667 */ 1668 if (modlist_lookup2(modname, verinfo) == NULL) 1669 resolves = 0; 1670 } 1671 } 1672 /* 1673 * OK, if we found our modules, we can link. So, "provide" 1674 * the modules inside and add it to the end of the link order 1675 * list. 1676 */ 1677 if (resolves) { 1678 if (!error) { 1679 for (mdp = start; mdp < stop; mdp++) { 1680 mp = *mdp; 1681 if (mp->md_type != MDT_VERSION) 1682 continue; 1683 modname = mp->md_cval; 1684 nver = ((const struct mod_version *) 1685 mp->md_data)->mv_version; 1686 if (modlist_lookup(modname, 1687 nver) != NULL) { 1688 printf("module %s already" 1689 " present!\n", modname); 1690 TAILQ_REMOVE(&loaded_files, 1691 lf, loaded); 1692 linker_file_unload(lf, 1693 LINKER_UNLOAD_FORCE); 1694 /* we changed tailq next ptr */ 1695 goto restart; 1696 } 1697 modlist_newmodule(modname, nver, lf); 1698 } 1699 } 1700 TAILQ_REMOVE(&loaded_files, lf, loaded); 1701 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1702 /* 1703 * Since we provided modules, we need to restart the 1704 * sort so that the previous files that depend on us 1705 * have a chance. Also, we've busted the tailq next 1706 * pointer with the REMOVE. 1707 */ 1708 goto restart; 1709 } 1710 } 1711 1712 /* 1713 * At this point, we check to see what could not be resolved.. 1714 */ 1715 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1716 TAILQ_REMOVE(&loaded_files, lf, loaded); 1717 printf("KLD file %s is missing dependencies\n", lf->filename); 1718 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1719 } 1720 1721 /* 1722 * We made it. Finish off the linking in the order we determined. 1723 */ 1724 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1725 if (linker_kernel_file) { 1726 linker_kernel_file->refs++; 1727 error = linker_file_add_dependency(lf, 1728 linker_kernel_file); 1729 if (error) 1730 panic("cannot add dependency"); 1731 } 1732 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1733 &stop, NULL); 1734 if (!error) { 1735 for (mdp = start; mdp < stop; mdp++) { 1736 mp = *mdp; 1737 if (mp->md_type != MDT_DEPEND) 1738 continue; 1739 modname = mp->md_cval; 1740 verinfo = mp->md_data; 1741 mod = modlist_lookup2(modname, verinfo); 1742 if (mod == NULL) { 1743 printf("KLD file %s - cannot find " 1744 "dependency \"%s\"\n", 1745 lf->filename, modname); 1746 goto fail; 1747 } 1748 /* Don't count self-dependencies */ 1749 if (lf == mod->container) 1750 continue; 1751 mod->container->refs++; 1752 error = linker_file_add_dependency(lf, 1753 mod->container); 1754 if (error) 1755 panic("cannot add dependency"); 1756 } 1757 } 1758 /* 1759 * Now do relocation etc using the symbol search paths 1760 * established by the dependencies 1761 */ 1762 error = LINKER_LINK_PRELOAD_FINISH(lf); 1763 if (error) { 1764 printf("KLD file %s - could not finalize loading\n", 1765 lf->filename); 1766 goto fail; 1767 } 1768 linker_file_register_modules(lf); 1769 if (!TAILQ_EMPTY(&lf->modules)) 1770 lf->flags |= LINKER_FILE_MODULES; 1771 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1772 &si_stop, NULL) == 0) 1773 sysinit_add(si_start, si_stop); 1774 linker_file_register_sysctls(lf, true); 1775 lf->flags |= LINKER_FILE_LINKED; 1776 continue; 1777 fail: 1778 TAILQ_REMOVE(&depended_files, lf, loaded); 1779 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1780 } 1781 sx_xunlock(&kld_sx); 1782 /* woohoo! we made it! */ 1783 } 1784 1785 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL); 1786 1787 /* 1788 * Handle preload files that failed to load any modules. 