1 /*- 2 * Copyright (c) 1997-2000 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_ddb.h" 31 #include "opt_mac.h" 32 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/sysproto.h> 38 #include <sys/sysent.h> 39 #include <sys/proc.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/sx.h> 43 #include <sys/mac.h> 44 #include <sys/module.h> 45 #include <sys/linker.h> 46 #include <sys/fcntl.h> 47 #include <sys/libkern.h> 48 #include <sys/namei.h> 49 #include <sys/vnode.h> 50 #include <sys/sysctl.h> 51 52 #include "linker_if.h" 53 54 #ifdef KLD_DEBUG 55 int kld_debug = 0; 56 #endif 57 58 /* 59 * static char *linker_search_path(const char *name, struct mod_depend 60 * *verinfo); 61 */ 62 static const char *linker_basename(const char *path); 63 64 /* Metadata from the static kernel */ 65 SET_DECLARE(modmetadata_set, struct mod_metadata); 66 67 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 68 69 linker_file_t linker_kernel_file; 70 71 static struct mtx kld_mtx; /* kernel linker mutex */ 72 73 static linker_class_list_t classes; 74 static linker_file_list_t linker_files; 75 static int next_file_id = 1; 76 static int linker_no_more_classes = 0; 77 78 #define LINKER_GET_NEXT_FILE_ID(a) do { \ 79 linker_file_t lftmp; \ 80 \ 81 retry: \ 82 mtx_lock(&kld_mtx); \ 83 TAILQ_FOREACH(lftmp, &linker_files, link) { \ 84 if (next_file_id == lftmp->id) { \ 85 next_file_id++; \ 86 mtx_unlock(&kld_mtx); \ 87 goto retry; \ 88 } \ 89 } \ 90 (a) = next_file_id; \ 91 mtx_unlock(&kld_mtx); /* Hold for safe read of id variable */ \ 92 } while(0) 93 94 95 /* XXX wrong name; we're looking at version provision tags here, not modules */ 96 typedef TAILQ_HEAD(, modlist) modlisthead_t; 97 struct modlist { 98 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 99 linker_file_t container; 100 const char *name; 101 int version; 102 }; 103 typedef struct modlist *modlist_t; 104 static modlisthead_t found_modules; 105 106 static modlist_t modlist_lookup2(const char *name, 107 struct mod_depend *verinfo); 108 109 static char * 110 linker_strdup(const char *str) 111 { 112 char *result; 113 114 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 115 strcpy(result, str); 116 return (result); 117 } 118 119 static void 120 linker_init(void *arg) 121 { 122 123 mtx_init(&kld_mtx, "kernel linker", NULL, MTX_DEF); 124 TAILQ_INIT(&classes); 125 TAILQ_INIT(&linker_files); 126 } 127 128 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0) 129 130 static void 131 linker_stop_class_add(void *arg) 132 { 133 134 linker_no_more_classes = 1; 135 } 136 137 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL) 138 139 int 140 linker_add_class(linker_class_t lc) 141 { 142 143 /* 144 * We disallow any class registration passt SI_ORDER_ANY 145 * of SI_SUB_KLD. 146 */ 147 if (linker_no_more_classes == 1) 148 return (EPERM); 149 kobj_class_compile((kobj_class_t) lc); 150 ((kobj_class_t)lc)->refs++; /* prevent ops being freed */ 151 TAILQ_INSERT_TAIL(&classes, lc, link); 152 return (0); 153 } 154 155 static void 156 linker_file_sysinit(linker_file_t lf) 157 { 158 struct sysinit **start, **stop, **sipp, **xipp, *save; 159 160 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 161 lf->filename)); 162 163 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 164 return; 165 /* 166 * Perform a bubble sort of the system initialization objects by 167 * their subsystem (primary key) and order (secondary key). 168 * 169 * Since some things care about execution order, this is the operation 170 * which ensures continued function. 171 */ 172 for (sipp = start; sipp < stop; sipp++) { 173 for (xipp = sipp + 1; xipp < stop; xipp++) { 174 if ((*sipp)->subsystem < (*xipp)->subsystem || 175 ((*sipp)->subsystem == (*xipp)->subsystem && 176 (*sipp)->order <= (*xipp)->order)) 177 continue; /* skip */ 178 save = *sipp; 179 *sipp = *xipp; 180 *xipp = save; 181 } 182 } 183 184 /* 185 * Traverse the (now) ordered list of system initialization tasks. 186 * Perform each task, and continue on to the next task. 187 */ 188 for (sipp = start; sipp < stop; sipp++) { 189 if ((*sipp)->subsystem == SI_SUB_DUMMY) 190 continue; /* skip dummy task(s) */ 191 192 /* Call function */ 193 (*((*sipp)->func)) ((*sipp)->udata); 194 } 195 } 196 197 static void 198 linker_file_sysuninit(linker_file_t lf) 199 { 200 struct sysinit **start, **stop, **sipp, **xipp, *save; 201 202 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 203 lf->filename)); 204 205 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 206 NULL) != 0) 207 return; 208 209 /* 210 * Perform a reverse bubble sort of the system initialization objects 211 * by their subsystem (primary key) and order (secondary key). 212 * 213 * Since some things care about execution order, this is the operation 214 * which ensures continued function. 215 */ 216 for (sipp = start; sipp < stop; sipp++) { 217 for (xipp = sipp + 1; xipp < stop; xipp++) { 218 if ((*sipp)->subsystem > (*xipp)->subsystem || 219 ((*sipp)->subsystem == (*xipp)->subsystem && 220 (*sipp)->order >= (*xipp)->order)) 221 continue; /* skip */ 222 save = *sipp; 223 *sipp = *xipp; 224 *xipp = save; 225 } 226 } 227 228 /* 229 * Traverse the (now) ordered list of system initialization tasks. 