1 /*- 2 * Copyright (c) 1997 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 * $FreeBSD: src/sys/kern/kern_linker.c,v 1.41.2.3 2001/11/21 17:50:35 luigi Exp $ 27 */ 28 29 #include "opt_ddb.h" 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 #include <sys/sysmsg.h> 36 #include <sys/sysent.h> 37 #include <sys/proc.h> 38 #include <sys/caps.h> 39 #include <sys/lock.h> 40 #include <sys/module.h> 41 #include <sys/queue.h> 42 #include <sys/linker.h> 43 #include <sys/fcntl.h> 44 #include <sys/libkern.h> 45 #include <sys/nlookup.h> 46 #include <sys/vnode.h> 47 #include <sys/sysctl.h> 48 49 #include <vm/vm_zone.h> 50 51 #ifdef _KERNEL_VIRTUAL 52 #include <dlfcn.h> 53 #endif 54 55 #ifdef KLD_DEBUG 56 int kld_debug = 1; 57 #endif 58 59 /* Metadata from the static kernel */ 60 SET_DECLARE(modmetadata_set, struct mod_metadata); 61 MALLOC_DEFINE(M_LINKER, "kld", "kernel linker"); 62 63 linker_file_t linker_current_file; 64 linker_file_t linker_kernel_file; 65 66 static struct lock llf_lock; /* lock for the file list */ 67 static struct lock kld_lock; 68 static linker_class_list_t classes; 69 static linker_file_list_t linker_files; 70 static int next_file_id = 1; 71 72 /* XXX wrong name; we're looking at version provision tags here, not modules */ 73 typedef TAILQ_HEAD(, modlist) modlisthead_t; 74 struct modlist { 75 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 76 linker_file_t container; 77 const char *name; 78 int version; 79 }; 80 typedef struct modlist *modlist_t; 81 static modlisthead_t found_modules; 82 83 84 static int linker_load_module(const char *kldname, const char *modname, 85 struct linker_file *parent, struct mod_depend *verinfo, 86 struct linker_file **lfpp); 87 88 static char * 89 linker_strdup(const char *str) 90 { 91 char *result; 92 93 result = kmalloc(strlen(str) + 1, M_LINKER, M_WAITOK); 94 strcpy(result, str); 95 return(result); 96 } 97 98 static const char * 99 linker_basename(const char *path) 100 { 101 const char *filename; 102 103 filename = strrchr(path, '/'); 104 if (filename == NULL) 105 return path; 106 if (filename[1]) 107 filename++; 108 return (filename); 109 } 110 111 static void 112 linker_init(void* arg) 113 { 114 lockinit(&llf_lock, "klink", 0, 0); 115 lockinit(&kld_lock, "kldlk", 0, LK_CANRECURSE); 116 TAILQ_INIT(&classes); 117 TAILQ_INIT(&linker_files); 118 } 119 120 SYSINIT(linker, SI_BOOT2_KLD, SI_ORDER_FIRST, linker_init, 0); 121 122 int 123 linker_add_class(const char* desc, void* priv, 124 struct linker_class_ops* ops) 125 { 126 linker_class_t lc; 127 128 lc = kmalloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT | M_ZERO); 129 if (!lc) 130 return ENOMEM; 131 132 lc->desc = desc; 133 lc->priv = priv; 134 lc->ops = ops; 135 TAILQ_INSERT_HEAD(&classes, lc, link); 136 137 return 0; 138 } 139 140 static void 141 linker_file_sysinit(linker_file_t lf) 142 { 143 struct sysinit** start, ** stop; 144 struct sysinit** sipp; 145 struct sysinit** xipp; 146 struct sysinit* save; 147 148 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 149 lf->filename)); 150 151 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 152 return; 153 154 /* 155 * Perform a bubble sort of the system initialization objects by 156 * their subsystem (primary key) and order (secondary key). 157 * 158 * Since some things care about execution order, this is the 159 * operation which ensures continued function. 