1789 */ 1790 static void 1791 linker_preload_finish(void *arg) 1792 { 1793 linker_file_t lf, nlf; 1794 1795 sx_xlock(&kld_sx); 1796 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) { 1797 /* 1798 * If all of the modules in this file failed to load, unload 1799 * the file and return an error of ENOEXEC. (Parity with 1800 * linker_load_file.) 1801 */ 1802 if ((lf->flags & LINKER_FILE_MODULES) != 0 && 1803 TAILQ_EMPTY(&lf->modules)) { 1804 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1805 continue; 1806 } 1807 1808 lf->flags &= ~LINKER_FILE_MODULES; 1809 lf->userrefs++; /* so we can (try to) kldunload it */ 1810 } 1811 sx_xunlock(&kld_sx); 1812 } 1813 1814 /* 1815 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be 1816 * scheduled at any subsystem and order, so run this as late as possible. init 1817 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that. 1818 */ 1819 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE, 1820 linker_preload_finish, NULL); 1821 1822 /* 1823 * Search for a not-loaded module by name. 1824 * 1825 * Modules may be found in the following locations: 1826 * 1827 * - preloaded (result is just the module name) - on disk (result is full path 1828 * to module) 1829 * 1830 * If the module name is qualified in any way (contains path, etc.) the we 1831 * simply return a copy of it. 1832 * 1833 * The search path can be manipulated via sysctl. Note that we use the ';' 1834 * character as a separator to be consistent with the bootloader. 1835 */ 1836 1837 static char linker_hintfile[] = "linker.hints"; 1838 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1839 1840 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path, 1841 sizeof(linker_path), "module load search path"); 1842 1843 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1844 1845 static const char * const linker_ext_list[] = { 1846 "", 1847 ".ko", 1848 NULL 1849 }; 1850 1851 /* 1852 * Check if file actually exists either with or without extension listed in 1853 * the linker_ext_list. (probably should be generic for the rest of the 1854 * kernel) 1855 */ 1856 static char * 1857 linker_lookup_file(const char *path, int pathlen, const char *name, 1858 int namelen, struct vattr *vap) 1859 { 1860 struct nameidata nd; 1861 struct thread *td = curthread; /* XXX */ 1862 const char * const *cpp, *sep; 1863 char *result; 1864 int error, len, extlen, reclen, flags; 1865 __enum_uint8(vtype) type; 1866 1867 extlen = 0; 1868 for (cpp = linker_ext_list; *cpp; cpp++) { 1869 len = strlen(*cpp); 1870 if (len > extlen) 1871 extlen = len; 1872 } 1873 extlen++; /* trailing '\0' */ 1874 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1875 1876 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1877 result = malloc(reclen, M_LINKER, M_WAITOK); 1878 for (cpp = linker_ext_list; *cpp; cpp++) { 1879 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1880 namelen, name, *cpp); 1881 /* 1882 * Attempt to open the file, and return the path if 1883 * we succeed and it's a regular file. 1884 */ 1885 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result); 1886 flags = FREAD; 1887 error = vn_open(&nd, &flags, 0, NULL); 1888 if (error == 0) { 1889 NDFREE_PNBUF(&nd); 1890 type = nd.ni_vp->v_type; 1891 if (vap) 1892 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1893 VOP_UNLOCK(nd.ni_vp); 1894 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1895 if (type == VREG) 1896 return (result); 1897 } 1898 } 1899 free(result, M_LINKER); 1900 return (NULL); 1901 } 1902 1903 #define INT_ALIGN(base, ptr) ptr = \ 1904 (base) + roundup2((ptr) - (base), sizeof(int)) 1905 1906 /* 1907 * Lookup KLD which contains requested module in the "linker.hints" file. If 1908 * version specification is available, then try to find the best KLD. 1909 * Otherwise just find the latest one. 1910 */ 1911 static char * 1912 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1913 int modnamelen, const struct mod_depend *verinfo) 1914 { 1915 struct thread *td = curthread; /* XXX */ 1916 struct ucred *cred = td ? td->td_ucred : NULL; 1917 struct nameidata nd; 1918 struct vattr vattr, mattr; 1919 const char *best, *sep; 1920 u_char *hints = NULL; 1921 u_char *cp, *recptr, *bufend, *result, *pathbuf; 