230 * Perform each task, and continue on to the next task. 231 */ 232 for (sipp = start; sipp < stop; sipp++) { 233 if ((*sipp)->subsystem == SI_SUB_DUMMY) 234 continue; /* skip dummy task(s) */ 235 236 /* Call function */ 237 (*((*sipp)->func)) ((*sipp)->udata); 238 } 239 } 240 241 static void 242 linker_file_register_sysctls(linker_file_t lf) 243 { 244 struct sysctl_oid **start, **stop, **oidp; 245 246 KLD_DPF(FILE, 247 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 248 lf->filename)); 249 250 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 251 return; 252 253 for (oidp = start; oidp < stop; oidp++) 254 sysctl_register_oid(*oidp); 255 } 256 257 static void 258 linker_file_unregister_sysctls(linker_file_t lf) 259 { 260 struct sysctl_oid **start, **stop, **oidp; 261 262 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs" 263 " for %s\n", lf->filename)); 264 265 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 266 return; 267 268 for (oidp = start; oidp < stop; oidp++) 269 sysctl_unregister_oid(*oidp); 270 } 271 272 static int 273 linker_file_register_modules(linker_file_t lf) 274 { 275 struct mod_metadata **start, **stop, **mdp; 276 const moduledata_t *moddata; 277 int error; 278 279 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 280 " in %s\n", lf->filename)); 281 282 if (linker_file_lookup_set(lf, "modmetadata_set", &start, 283 &stop, 0) != 0) { 284 /* 285 * This fallback should be unnecessary, but if we get booted 286 * from boot2 instead of loader and we are missing our 287 * metadata then we have to try the best we can. 288 */ 289 if (lf == linker_kernel_file) { 290 start = SET_BEGIN(modmetadata_set); 291 stop = SET_LIMIT(modmetadata_set); 292 } else 293 return (0); 294 } 295 for (mdp = start; mdp < stop; mdp++) { 296 if ((*mdp)->md_type != MDT_MODULE) 297 continue; 298 moddata = (*mdp)->md_data; 299 KLD_DPF(FILE, ("Registering module %s in %s\n", 300 moddata->name, lf->filename)); 301 error = module_register(moddata, lf); 302 if (error) 303 printf("Module %s failed to register: %d\n", 304 moddata->name, error); 305 } 306 return (0); 307 } 308 309 static void 310 linker_init_kernel_modules(void) 311 { 312 313 linker_file_register_modules(linker_kernel_file); 314 } 315 316 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0) 317 318 static int 319 linker_load_file(const char *filename, linker_file_t *result) 320 { 321 linker_class_t lc; 322 linker_file_t lf; 323 int foundfile, error = 0; 324 325 /* Refuse to load modules if securelevel raised */ 326 if (securelevel > 0) 327 return (EPERM); 328 329 lf = linker_find_file_by_name(filename); 330 if (lf) { 331 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 332 " incrementing refs\n", filename)); 333 *result = lf; 334 lf->refs++; 335 goto out; 336 } 337 lf = NULL; 338 foundfile = 0; 339 340 /* 341 * We do not need to protect (lock) classes here because there is 342 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 343 * and there is no class deregistration mechanism at this time. 344 */ 345 TAILQ_FOREACH(lc, &classes, link) { 346 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 347 filename)); 348 error = LINKER_LOAD_FILE(lc, filename, &lf); 349 /* 350 * If we got something other than ENOENT, then it exists but 351 * we cannot load it for some other reason. 352 */ 353 if (error != ENOENT) 354 foundfile = 1; 355 if (lf) { 356 linker_file_register_modules(lf); 357 linker_file_register_sysctls(lf); 358 linker_file_sysinit(lf); 359 lf->flags |= LINKER_FILE_LINKED; 360 *result = lf; 361 error = 0; 362 goto out; 363 } 364 } 365 /* 366 * Less than ideal, but tells the user whether it failed to load or 367 * the module was not found. 368 */ 369 if (foundfile) { 370 /* 371 * Format not recognized or otherwise unloadable. 372 * When loading a module that is statically built into 373 * the kernel EEXIST percolates back up as the return 374 * value. Preserve this so that apps like sysinstall 375 * can recognize this special case and not post bogus 376 * dialog boxes. 377 */ 378 if (error != EEXIST) 379 error = ENOEXEC; 380 } else 381 error = ENOENT; /* Nothing found */ 382 out: 383 return (error); 384 } 385 386 int 387 linker_reference_module(const char *modname, struct mod_depend *verinfo, 388 linker_file_t *result) 389 { 390 modlist_t mod; 391 392 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 393 *result = mod->container; 394 (*result)->refs++; 395 return (0); 396 } 397 398 return (linker_load_module(NULL, modname, NULL, verinfo, result)); 399 } 400 401 linker_file_t 402 linker_find_file_by_name(const char *filename) 403 { 404 linker_file_t lf = 0; 405 char *koname; 406 407 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 408 if (koname == NULL) 409 goto out; 410 sprintf(koname, "%s.ko", filename); 411 412 mtx_lock(&kld_mtx); 413 TAILQ_FOREACH(lf, &linker_files, link) { 414 if (strcmp(lf->filename, koname) == 0) 415 break; 416 if (strcmp(lf->filename, filename) == 0) 417 break; 418 } 419 mtx_unlock(&kld_mtx); 420 out: 421 if (koname) 422 free(koname, M_LINKER); 423 return (lf); 424 } 425 426 linker_file_t 427 linker_find_file_by_id(int fileid) 428 { 429 linker_file_t lf = 0; 430 431 mtx_lock(&kld_mtx); 432 TAILQ_FOREACH(lf, &linker_files, link) 433 if (lf->id == fileid) 434 break; 435 mtx_unlock(&kld_mtx); 436 return (lf); 437 } 438 439 linker_file_t 440 linker_make_file(const char *pathname, linker_class_t lc) 441 { 442 linker_file_t lf; 443 const char *filename; 444 445 lf = NULL; 446 filename = linker_basename(pathname); 447 448 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 449 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 450 if (lf == NULL) 451 goto out; 452 lf->refs = 1; 453 lf->userrefs = 0; 454 lf->flags = 0; 455 lf->filename = linker_strdup(filename); 456 LINKER_GET_NEXT_FILE_ID(lf->id); 457 lf->ndeps = 0; 458 lf->deps = NULL; 459 STAILQ_INIT(&lf->common); 460 TAILQ_INIT(&lf->modules); 461 mtx_lock(&kld_mtx); 462 TAILQ_INSERT_TAIL(&linker_files, lf, link); 463 mtx_unlock(&kld_mtx); 464 out: 465 return (lf); 466 } 467 468 int 469 linker_file_unload(linker_file_t file) 470 { 471 module_t mod, next; 472 modlist_t ml, nextml; 473 struct common_symbol *cp; 474 int error, i; 475 476 error = 0; 477 478 /* Refuse to unload modules if securelevel raised. */ 479 if (securelevel > 0) 480 return (EPERM); 481 #ifdef MAC 482 error = mac_check_kld_unload(curthread->td_ucred); 483 if (error) 484 return (error); 485 #endif 486 487 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 488 if (file->refs == 1) { 489 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 490 " informing modules\n")); 491 492 /* 493 * Inform any modules associated with this file. 494 */ 495 MOD_XLOCK; 496 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 497 next = module_getfnext(mod); 498 MOD_XUNLOCK; 499 500 /* 501 * Give the module a chance to veto the unload. 