160 */ 161 for (sipp = start; sipp < stop; sipp++) { 162 for (xipp = sipp + 1; xipp < stop; xipp++) { 163 if ((*sipp)->subsystem < (*xipp)->subsystem || 164 ((*sipp)->subsystem == (*xipp)->subsystem && 165 (*sipp)->order <= (*xipp)->order)) 166 continue; /* skip*/ 167 save = *sipp; 168 *sipp = *xipp; 169 *xipp = save; 170 } 171 } 172 173 174 /* 175 * Traverse the (now) ordered list of system initialization tasks. 176 * Perform each task, and continue on to the next task. 177 */ 178 for (sipp = start; sipp < stop; sipp++) { 179 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) 180 continue; /* skip dummy task(s)*/ 181 182 /* Call function */ 183 (*((*sipp)->func))((*sipp)->udata); 184 } 185 } 186 187 static void 188 linker_file_sysuninit(linker_file_t lf) 189 { 190 struct sysinit** start, ** stop; 191 struct sysinit** sipp; 192 struct sysinit** xipp; 193 struct sysinit* save; 194 195 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 196 lf->filename)); 197 198 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, NULL) != 0) 199 return; 200 201 /* 202 * Perform a reverse bubble sort of the system initialization objects 203 * by their subsystem (primary key) and order (secondary key). 204 * 205 * Since some things care about execution order, this is the 206 * operation which ensures continued function. 207 */ 208 for (sipp = start; sipp < stop; sipp++) { 209 for (xipp = sipp + 1; xipp < stop; xipp++) { 210 if ((*sipp)->subsystem > (*xipp)->subsystem || 211 ((*sipp)->subsystem == (*xipp)->subsystem && 212 (*sipp)->order >= (*xipp)->order)) 213 continue; /* skip*/ 214 save = *sipp; 215 *sipp = *xipp; 216 *xipp = save; 217 } 218 } 219 220 221 /* 222 * Traverse the (now) ordered list of system initialization tasks. 223 * Perform each task, and continue on to the next task. 224 */ 225 for (sipp = start; sipp < stop; sipp++) { 226 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) 227 continue; /* skip dummy task(s)*/ 228 229 /* Call function */ 230 (*((*sipp)->func))((*sipp)->udata); 231 } 232 } 233 234 static void 235 linker_file_register_sysctls(linker_file_t lf) 236 { 237 struct sysctl_oid **start, **stop, **oidp; 238 239 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 240 lf->filename)); 241 242 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 243 return; 244 for (oidp = start; oidp < stop; oidp++) 245 sysctl_register_oid(*oidp); 246 } 247 248 static void 249 linker_file_unregister_sysctls(linker_file_t lf) 250 { 251 struct sysctl_oid **start, **stop, **oidp; 252 253 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n", 254 lf->filename)); 255 256 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 257 return; 258 for (oidp = start; oidp < stop; oidp++) 259 sysctl_unregister_oid(*oidp); 260 } 261 262 static int 263 linker_file_register_modules(linker_file_t lf) 264 { 265 struct mod_metadata **start, **stop, **mdp; 266 const moduledata_t *moddata; 267 int first_error, error; 268 269 KLD_DPF(FILE, ("linker_file_register_modules: registering modules in %s\n", 270 lf->filename)); 271 272 if (linker_file_lookup_set(lf, "modmetadata_set", &start, &stop, NULL) != 0) { 273 /* 274 * This fallback should be unnecessary, but if we get booted 275 * from boot2 instead of loader and we are missing our 276 * metadata then we have to try the best we can. 277 */ 278 if (lf == linker_kernel_file) { 279 start = SET_BEGIN(modmetadata_set); 280 stop = SET_LIMIT(modmetadata_set); 281 } else 282 return (0); 283 } 284 first_error = 0; 285 for (mdp = start; mdp < stop; mdp++) { 286 if ((*mdp)->md_type != MDT_MODULE) 287 continue; 288 moddata = (*mdp)->md_data; 289 KLD_DPF(FILE, ("Registering module %s in %s\n", moddata->name, lf->filename)); 290 error = module_register(moddata, lf); 291 if (error) { 292 kprintf("Module %s failed to register: %d\n", moddata->name, error); 293 if (first_error == 0) 294 first_error = error; 295 } 296 } 297 return (first_error); 298 } 299 300 static void 301 linker_init_kernel_modules(void) 302 { 303 304 linker_file_register_modules(linker_kernel_file); 305 } 306 307 SYSINIT(linker_kernel, SI_BOOT2_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0); 308 309 int 310 linker_load_file(const char *filename, linker_file_t *result) 311 { 312 linker_class_t lc; 313 linker_file_t lf; 314 int foundfile, error = 0; 315 316 /* Refuse to load modules if securelevel raised */ 317 if (securelevel > 0 || kernel_mem_readonly) 318 return EPERM; 319 320 lf = linker_find_file_by_name(filename); 321 if (lf) { 322 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename)); 323 *result = lf; 324 lf->refs++; 325 goto out; 326 } 327 328 lf = NULL; 329 foundfile = 0; 330 TAILQ_FOREACH(lc, &classes, link) { 331 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n", 332 filename, lc->desc)); 333 334 error = lc->ops->load_file(filename, &lf); 335 /* 336 * If we got something other than ENOENT, then it exists but we cannot 337 * load it for some other reason. 338 */ 339 if (error != ENOENT) 340 foundfile = 1; 341 if (lf) { 342 error = linker_file_register_modules(lf); 343 if (error == EEXIST) { 344 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); 345 return (error); 346 } 347 linker_file_register_sysctls(lf); 348 linker_file_sysinit(lf); 349 lf->flags |= LINKER_FILE_LINKED; 350 *result = lf; 351 return (0); 352 } 353 } 354 /* 355 * Less than ideal, but tells the user whether it failed to load or 356 * the module was not found. 357 */ 358 if (foundfile) { 359 /* 360 * If the file type has not been recognized by the last try 361 * printout a message before to fail. 362 */ 363 if (error == ENOSYS) 364 kprintf("linker_load_file: Unsupported file type\n"); 365 366 /* 367 * Format not recognized or otherwise unloadable. 368 * When loading a module that is statically built into 369 * the kernel EEXIST percolates back up as the return 370 * value. Preserve this so that apps can recognize this 371 * special case. 372 */ 373 if (error != EEXIST) 374 error = ENOEXEC; 375 } else { 376 error = ENOENT; /* Nothing found */ 377 } 378 379 out: 380 return error; 381 } 382 383 384 linker_file_t 385 linker_find_file_by_name(const char* filename) 386 { 387 linker_file_t lf = NULL; 388 char *koname; 389 int i; 390 391 for (i = strlen(filename); i > 0 && filename[i-1] != '/'; --i) 392 ; 393 filename += i; 394 395 koname = kmalloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 396 ksprintf(koname, "%s.ko", filename); 397 398 lockmgr(&llf_lock, LK_SHARED); 399 TAILQ_FOREACH(lf, &linker_files, link) { 400 if (!strcmp(lf->filename, koname)) 401 break; 402 if (!strcmp(lf->filename, filename)) 403 break; 404 } 405 lockmgr(&llf_lock, LK_RELEASE); 406 407 if (koname) 408 kfree(koname, M_LINKER); 409 return lf; 410 } 411 412 linker_file_t 413 linker_find_file_by_id(int fileid) 414 { 415 linker_file_t lf = NULL; 416 417 lockmgr(&llf_lock, LK_SHARED); 418 TAILQ_FOREACH(lf, &linker_files, link) { 419 if (lf->id == fileid) 420 break; 421 } 422 lockmgr(&llf_lock, LK_RELEASE); 423 424 return lf; 425 } 426 427 int 428 linker_file_foreach(linker_predicate_t *predicate, void *context) 429 { 430 linker_file_t lf; 431 int retval = 0; 432 433 lockmgr(&llf_lock, LK_SHARED); 434 