1922 int error, ival, bestver, *intp, found, flags, clen, blen; 1923 ssize_t reclen; 1924 1925 result = NULL; 1926 bestver = found = 0; 1927 1928 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1929 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1930 strlen(sep) + 1; 1931 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1932 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1933 linker_hintfile); 1934 1935 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf); 1936 flags = FREAD; 1937 error = vn_open(&nd, &flags, 0, NULL); 1938 if (error) 1939 goto bad; 1940 NDFREE_PNBUF(&nd); 1941 if (nd.ni_vp->v_type != VREG) 1942 goto bad; 1943 best = cp = NULL; 1944 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1945 if (error) 1946 goto bad; 1947 /* 1948 * XXX: we need to limit this number to some reasonable value 1949 */ 1950 if (vattr.va_size > LINKER_HINTS_MAX) { 1951 printf("linker.hints file too large %ld\n", (long)vattr.va_size); 1952 goto bad; 1953 } 1954 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1955 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1956 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1957 if (error) 1958 goto bad; 1959 VOP_UNLOCK(nd.ni_vp); 1960 vn_close(nd.ni_vp, FREAD, cred, td); 1961 nd.ni_vp = NULL; 1962 if (reclen != 0) { 1963 printf("can't read %zd\n", reclen); 1964 goto bad; 1965 } 1966 intp = (int *)hints; 1967 ival = *intp++; 1968 if (ival != LINKER_HINTS_VERSION) { 1969 printf("linker.hints file version mismatch %d\n", ival); 1970 goto bad; 1971 } 1972 bufend = hints + vattr.va_size; 1973 recptr = (u_char *)intp; 1974 clen = blen = 0; 1975 while (recptr < bufend && !found) { 1976 intp = (int *)recptr; 1977 reclen = *intp++; 1978 ival = *intp++; 1979 cp = (char *)intp; 1980 switch (ival) { 1981 case MDT_VERSION: 1982 clen = *cp++; 1983 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1984 break; 1985 cp += clen; 1986 INT_ALIGN(hints, cp); 1987 ival = *(int *)cp; 1988 cp += sizeof(int); 1989 clen = *cp++; 1990 if (verinfo == NULL || 1991 ival == verinfo->md_ver_preferred) { 1992 found = 1; 1993 break; 1994 } 1995 if (ival >= verinfo->md_ver_minimum && 1996 ival <= verinfo->md_ver_maximum && 1997 ival > bestver) { 1998 bestver = ival; 1999 best = cp; 2000 blen = clen; 2001 } 2002 break; 2003 default: 2004 break; 2005 } 2006 recptr += reclen + sizeof(int); 2007 } 2008 /* 2009 * Finally check if KLD is in the place 2010 */ 2011 if (found) 2012 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 2013 else if (best) 2014 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 2015 2016 /* 2017 * KLD is newer than hints file. What we should do now? 2018 */ 2019 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 2020 printf("warning: KLD '%s' is newer than the linker.hints" 2021 " file\n", result); 2022 bad: 2023 free(pathbuf, M_LINKER); 2024 if (hints) 2025 free(hints, M_TEMP); 2026 if (nd.ni_vp != NULL) { 2027 VOP_UNLOCK(nd.ni_vp); 2028 vn_close(nd.ni_vp, FREAD, cred, td); 2029 } 2030 /* 2031 * If nothing found or hints is absent - fallback to the old 2032 * way by using "kldname[.ko]" as module name. 2033 */ 2034 if (!found && !bestver && result == NULL) 2035 result = linker_lookup_file(path, pathlen, modname, 2036 modnamelen, NULL); 2037 return (result); 2038 } 2039 2040 /* 2041 * Lookup KLD which contains requested module in the all directories. 