502 */ 503 if ((error = module_unload(mod)) != 0) { 504 KLD_DPF(FILE, ("linker_file_unload: module %p" 505 " vetoes unload\n", mod)); 506 goto out; 507 } else 508 MOD_XLOCK; 509 module_release(mod); 510 } 511 MOD_XUNLOCK; 512 } 513 file->refs--; 514 if (file->refs > 0) { 515 goto out; 516 } 517 for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) { 518 nextml = TAILQ_NEXT(ml, link); 519 if (ml->container == file) { 520 TAILQ_REMOVE(&found_modules, ml, link); 521 free(ml, M_LINKER); 522 } 523 } 524 525 /* 526 * Don't try to run SYSUNINITs if we are unloaded due to a 527 * link error. 528 */ 529 if (file->flags & LINKER_FILE_LINKED) { 530 linker_file_sysuninit(file); 531 linker_file_unregister_sysctls(file); 532 } 533 mtx_lock(&kld_mtx); 534 TAILQ_REMOVE(&linker_files, file, link); 535 mtx_unlock(&kld_mtx); 536 537 if (file->deps) { 538 for (i = 0; i < file->ndeps; i++) 539 linker_file_unload(file->deps[i]); 540 free(file->deps, M_LINKER); 541 file->deps = NULL; 542 } 543 for (cp = STAILQ_FIRST(&file->common); cp; 544 cp = STAILQ_FIRST(&file->common)) { 545 STAILQ_REMOVE(&file->common, cp, common_symbol, link); 546 free(cp, M_LINKER); 547 } 548 549 LINKER_UNLOAD(file); 550 if (file->filename) { 551 free(file->filename, M_LINKER); 552 file->filename = NULL; 553 } 554 kobj_delete((kobj_t) file, M_LINKER); 555 out: 556 return (error); 557 } 558 559 int 560 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 561 { 562 linker_file_t *newdeps; 563 564 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 565 M_LINKER, M_WAITOK | M_ZERO); 566 if (newdeps == NULL) 567 return (ENOMEM); 568 569 if (file->deps) { 570 bcopy(file->deps, newdeps, 571 file->ndeps * sizeof(linker_file_t *)); 572 free(file->deps, M_LINKER); 573 } 574 file->deps = newdeps; 575 file->deps[file->ndeps] = dep; 576 file->ndeps++; 577 return (0); 578 } 579 580 /* 581 * Locate a linker set and its contents. This is a helper function to avoid 582 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void *** 583 */ 584 int 585 linker_file_lookup_set(linker_file_t file, const char *name, 586 void *firstp, void *lastp, int *countp) 587 { 588 589 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 590 } 591 592 caddr_t 593 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 594 { 595 c_linker_sym_t sym; 596 linker_symval_t symval; 597 caddr_t address; 598 size_t common_size = 0; 599 int i; 600 601 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 602 file, name, deps)); 603 604 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 605 LINKER_SYMBOL_VALUES(file, sym, &symval); 606 if (symval.value == 0) 607 /* 608 * For commons, first look them up in the 609 * dependencies and only allocate space if not found 610 * there. 611 */ 612 common_size = symval.size; 613 else { 614 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 615 ".value=%p\n", symval.value)); 616 return (symval.value); 617 } 618 } 619 if (deps) { 620 for (i = 0; i < file->ndeps; i++) { 621 address = linker_file_lookup_symbol(file->deps[i], 622 name, 0); 623 if (address) { 624 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 625 " deps value=%p\n", address)); 626 return (address); 627 } 628 } 629 } 630 if (common_size > 0) { 631 /* 632 * This is a common symbol which was not found in the 633 * dependencies. We maintain a simple common symbol table in 634 * the file object. 635 */ 636 struct common_symbol *cp; 637 638 STAILQ_FOREACH(cp, &file->common, link) { 639 if (strcmp(cp->name, name) == 0) { 640 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 641 " old common value=%p\n", cp->address)); 642 return (cp->address); 643 } 644 } 645 /* 646 * Round the symbol size up to align. 647 */ 648 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 649 cp = malloc(sizeof(struct common_symbol) 650 + common_size + strlen(name) + 1, M_LINKER, 651 M_WAITOK | M_ZERO); 652 if (cp == NULL) { 653 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 654 return (0); 655 } 656 cp->address = (caddr_t)(cp + 1); 657 cp->name = cp->address + common_size; 658 strcpy(cp->name, name); 659 bzero(cp->address, common_size); 660 STAILQ_INSERT_TAIL(&file->common, cp, link); 661 662 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 663 " value=%p\n", cp->address)); 664 return (cp->address); 665 } 666 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 667 return (0); 668 } 669 670 #ifdef DDB 671 /* 672 * DDB Helpers. DDB has to look across multiple files with their own symbol 673 * tables and string tables. 674 * 675 * Note that we do not obey list locking protocols here. We really don't need 676 * DDB to hang because somebody's got the lock held. We'll take the chance 677 * that the files list is inconsistant instead. 