TAILQ_FOREACH(lf, &linker_files, link) { 435 retval = predicate(lf, context); 436 if (retval != 0) 437 break; 438 } 439 lockmgr(&llf_lock, LK_RELEASE); 440 441 return (retval); 442 } 443 444 linker_file_t 445 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops) 446 { 447 linker_file_t lf = NULL; 448 const char *filename; 449 450 filename = linker_basename(pathname); 451 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s, pathname=%s\n", 452 filename, pathname)); 453 454 lockmgr(&llf_lock, LK_EXCLUSIVE); 455 lf = kmalloc(sizeof(struct linker_file), M_LINKER, M_WAITOK | M_ZERO); 456 lf->refs = 1; 457 lf->userrefs = 0; 458 lf->flags = 0; 459 lf->filename = linker_strdup(filename); 460 lf->pathname = linker_strdup(pathname); 461 lf->id = next_file_id++; 462 lf->ndeps = 0; 463 lf->deps = NULL; 464 STAILQ_INIT(&lf->common); 465 TAILQ_INIT(&lf->modules); 466 467 lf->priv = priv; 468 lf->ops = ops; 469 TAILQ_INSERT_TAIL(&linker_files, lf, link); 470 471 lockmgr(&llf_lock, LK_RELEASE); 472 473 return lf; 474 } 475 476 int 477 linker_file_unload(linker_file_t file) 478 { 479 module_t mod, next; 480 modlist_t ml, nextml; 481 struct common_symbol* cp; 482 int error = 0; 483 int i; 484 485 /* Refuse to unload modules if securelevel raised */ 486 if (securelevel > 0 || kernel_mem_readonly) 487 return EPERM; 488 489 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 490 491 lockmgr(&llf_lock, LK_EXCLUSIVE); 492 493 /* Easy case of just dropping a reference. */ 494 if (file->refs > 1) { 495 file->refs--; 496 lockmgr(&llf_lock, LK_RELEASE); 497 return (0); 498 } 499 500 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n")); 501 502 /* 503 * Inform any modules associated with this file. 504 */ 505 mod = TAILQ_FIRST(&file->modules); 506 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 507 next = module_getfnext(mod); 508 509 /* 510 * Give the module a chance to veto the unload. Note that the 511 * act of unloading the module may cause other modules in the 512 * same file list to be unloaded recursively. 513 */ 514 if ((error = module_unload(mod)) != 0) { 515 KLD_DPF(FILE, ("linker_file_unload: module %p vetoes unload\n", 516 mod)); 517 lockmgr(&llf_lock, LK_RELEASE); 518 file->refs--; 519 goto out; 520 } 521 module_release(mod); 522 } 523 524 TAILQ_FOREACH_MUTABLE(ml, &found_modules, link, nextml) { 525 if (ml->container == file) { 526 TAILQ_REMOVE(&found_modules, ml, link); 527 kfree(ml, M_LINKER); 528 } 529 } 530 531 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */ 532 if (file->flags & LINKER_FILE_LINKED) { 533 file->flags &= ~LINKER_FILE_LINKED; 534 lockmgr(&llf_lock, LK_RELEASE); 535 linker_file_sysuninit(file); 536 linker_file_unregister_sysctls(file); 537 lockmgr(&llf_lock, LK_EXCLUSIVE); 538 } 539 540 TAILQ_REMOVE(&linker_files, file, link); 541 542 if (file->deps) { 543 lockmgr(&llf_lock, LK_RELEASE); 544 for (i = 0; i < file->ndeps; i++) 545 linker_file_unload(file->deps[i]); 546 lockmgr(&llf_lock, LK_EXCLUSIVE); 547 kfree(file->deps, M_LINKER); 548 file->deps = NULL; 549 } 550 551 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 552 STAILQ_REMOVE_HEAD(&file->common, link); 553 kfree(cp, M_LINKER); 554 } 555 556 file->ops->unload(file); 557 558 if (file->filename) { 559 kfree(file->filename, M_LINKER); 560 file->filename = NULL; 561 } 562 if (file->pathname) { 563 kfree(file->pathname, M_LINKER); 564 file->pathname = NULL; 565 } 566 567 kfree(file, M_LINKER); 568 569 lockmgr(&llf_lock, LK_RELEASE); 570 571 out: 572 return error; 573 } 574 575 void 576 linker_file_add_dependancy(linker_file_t file, linker_file_t dep) 577 { 578 linker_file_t* newdeps; 579 580 newdeps = kmalloc((file->ndeps + 1) * sizeof(linker_file_t*), 581 M_LINKER, M_WAITOK | M_ZERO); 582 583 if (file->deps) { 584 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*)); 585 kfree(file->deps, M_LINKER); 586 } 587 file->deps = newdeps; 588 file->deps[file->ndeps] = dep; 589 file->ndeps++; 590 } 591 592 /* 593 * Locate a linker set and its contents. 