2042 */ 2043 static char * 2044 linker_search_module(const char *modname, int modnamelen, 2045 const struct mod_depend *verinfo) 2046 { 2047 char *cp, *ep, *result; 2048 2049 /* 2050 * traverse the linker path 2051 */ 2052 for (cp = linker_path; *cp; cp = ep + 1) { 2053 /* find the end of this component */ 2054 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 2055 result = linker_hints_lookup(cp, ep - cp, modname, 2056 modnamelen, verinfo); 2057 if (result != NULL) 2058 return (result); 2059 if (*ep == 0) 2060 break; 2061 } 2062 return (NULL); 2063 } 2064 2065 /* 2066 * Search for module in all directories listed in the linker_path. 2067 */ 2068 static char * 2069 linker_search_kld(const char *name) 2070 { 2071 char *cp, *ep, *result; 2072 int len; 2073 2074 /* qualified at all? */ 2075 if (strchr(name, '/')) 2076 return (strdup(name, M_LINKER)); 2077 2078 /* traverse the linker path */ 2079 len = strlen(name); 2080 for (ep = linker_path; *ep; ep++) { 2081 cp = ep; 2082 /* find the end of this component */ 2083 for (; *ep != 0 && *ep != ';'; ep++); 2084 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 2085 if (result != NULL) 2086 return (result); 2087 } 2088 return (NULL); 2089 } 2090 2091 static const char * 2092 linker_basename(const char *path) 2093 { 2094 const char *filename; 2095 2096 filename = strrchr(path, '/'); 2097 if (filename == NULL) 2098 return path; 2099 if (filename[1]) 2100 filename++; 2101 return (filename); 2102 } 2103 2104 #ifdef HWPMC_HOOKS 2105 /* 2106 * Inform hwpmc about the set of kernel modules currently loaded. 2107 */ 2108 void * 2109 linker_hwpmc_list_objects(void) 2110 { 2111 linker_file_t lf; 2112 struct pmckern_map_in *kobase; 2113 int i, nmappings; 2114 2115 nmappings = 0; 2116 sx_slock(&kld_sx); 2117 TAILQ_FOREACH(lf, &linker_files, link) 2118 nmappings++; 2119 2120 /* Allocate nmappings + 1 entries. */ 2121 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 2122 M_LINKER, M_WAITOK | M_ZERO); 2123 i = 0; 2124 TAILQ_FOREACH(lf, &linker_files, link) { 2125 /* Save the info for this linker file. */ 2126 kobase[i].pm_file = lf->pathname; 2127 kobase[i].pm_address = (uintptr_t)lf->address; 2128 i++; 2129 } 2130 sx_sunlock(&kld_sx); 2131 2132 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 2133 2134 /* The last entry of the malloced area comprises of all zeros. */ 2135 KASSERT(kobase[i].pm_file == NULL, 2136 ("linker_hwpmc_list_objects: last object not NULL")); 2137 2138 return ((void *)kobase); 2139 } 2140 #endif 2141 2142 /* check if root file system is not mounted */ 2143 static bool 2144 linker_root_mounted(void) 2145 { 2146 struct pwd *pwd; 2147 bool ret; 2148 2149 if (rootvnode == NULL) 2150 return (false); 2151 2152 pwd = pwd_hold(curthread); 2153 ret = pwd->pwd_rdir != NULL; 2154 pwd_drop(pwd); 2155 return (ret); 2156 } 2157 2158 /* 2159 * Find a file which contains given module and load it, if "parent" is not 2160 * NULL, register a reference to it. 2161 */ 2162 static int 2163 linker_load_module(const char *kldname, const char *modname, 2164 struct linker_file *parent, const struct mod_depend *verinfo, 2165 struct linker_file **lfpp) 2166 { 2167 linker_file_t lfdep; 2168 const char *filename; 2169 char *pathname; 2170 int error; 2171 2172 sx_assert(&kld_sx, SA_XLOCKED); 2173 if (modname == NULL) { 2174 /* 2175 * We have to load KLD 2176 */ 2177 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 2178 " is not NULL")); 2179 if (!linker_root_mounted()) 2180 return (ENXIO); 2181 pathname = linker_search_kld(kldname); 2182 } else { 2183 if (modlist_lookup2(modname, verinfo) != NULL) 2184 return (EEXIST); 2185 if (!linker_root_mounted()) 2186 return (ENXIO); 2187 if (kldname != NULL) 2188 pathname = strdup(kldname, M_LINKER); 2189 else 2190 /* 2191 * Need to find a KLD with required module 2192 */ 2193 pathname = linker_search_module(modname, 2194 strlen(modname), verinfo); 2195 } 2196 if (pathname == NULL) 2197 return (ENOENT); 2198 2199 /* 2200 * Can't load more than one file with the same basename XXX: 2201 * Actually it should be possible to have multiple KLDs with 2202 * the same basename but different path because they can 2203 * provide different versions of the same modules. 