678 */ 679 680 int 681 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 682 { 683 linker_file_t lf; 684 685 TAILQ_FOREACH(lf, &linker_files, link) { 686 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 687 return (0); 688 } 689 return (ENOENT); 690 } 691 692 int 693 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 694 { 695 linker_file_t lf; 696 c_linker_sym_t best, es; 697 u_long diff, bestdiff, off; 698 699 best = 0; 700 off = (uintptr_t)value; 701 bestdiff = off; 702 TAILQ_FOREACH(lf, &linker_files, link) { 703 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 704 continue; 705 if (es != 0 && diff < bestdiff) { 706 best = es; 707 bestdiff = diff; 708 } 709 if (bestdiff == 0) 710 break; 711 } 712 if (best) { 713 *sym = best; 714 *diffp = bestdiff; 715 return (0); 716 } else { 717 *sym = 0; 718 *diffp = off; 719 return (ENOENT); 720 } 721 } 722 723 int 724 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 725 { 726 linker_file_t lf; 727 728 TAILQ_FOREACH(lf, &linker_files, link) { 729 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 730 return (0); 731 } 732 return (ENOENT); 733 } 734 #endif 735 736 /* 737 * Syscalls. 738 */ 739 /* 740 * MPSAFE 741 */ 742 int 743 kldload(struct thread *td, struct kldload_args *uap) 744 { 745 char *kldname, *modname; 746 char *pathname = NULL; 747 linker_file_t lf; 748 int error = 0; 749 750 td->td_retval[0] = -1; 751 752 mtx_lock(&Giant); 753 754 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 755 goto out; 756 757 if ((error = suser(td)) != 0) 758 goto out; 759 760 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 761 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 762 goto out; 763 764 /* 765 * If path do not contain qualified name or any dot in it 766 * (kldname.ko, or kldname.ver.ko) treat it as interface 767 * name. 768 */ 769 if (index(pathname, '/') || index(pathname, '.')) { 770 kldname = pathname; 771 modname = NULL; 772 } else { 773 kldname = NULL; 774 modname = pathname; 775 } 776 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 777 if (error) 778 goto out; 779 780 lf->userrefs++; 781 td->td_retval[0] = lf->id; 782 out: 783 if (pathname) 784 free(pathname, M_TEMP); 785 mtx_unlock(&Giant); 786 return (error); 787 } 788 789 /* 790 * MPSAFE 791 */ 792 int 793 kldunload(struct thread *td, struct kldunload_args *uap) 794 { 795 linker_file_t lf; 796 int error = 0; 797 798 mtx_lock(&Giant); 799 800 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 801 goto out; 802 803 if ((error = suser(td)) != 0) 804 goto out; 805 806 lf = linker_find_file_by_id(uap->fileid); 807 if (lf) { 808 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 809 if (lf->userrefs == 0) { 810 printf("kldunload: attempt to unload file that was" 811 " loaded by the kernel\n"); 812 error = EBUSY; 813 goto out; 814 } 815 lf->userrefs--; 816 error = linker_file_unload(lf); 817 if (error) 818 lf->userrefs++; 819 } else 820 error = ENOENT; 821 out: 822 mtx_unlock(&Giant); 823 return (error); 824 } 825 826 /* 827 * MPSAFE 828 */ 829 int 830 kldfind(struct thread *td, struct kldfind_args *uap) 831 { 832 char *pathname; 833 const char *filename; 834 linker_file_t lf; 835 int error = 0; 836 837 #ifdef MAC 838 error = mac_check_kld_stat(td->td_ucred); 839 if (error) 840 return (error); 841 #endif 842 843 mtx_lock(&Giant); 844 td->td_retval[0] = -1; 845 846 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 847 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 848 goto out; 849 850 filename = linker_basename(pathname); 851 lf = linker_find_file_by_name(filename); 852 if (lf) 853 td->td_retval[0] = lf->id; 854 else 855 error = ENOENT; 856 out: 857 if (pathname) 858 free(pathname, M_TEMP); 859 mtx_unlock(&Giant); 860 return (error); 861 } 862 863 /* 864 * MPSAFE 865 */ 866 int 867 kldnext(struct thread *td, struct kldnext_args *uap) 868 { 869 linker_file_t lf; 870 int error = 0; 871 872 #ifdef MAC 873 error = mac_check_kld_stat(td->td_ucred); 874 if (error) 875 return (error); 876 #endif 877 878 mtx_lock(&Giant); 879 880 if (uap->fileid == 0) { 881 mtx_lock(&kld_mtx); 882 if (TAILQ_FIRST(&linker_files)) 883 td->td_retval[0] = TAILQ_FIRST(&linker_files)->id; 884 else 885 td->td_retval[0] = 0; 886 mtx_unlock(&kld_mtx); 887 goto out; 888 } 889 lf = linker_find_file_by_id(uap->fileid); 890 if (lf) { 891 if (TAILQ_NEXT(lf, link)) 892 td->td_retval[0] = TAILQ_NEXT(lf, link)->id; 893 else 894 td->td_retval[0] = 0; 895 } else 896 error = ENOENT; 897 out: 898 mtx_unlock(&Giant); 899 return (error); 900 } 901 902 /* 903 * MPSAFE 904 */ 905 int 906 kldstat(struct thread *td, struct kldstat_args *uap) 907 { 908 linker_file_t lf; 909 int error = 0; 910 int namelen, version; 911 struct kld_file_stat *stat; 912 913 #ifdef MAC 914 error = mac_check_kld_stat(td->td_ucred); 915 if (error) 916 return (error); 917 #endif 918 919 mtx_lock(&Giant); 920 921 lf = linker_find_file_by_id(uap->fileid); 922 if (lf == NULL) { 923 error = ENOENT; 924 goto out; 925 } 926 stat = uap->stat; 927 928 /* 929 * Check the version of the user's structure. 930 */ 931 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 932 goto out; 933 if (version != sizeof(struct kld_file_stat)) { 934 error = EINVAL; 935 goto out; 936 } 937 namelen = strlen(lf->filename) + 1; 938 if (namelen > MAXPATHLEN) 939 namelen = MAXPATHLEN; 940 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 941 goto out; 942 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 943 goto out; 944 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 945 goto out; 946 if ((error = copyout(&lf->address, &stat->address, 947 sizeof(caddr_t))) != 0) 948 goto out; 949 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 950 goto out; 951 952 td->td_retval[0] = 0; 953 out: 954 mtx_unlock(&Giant); 955 return (error); 956 } 957 958 /* 959 * MPSAFE 960 */ 961 int 962 kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 963 { 964 linker_file_t lf; 965 module_t mp; 966 int error = 0; 967 968 #ifdef MAC 969 error = mac_check_kld_stat(td->td_ucred); 970 if (error) 971 return (error); 972 #endif 973 974 mtx_lock(&Giant); 975 lf = linker_find_file_by_id(uap->fileid); 976 if (lf) { 977 MOD_SLOCK; 978 mp = TAILQ_FIRST(&lf->modules); 