594 * This is a helper function to avoid linker_if.h exposure elsewhere. 595 * Note: firstp and lastp are really void *** 596 */ 597 int 598 linker_file_lookup_set(linker_file_t file, const char *name, 599 void *firstp, void *lastp, int *countp) 600 { 601 return file->ops->lookup_set(file, name, firstp, lastp, countp); 602 } 603 604 int 605 linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr) 606 { 607 c_linker_sym_t sym; 608 linker_symval_t symval; 609 linker_file_t lf; 610 size_t common_size = 0; 611 int i; 612 613 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 614 file, name, deps)); 615 616 if (file->ops->lookup_symbol(file, name, &sym) == 0) { 617 file->ops->symbol_values(file, sym, &symval); 618 619 /* 620 * XXX Assume a common symbol if its value is 0 and it has a non-zero 621 * size, otherwise it could be an absolute symbol with a value of 0. 622 */ 623 if (symval.value == NULL && symval.size != 0) { 624 /* 625 * For commons, first look them up in the dependancies and 626 * only allocate space if not found there. 627 */ 628 common_size = symval.size; 629 } else { 630 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%p\n", symval.value)); 631 *raddr = symval.value; 632 return 0; 633 } 634 } 635 if (deps) { 636 for (i = 0; i < file->ndeps; i++) { 637 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) { 638 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%p\n", *raddr)); 639 return 0; 640 } 641 } 642 643 /* If we have not found it in the dependencies, search globally */ 644 TAILQ_FOREACH(lf, &linker_files, link) { 645 /* But skip the current file if it's on the list */ 646 if (lf == file) 647 continue; 648 /* And skip the files we searched above */ 649 for (i = 0; i < file->ndeps; i++) 650 if (lf == file->deps[i]) 651 break; 652 if (i < file->ndeps) 653 continue; 654 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) { 655 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%p\n", *raddr)); 656 return 0; 657 } 658 } 659 } 660 661 if (common_size > 0) { 662 /* 663 * This is a common symbol which was not found in the 664 * dependancies. We maintain a simple common symbol table in 665 * the file object. 666 */ 667 struct common_symbol* cp; 668 669 STAILQ_FOREACH(cp, &file->common, link) 670 if (!strcmp(cp->name, name)) { 671 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%p\n", cp->address)); 672 *raddr = cp->address; 673 return 0; 674 } 675 676 /* 677 * Round the symbol size up to align. 678 */ 679 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 680 cp = kmalloc(sizeof(struct common_symbol) 681 + common_size 682 + strlen(name) + 1, 683 M_LINKER, M_WAITOK | M_ZERO); 684 685 cp->address = (caddr_t) (cp + 1); 686 cp->name = cp->address + common_size; 687 strcpy(cp->name, name); 688 bzero(cp->address, common_size); 689 STAILQ_INSERT_TAIL(&file->common, cp, link); 690 691 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%p\n", cp->address)); 692 *raddr = cp->address; 693 return 0; 694 } 695 696 #ifdef _KERNEL_VIRTUAL 697 *raddr = dlsym(RTLD_NEXT, name); 698 if (*raddr != NULL) { 699 KLD_DPF(SYM, ("linker_file_lookup_symbol: found dlsym=%p\n", *raddr)); 700 return 0; 701 } 702 #endif 703 704 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 705 return ENOENT; 706 } 707 708 #ifdef DDB 709 /* 710 * DDB Helpers. DDB has to look across multiple files with their own 711 * symbol tables and string tables. 