2204 */ 2205 filename = linker_basename(pathname); 2206 if (linker_find_file_by_name(filename)) 2207 error = EEXIST; 2208 else do { 2209 error = linker_load_file(pathname, &lfdep); 2210 if (error) 2211 break; 2212 if (modname && verinfo && 2213 modlist_lookup2(modname, verinfo) == NULL) { 2214 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2215 error = ENOENT; 2216 break; 2217 } 2218 if (parent) { 2219 error = linker_file_add_dependency(parent, lfdep); 2220 if (error) 2221 break; 2222 } 2223 if (lfpp) 2224 *lfpp = lfdep; 2225 } while (0); 2226 free(pathname, M_LINKER); 2227 return (error); 2228 } 2229 2230 /* 2231 * This routine is responsible for finding dependencies of userland initiated 2232 * kldload(2)'s of files. 2233 */ 2234 int 2235 linker_load_dependencies(linker_file_t lf) 2236 { 2237 linker_file_t lfdep; 2238 struct mod_metadata **start, **stop, **mdp, **nmdp; 2239 struct mod_metadata *mp, *nmp; 2240 const struct mod_depend *verinfo; 2241 modlist_t mod; 2242 const char *modname, *nmodname; 2243 int ver, error = 0; 2244 2245 /* 2246 * All files are dependent on /kernel. 2247 */ 2248 sx_assert(&kld_sx, SA_XLOCKED); 2249 if (linker_kernel_file) { 2250 linker_kernel_file->refs++; 2251 error = linker_file_add_dependency(lf, linker_kernel_file); 2252 if (error) 2253 return (error); 2254 } 2255 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2256 NULL) != 0) 2257 return (0); 2258 for (mdp = start; mdp < stop; mdp++) { 2259 mp = *mdp; 2260 if (mp->md_type != MDT_VERSION) 2261 continue; 2262 modname = mp->md_cval; 2263 ver = ((const struct mod_version *)mp->md_data)->mv_version; 2264 mod = modlist_lookup(modname, ver); 2265 if (mod != NULL) { 2266 printf("interface %s.%d already present in the KLD" 2267 " '%s'!\n", modname, ver, 2268 mod->container->filename); 2269 return (EEXIST); 2270 } 2271 } 2272 2273 for (mdp = start; mdp < stop; mdp++) { 2274 mp = *mdp; 2275 if (mp->md_type != MDT_DEPEND) 2276 continue; 2277 modname = mp->md_cval; 2278 verinfo = mp->md_data; 2279 nmodname = NULL; 2280 for (nmdp = start; nmdp < stop; nmdp++) { 2281 nmp = *nmdp; 2282 if (nmp->md_type != MDT_VERSION) 2283 continue; 2284 nmodname = nmp->md_cval; 2285 if (strcmp(modname, nmodname) == 0) 2286 break; 2287 } 2288 if (nmdp < stop)/* early exit, it's a self reference */ 2289 continue; 2290 mod = modlist_lookup2(modname, verinfo); 2291 if (mod) { /* woohoo, it's loaded already */ 2292 lfdep = mod->container; 2293 lfdep->refs++; 2294 error = linker_file_add_dependency(lf, lfdep); 2295 if (error) 2296 break; 2297 continue; 2298 } 2299 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2300 if (error) { 2301 printf("KLD %s: depends on %s - not available or" 2302 " version mismatch\n", lf->filename, modname); 2303 break; 2304 } 2305 } 2306 2307 if (error) 2308 return (error); 2309 linker_addmodules(lf, start, stop, 0); 2310 return (error); 2311 } 2312 2313 static int 2314 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2315 { 2316 struct sysctl_req *req; 2317 2318 req = opaque; 2319 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2320 } 2321 2322 /* 2323 * Export a nul-separated, double-nul-terminated list of all function names 2324 * in the kernel. 2325 */ 2326 static int 2327 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2328 { 2329 linker_file_t lf; 2330 int error; 2331 2332 #ifdef MAC 2333 error = mac_kld_check_stat(req->td->td_ucred); 2334 if (error) 2335 return (error); 2336 #endif 2337 error = sysctl_wire_old_buffer(req, 0); 2338 if (error != 0) 2339 return (error); 2340 sx_xlock(&kld_sx); 2341 TAILQ_FOREACH(lf, &linker_files, link) { 2342 error = LINKER_EACH_FUNCTION_NAME(lf, 2343 sysctl_kern_function_list_iterate, req); 2344 if (error) { 2345 sx_xunlock(&kld_sx); 2346 return (error); 2347 } 2348 } 2349 sx_xunlock(&kld_sx); 2350 return (SYSCTL_OUT(req, "", 1)); 2351 } 2352 2353 SYSCTL_PROC(_kern, OID_AUTO, function_list, 2354 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 2355 sysctl_kern_function_list, "", 2356 "kernel function list"); 2357