979 if (mp != NULL) 980 td->td_retval[0] = module_getid(mp); 981 else 982 td->td_retval[0] = 0; 983 MOD_SUNLOCK; 984 } else 985 error = ENOENT; 986 mtx_unlock(&Giant); 987 return (error); 988 } 989 990 /* 991 * MPSAFE 992 */ 993 int 994 kldsym(struct thread *td, struct kldsym_args *uap) 995 { 996 char *symstr = NULL; 997 c_linker_sym_t sym; 998 linker_symval_t symval; 999 linker_file_t lf; 1000 struct kld_sym_lookup lookup; 1001 int error = 0; 1002 1003 #ifdef MAC 1004 error = mac_check_kld_stat(td->td_ucred); 1005 if (error) 1006 return (error); 1007 #endif 1008 1009 mtx_lock(&Giant); 1010 1011 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1012 goto out; 1013 if (lookup.version != sizeof(lookup) || 1014 uap->cmd != KLDSYM_LOOKUP) { 1015 error = EINVAL; 1016 goto out; 1017 } 1018 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1019 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1020 goto out; 1021 if (uap->fileid != 0) { 1022 lf = linker_find_file_by_id(uap->fileid); 1023 if (lf == NULL) { 1024 error = ENOENT; 1025 goto out; 1026 } 1027 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1028 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1029 lookup.symvalue = (uintptr_t) symval.value; 1030 lookup.symsize = symval.size; 1031 error = copyout(&lookup, uap->data, sizeof(lookup)); 1032 } else 1033 error = ENOENT; 1034 } else { 1035 mtx_lock(&kld_mtx); 1036 TAILQ_FOREACH(lf, &linker_files, link) { 1037 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1038 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1039 lookup.symvalue = (uintptr_t)symval.value; 1040 lookup.symsize = symval.size; 1041 error = copyout(&lookup, uap->data, 1042 sizeof(lookup)); 1043 break; 1044 } 1045 } 1046 mtx_unlock(&kld_mtx); 1047 if (lf == NULL) 1048 error = ENOENT; 1049 } 1050 out: 1051 if (symstr) 1052 free(symstr, M_TEMP); 1053 mtx_unlock(&Giant); 1054 return (error); 1055 } 1056 1057 /* 1058 * Preloaded module support 1059 */ 1060 1061 static modlist_t 1062 modlist_lookup(const char *name, int ver) 1063 { 1064 modlist_t mod; 1065 1066 TAILQ_FOREACH(mod, &found_modules, link) { 1067 if (strcmp(mod->name, name) == 0 && 1068 (ver == 0 || mod->version == ver)) 1069 return (mod); 1070 } 1071 return (NULL); 1072 } 1073 1074 static modlist_t 1075 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1076 { 1077 modlist_t mod, bestmod; 1078 int ver; 1079 1080 if (verinfo == NULL) 1081 return (modlist_lookup(name, 0)); 1082 bestmod = NULL; 1083 for (mod = TAILQ_FIRST(&found_modules); mod; 1084 mod = TAILQ_NEXT(mod, link)) { 1085 if (strcmp(mod->name, name) != 0) 1086 continue; 1087 ver = mod->version; 1088 if (ver == verinfo->md_ver_preferred) 1089 return (mod); 1090 if (ver >= verinfo->md_ver_minimum && 1091 ver <= verinfo->md_ver_maximum && 1092 (bestmod == NULL || ver > bestmod->version)) 1093 bestmod = mod; 1094 } 1095 return (bestmod); 1096 } 1097 1098 static modlist_t 1099 modlist_newmodule(const char *modname, int version, linker_file_t container) 1100 { 1101 modlist_t mod; 1102 1103 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1104 if (mod == NULL) 1105 panic("no memory for module list"); 1106 mod->container = container; 1107 mod->name = modname; 1108 mod->version = version; 1109 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1110 return (mod); 1111 } 1112 1113 static void 1114 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1115 struct mod_metadata **stop, int preload) 1116 { 1117 struct mod_metadata *mp, **mdp; 1118 const char *modname; 1119 int ver; 1120 1121 for (mdp = start; mdp < stop; mdp++) { 1122 mp = *mdp; 1123 if (mp->md_type != MDT_VERSION) 1124 continue; 1125 modname = mp->md_cval; 1126 ver = ((struct mod_version *)mp->md_data)->mv_version; 1127 if (modlist_lookup(modname, ver) != NULL) { 1128 printf("module %s already present!\n", modname); 1129 /* XXX what can we do? this is a build error. :-( */ 1130 continue; 1131 } 1132 modlist_newmodule(modname, ver, lf); 1133 } 1134 } 1135 1136 static void 1137 linker_preload(void *arg) 1138 { 1139 caddr_t modptr; 1140 const char *modname, *nmodname; 1141 char *modtype; 1142 linker_file_t lf; 1143 linker_class_t lc; 1144 int error; 1145 linker_file_list_t loaded_files; 1146 linker_file_list_t depended_files; 1147 struct mod_metadata *mp, *nmp; 1148 struct mod_metadata **start, **stop, **mdp, **nmdp; 1149 struct mod_depend *verinfo; 1150 int nver; 1151 int resolves; 1152 modlist_t mod; 1153 struct sysinit **si_start, **si_stop; 1154 1155 TAILQ_INIT(&loaded_files); 1156 TAILQ_INIT(&depended_files); 1157 TAILQ_INIT(&found_modules); 1158 error = 0; 1159 1160 modptr = NULL; 1161 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1162 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1163 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1164 if (modname == NULL) { 1165 printf("Preloaded module at %p does not have a" 1166 " name!\n", modptr); 1167 continue; 1168 } 1169 if (modtype == NULL) { 1170 printf("Preloaded module at %p does not have a type!\n", 1171 modptr); 1172 continue; 1173 } 1174 if (bootverbose) 1175 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1176 modptr); 1177 lf = NULL; 1178 TAILQ_FOREACH(lc, &classes, link) { 1179 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1180 if (error) { 1181 lf = NULL; 1182 break; 1183 } 1184 } 1185 if (lf) 1186 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1187 } 1188 1189 /* 1190 * First get a list of stuff in the kernel. 1191 */ 1192 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1193 &stop, NULL) == 0) 1194 linker_addmodules(linker_kernel_file, start, stop, 1); 1195 1196 /* 1197 * this is a once-off kinky bubble sort resolve relocation dependency 1198 * requirements 1199 */ 1200 restart: 1201 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1202 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1203 &stop, NULL); 1204 /* 1205 * First, look to see if we would successfully link with this 1206 * stuff. 1207 */ 1208 resolves = 1; /* unless we know otherwise */ 1209 if (!error) { 1210 for (mdp = start; mdp < stop; mdp++) { 1211 mp = *mdp; 1212 if (mp->md_type != MDT_DEPEND) 1213 continue; 1214 modname = mp->md_cval; 1215 verinfo = mp->md_data; 1216 for (nmdp = start; nmdp < stop; nmdp++) { 1217 nmp = *nmdp; 1218 if (nmp->md_type != MDT_VERSION) 1219 continue; 1220 nmodname = nmp->md_cval; 1221 if (strcmp(modname, nmodname) == 0) 1222 break; 1223 } 1224 if (nmdp < stop) /* it's a self reference */ 1225 continue; 1226 1227 /* 1228 * ok, the module isn't here yet, we 1229 * are not finished 1230 */ 1231 if (modlist_lookup2(modname, verinfo) == NULL) 1232 resolves = 0; 1233 } 1234 } 1235 /* 1236 * OK, if we found our modules, we can link. So, "provide" 1237 * the modules inside and add it to the end of the link order 1238 * list. 1239 */ 1240 if (resolves) { 1241 if (!error) { 1242 for (mdp = start; mdp < stop; mdp++) { 1243 mp = *mdp; 1244 if (mp->md_type != MDT_VERSION) 1245 continue; 1246 modname = mp->md_cval; 1247 nver = ((struct mod_version *) 1248 mp->md_data)->mv_version; 1249 if (modlist_lookup(modname, 1250 nver) != NULL) { 1251 printf("module %s already" 1252 " present!\n", modname); 1253 linker_file_unload(lf); 1254 TAILQ_REMOVE(&loaded_files, 1255 lf, loaded); 1256 /* we changed tailq next ptr */ 1257 goto restart; 1258 } 1259 modlist_newmodule(modname, nver, lf); 1260 } 1261 } 1262 TAILQ_REMOVE(&loaded_files, lf, loaded); 1263 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1264 /* 1265 * Since we provided modules, we need to restart the 1266 * sort so that the previous files that depend on us 1267 * have a chance. Also, we've busted the tailq next 1268 * pointer with the REMOVE. 1269 */ 1270 goto restart; 1271 } 1272 } 1273 1274 /* 1275 * At this point, we check to see what could not be resolved.. 1276 */ 1277 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1278 printf("KLD file %s is missing dependencies\n", lf->filename); 1279 linker_file_unload(lf); 1280 TAILQ_REMOVE(&loaded_files, lf, loaded); 1281 } 1282 1283 /* 1284 * We made it. Finish off the linking in the order we determined. 1285 */ 1286 TAILQ_FOREACH(lf, &depended_files, loaded) { 1287 if (linker_kernel_file) { 1288 linker_kernel_file->refs++; 1289 error = linker_file_add_dependency(lf, 1290 linker_kernel_file); 1291 if (error) 1292 panic("cannot add dependency"); 1293 } 1294 lf->userrefs++; /* so we can (try to) kldunload it */ 1295 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1296 &stop, NULL); 1297 if (!error) { 1298 for (mdp = start; mdp < stop; mdp++) { 1299 mp = *mdp; 1300 if (mp->md_type != MDT_DEPEND) 1301 continue; 1302 modname = mp->md_cval; 1303 verinfo = mp->md_data; 1304 mod = modlist_lookup2(modname, verinfo); 1305 mod->container->refs++; 1306 error = linker_file_add_dependency(lf, 1307 mod->container); 1308 if (error) 1309 panic("cannot add dependency"); 1310 } 1311 } 1312 /* 1313 * Now do relocation etc using the symbol search paths 1314 * established by the dependencies 1315 */ 1316 error = LINKER_LINK_PRELOAD_FINISH(lf); 1317 if (error) { 1318 printf("KLD file %s - could not finalize loading\n", 1319 lf->filename); 1320 linker_file_unload(lf); 1321 continue; 1322 } 1323 linker_file_register_modules(lf); 1324 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1325 &si_stop, NULL) == 0) 1326 sysinit_add(si_start, si_stop); 1327 linker_file_register_sysctls(lf); 1328 lf->flags |= LINKER_FILE_LINKED; 1329 } 1330 /* woohoo! we made it! */ 1331 } 1332 1333 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0) 1334 1335 /* 1336 * Search for a not-loaded module by name. 1337 * 1338 * Modules may be found in the following locations: 1339 * 1340 * - preloaded (result is just the module name) - on disk (result is full path 1341 * to module) 1342 * 1343 * If the module name is qualified in any way (contains path, etc.) the we 1344 * simply return a copy of it. 1345 * 1346 * The search path can be manipulated via sysctl. Note that we use the ';' 1347 * character as a separator to be consistent with the bootloader. 1348 */ 1349 1350 static char linker_hintfile[] = "linker.hints"; 1351 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1352 1353 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1354 sizeof(linker_path), "module load search path"); 1355 1356 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1357 1358 static char *linker_ext_list[] = { 1359 "", 1360 ".ko", 1361 NULL 1362 }; 1363 1364 /* 1365 * Check if file actually exists either with or without extension listed in 1366 * the linker_ext_list. (probably should be generic for the rest of the 1367 * kernel) 1368 */ 1369 static char * 1370 linker_lookup_file(const char *path, int pathlen, const char *name, 1371 int namelen, struct vattr *vap) 1372 { 1373 struct nameidata nd; 1374 struct thread *td = curthread; /* XXX */ 1375 char *result, **cpp, *sep; 1376 int error, len, extlen, reclen, flags; 1377 enum vtype type; 1378 1379 extlen = 0; 1380 for (cpp = linker_ext_list; *cpp; cpp++) { 1381 len = strlen(*cpp); 1382 if (len > extlen) 1383 extlen = len; 1384 } 1385 extlen++; /* trailing '\0' */ 1386 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1387 1388 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1389 result = malloc(reclen, M_LINKER, M_WAITOK); 1390 for (cpp = linker_ext_list; *cpp; cpp++) { 1391 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1392 namelen, name, *cpp); 1393 /* 1394 * Attempt to open the file, and return the path if 1395 * we succeed and it's a regular file. 1396 */ 1397 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1398 flags = FREAD; 1399 error = vn_open(&nd, &flags, 0, -1); 1400 if (error == 0) { 1401 NDFREE(&nd, NDF_ONLY_PNBUF); 1402 type = nd.ni_vp->v_type; 1403 if (vap) 1404 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred, td); 1405 VOP_UNLOCK(nd.ni_vp, 0, td); 1406 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1407 if (type == VREG) 1408 return (result); 1409 } 1410 } 1411 free(result, M_LINKER); 1412 return (NULL); 1413 } 1414 1415 #define INT_ALIGN(base, ptr) ptr = \ 1416 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 1417 1418 /* 1419 * Lookup KLD which contains requested module in the "linker.hints" file. If 1420 * version specification is available, then try to find the best KLD. 1421 * Otherwise just find the latest one. 1422 */ 1423 static char * 1424 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1425 int modnamelen, struct mod_depend *verinfo) 1426 { 1427 struct thread *td = curthread; /* XXX */ 1428 struct ucred *cred = td ? td->td_ucred : NULL; 1429 struct nameidata nd; 1430 struct vattr vattr, mattr; 1431 u_char *hints = NULL; 1432 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1433 int error, ival, bestver, *intp, reclen, found, flags, clen, blen; 1434 1435 result = NULL; 1436 bestver = found = 0; 1437 1438 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1439 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1440 strlen(sep) + 1; 1441 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1442 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1443 linker_hintfile); 1444 1445 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1446 flags = FREAD; 1447 error = vn_open(&nd, &flags, 0, -1); 1448 if (error) 1449 goto bad; 1450 NDFREE(&nd, NDF_ONLY_PNBUF); 1451 if (nd.ni_vp->v_type != VREG) 1452 goto bad; 1453 best = cp = NULL; 1454 error = VOP_GETATTR(nd.ni_vp, &vattr, cred, td); 1455 if (error) 1456 goto bad; 1457 /* 1458 * XXX: we need to limit this number to some reasonable value 1459 */ 1460 if (vattr.va_size > 100 * 1024) { 1461 printf("hints file too large %ld\n", (long)vattr.va_size); 1462 goto bad; 1463 } 1464 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1465 if (hints == NULL) 1466 goto bad; 1467 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1468 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1469 if (error) 1470 goto bad; 1471 VOP_UNLOCK(nd.ni_vp, 0, td); 1472 vn_close(nd.ni_vp, FREAD, cred, td); 1473 nd.ni_vp = NULL; 1474 if (reclen != 0) { 1475 printf("can't read %d\n", reclen); 1476 goto bad; 1477 } 1478 intp = (int *)hints; 1479 ival = *intp++; 1480 if (ival != LINKER_HINTS_VERSION) { 1481 printf("hints file version mismatch %d\n", ival); 1482 goto bad; 1483 } 1484 bufend = hints + vattr.va_size; 1485 recptr = (u_char *)intp; 1486 clen = blen = 0; 1487 while (recptr < bufend && !found) { 1488 intp = (int *)recptr; 1489 reclen = *intp++; 1490 ival = *intp++; 1491 cp = (char *)intp; 1492 switch (ival) { 1493 case MDT_VERSION: 1494 clen = *cp++; 1495 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1496 break; 1497 cp += clen; 1498 INT_ALIGN(hints, cp); 1499 ival = *(int *)cp; 1500 cp += sizeof(int); 1501 clen = *cp++; 1502 if (verinfo == NULL || 1503 ival == verinfo->md_ver_preferred) { 1504 found = 1; 1505 break; 1506 } 1507 if (ival >= verinfo->md_ver_minimum && 1508 ival <= verinfo->md_ver_maximum && 1509 ival > bestver) { 1510 bestver = ival; 1511 best = cp; 1512 blen = clen; 1513 } 1514 break; 1515 default: 1516 break; 1517 } 1518 recptr += reclen + sizeof(int); 1519 } 1520 /* 1521 * Finally check if KLD is in the place 1522 */ 1523 if (found) 1524 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1525 else if (best) 1526 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1527 1528 /* 1529 * KLD is newer than hints file. What we should do now? 1530 */ 1531 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1532 printf("warning: KLD '%s' is newer than the linker.hints" 1533 " file\n", result); 1534 bad: 1535 free(pathbuf, M_LINKER); 1536 if (hints) 1537 free(hints, M_TEMP); 1538 if (nd.ni_vp != NULL) { 1539 VOP_UNLOCK(nd.ni_vp, 0, td); 1540 vn_close(nd.ni_vp, FREAD, cred, td); 1541 } 1542 /* 1543 * If nothing found or hints is absent - fallback to the old 1544 * way by using "kldname[.ko]" as module name. 1545 */ 1546 if (!found && !bestver && result == NULL) 1547 result = linker_lookup_file(path, pathlen, modname, 1548 modnamelen, NULL); 1549 return (result); 1550 } 1551 1552 /* 1553 * Lookup KLD which contains requested module in the all directories. 1554 */ 1555 static char * 1556 linker_search_module(const char *modname, int modnamelen, 1557 struct mod_depend *verinfo) 1558 { 1559 char *cp, *ep, *result; 1560 1561 /* 1562 * traverse the linker path 1563 */ 1564 for (cp = linker_path; *cp; cp = ep + 1) { 1565 /* find the end of this component */ 1566 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1567 result = linker_hints_lookup(cp, ep - cp, modname, 1568 modnamelen, verinfo); 1569 if (result != NULL) 1570 return (result); 1571 if (*ep == 0) 1572 break; 1573 } 1574 return (NULL); 1575 } 1576 1577 /* 1578 * Search for module in all directories listed in the linker_path. 1579 */ 1580 static char * 1581 linker_search_kld(const char *name) 1582 { 1583 char *cp, *ep, *result, **cpp; 1584 int extlen, len; 1585 1586 /* qualified at all? */ 1587 if (index(name, '/')) 1588 return (linker_strdup(name)); 1589 1590 extlen = 0; 1591 for (cpp = linker_ext_list; *cpp; cpp++) { 1592 len = strlen(*cpp); 1593 if (len > extlen) 1594 extlen = len; 1595 } 1596 extlen++; /* trailing '\0' */ 1597 1598 /* traverse the linker path */ 1599 len = strlen(name); 1600 for (ep = linker_path; *ep; ep++) { 1601 cp = ep; 1602 /* find the end of this component */ 1603 for (; *ep != 0 && *ep != ';'; ep++); 1604 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 1605 if (result != NULL) 1606 return (result); 1607 } 1608 return (NULL); 1609 } 1610 1611 static const char * 1612 linker_basename(const char *path) 1613 { 1614 const char *filename; 1615 1616 filename = rindex(path, '/'); 1617 if (filename == NULL) 1618 return path; 1619 if (filename[1]) 1620 filename++; 1621 return (filename); 1622 } 1623 1624 /* 1625 * Find a file which contains given module and load it, if "parent" is not 1626 * NULL, register a reference to it. 1627 */ 1628 int 1629 linker_load_module(const char *kldname, const char *modname, 1630 struct linker_file *parent, struct mod_depend *verinfo, 1631 struct linker_file **lfpp) 1632 { 1633 linker_file_t lfdep; 1634 const char *filename; 1635 char *pathname; 1636 int error; 1637 1638 if (modname == NULL) { 1639 /* 1640 * We have to load KLD 1641 */ 1642 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 1643 " is not NULL")); 1644 pathname = linker_search_kld(kldname); 1645 } else { 1646 if (modlist_lookup2(modname, verinfo) != NULL) 1647 return (EEXIST); 1648 if (kldname != NULL) 1649 pathname = linker_strdup(kldname); 1650 else if (rootvnode == NULL) 1651 pathname = NULL; 1652 else 1653 /* 1654 * Need to find a KLD with required module 1655 */ 1656 pathname = linker_search_module(modname, 1657 strlen(modname), verinfo); 1658 } 1659 if (pathname == NULL) 1660 return (ENOENT); 1661 1662 /* 1663 * Can't load more than one file with the same basename XXX: 1664 * Actually it should be possible to have multiple KLDs with 1665 * the same basename but different path because they can 1666 * provide different versions of the same modules. 1667 */ 1668 filename = linker_basename(pathname); 1669 if (linker_find_file_by_name(filename)) { 1670 error = EEXIST; 1671 goto out; 1672 } 1673 do { 1674 error = linker_load_file(pathname, &lfdep); 1675 if (error) 1676 break; 1677 if (modname && verinfo && 1678 modlist_lookup2(modname, verinfo) == NULL) { 1679 linker_file_unload(lfdep); 1680 error = ENOENT; 1681 break; 1682 } 1683 if (parent) { 1684 error = linker_file_add_dependency(parent, lfdep); 1685 if (error) 1686 break; 1687 } 1688 if (lfpp) 1689 *lfpp = lfdep; 1690 } while (0); 1691 out: 1692 if (pathname) 1693 free(pathname, M_LINKER); 1694 return (error); 1695 } 1696 1697 /* 1698 * This routine is responsible for finding dependencies of userland initiated 1699 * kldload(2)'s of files. 1700 */ 1701 int 1702 linker_load_dependencies(linker_file_t lf) 1703 { 1704 linker_file_t lfdep; 1705 struct mod_metadata **start, **stop, **mdp, **nmdp; 1706 struct mod_metadata *mp, *nmp; 1707 struct mod_depend *verinfo; 1708 modlist_t mod; 1709 const char *modname, *nmodname; 1710 int ver, error = 0, count; 1711 1712 /* 1713 * All files are dependant on /kernel. 1714 */ 1715 if (linker_kernel_file) { 1716 linker_kernel_file->refs++; 1717 error = linker_file_add_dependency(lf, linker_kernel_file); 1718 if (error) 1719 return (error); 1720 } 1721 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 1722 &count) != 0) 1723 return (0); 1724 for (mdp = start; mdp < stop; mdp++) { 1725 mp = *mdp; 1726 if (mp->md_type != MDT_VERSION) 1727 continue; 1728 modname = mp->md_cval; 1729 ver = ((struct mod_version *)mp->md_data)->mv_version; 1730 mod = modlist_lookup(modname, ver); 1731 if (mod != NULL) { 1732 printf("interface %s.%d already present in the KLD" 1733 " '%s'!\n", modname, ver, 1734 mod->container->filename); 1735 return (EEXIST); 1736 } 1737 } 1738 1739 for (mdp = start; mdp < stop; mdp++) { 1740 mp = *mdp; 1741 if (mp->md_type != MDT_DEPEND) 1742 continue; 1743 modname = mp->md_cval; 1744 verinfo = mp->md_data; 1745 nmodname = NULL; 1746 for (nmdp = start; nmdp < stop; nmdp++) { 1747 nmp = *nmdp; 1748 if (nmp->md_type != MDT_VERSION) 1749 continue; 1750 nmodname = nmp->md_cval; 1751 if (strcmp(modname, nmodname) == 0) 1752 break; 1753 } 1754 if (nmdp < stop)/* early exit, it's a self reference */ 1755 continue; 1756 mod = modlist_lookup2(modname, verinfo); 1757 if (mod) { /* woohoo, it's loaded already */ 1758 lfdep = mod->container; 1759 lfdep->refs++; 1760 error = linker_file_add_dependency(lf, lfdep); 1761 if (error) 1762 break; 1763 continue; 1764 } 1765 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 1766 if (error) { 1767 printf("KLD %s: depends on %s - not available\n", 1768 lf->filename, modname); 1769 break; 1770 } 1771 } 1772 1773 if (error) 1774 return (error); 1775 linker_addmodules(lf, start, stop, 0); 1776 return (error); 1777 } 1778 1779 static int 1780 sysctl_kern_function_list_iterate(const char *name, void *opaque) 1781 { 1782 struct sysctl_req *req; 1783 1784 req = opaque; 1785 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 1786 } 1787 1788 /* 1789 * Export a nul-separated, double-nul-terminated list of all function names 1790 * in the kernel. 1791 */ 1792 static int 1793 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 1794 { 1795 linker_file_t lf; 1796 int error; 1797 1798 #ifdef MAC 1799 error = mac_check_kld_stat(req->td->td_ucred); 1800 if (error) 1801 return (error); 1802 #endif 1803 error = sysctl_wire_old_buffer(req, 0); 1804 if (error != 0) 1805 return (error); 1806 mtx_lock(&kld_mtx); 1807 TAILQ_FOREACH(lf, &linker_files, link) { 1808 error = LINKER_EACH_FUNCTION_NAME(lf, 1809 sysctl_kern_function_list_iterate, req); 1810 if (error) { 1811 mtx_unlock(&kld_mtx); 1812 return (error); 1813 } 1814 } 1815 mtx_unlock(&kld_mtx); 1816 return (SYSCTL_OUT(req, "", 1)); 1817 } 1818 1819 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD, 1820 NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 1821