712 * 713 * Note that we do not obey list locking protocols here. We really don't 714 * need DDB to hang because somebody's got the lock held. We'll take the 715 * chance that the files list is inconsistant instead. 716 */ 717 718 int 719 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 720 { 721 linker_file_t lf; 722 723 TAILQ_FOREACH(lf, &linker_files, link) { 724 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0) 725 return 0; 726 } 727 return ENOENT; 728 } 729 730 int 731 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 732 { 733 linker_file_t lf; 734 u_long off = (uintptr_t)value; 735 u_long diff, bestdiff; 736 c_linker_sym_t best; 737 c_linker_sym_t es; 738 739 best = NULL; 740 bestdiff = off; 741 TAILQ_FOREACH(lf, &linker_files, link) { 742 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0) 743 continue; 744 if (es != NULL && diff < bestdiff) { 745 best = es; 746 bestdiff = diff; 747 } 748 if (bestdiff == 0) 749 break; 750 } 751 if (best) { 752 *sym = best; 753 *diffp = bestdiff; 754 return 0; 755 } else { 756 *sym = NULL; 757 *diffp = off; 758 return ENOENT; 759 } 760 } 761 762 int 763 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 764 { 765 linker_file_t lf; 766 767 TAILQ_FOREACH(lf, &linker_files, link) { 768 if (lf->ops->symbol_values(lf, sym, symval) == 0) 769 return 0; 770 } 771 return ENOENT; 772 } 773 774 #endif 775 776 /* 777 * Syscalls. 778 * 779 * MPALMOSTSAFE 780 */ 781 int 782 sys_kldload(struct sysmsg *sysmsg, const struct kldload_args *uap) 783 { 784 char *file; 785 char *kldname, *modname; 786 linker_file_t lf; 787 int error = 0; 788 789 sysmsg->sysmsg_result = -1; 790 791 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ 792 return EPERM; 793 794 if ((error = caps_priv_check_self(SYSCAP_NOKLD)) != 0) 795 return error; 796 797 file = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 798 if ((error = copyinstr(uap->file, file, MAXPATHLEN, NULL)) != 0) 799 goto out; 800 801 /* 802 * If file does not contain a qualified name or any dot in it 803 * (kldname.ko, or kldname.ver.ko) treat it as an interface 804 * name. 805 */ 806 if (strchr(file, '/') || strchr(file, '.')) { 807 kldname = file; 808 modname = NULL; 809 } else { 810 kldname = NULL; 811 modname = file; 812 } 813 814 lockmgr(&kld_lock, LK_EXCLUSIVE); 815 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 816 lockmgr(&kld_lock, LK_RELEASE); 817 if (error) 818 goto out; 819 820 lf->userrefs++; 821 sysmsg->sysmsg_result = lf->id; 822 823 out: 824 if (file) 825 kfree(file, M_TEMP); 826 return error; 827 } 828 829 /* 830 * MPALMOSTSAFE 831 */ 832 int 833 sys_kldunload(struct sysmsg *sysmsg, const struct kldunload_args *uap) 834 { 835 linker_file_t lf; 836 int error = 0; 837 838 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ 839 return EPERM; 840 841 if ((error = caps_priv_check_self(SYSCAP_NOKLD)) != 0) 842 return error; 843 844 lockmgr(&kld_lock, LK_EXCLUSIVE); 845 lf = linker_find_file_by_id(uap->fileid); 846 if (lf) { 847 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 848 if (lf->userrefs == 0) { 849 kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n"); 850 error = EBUSY; 851 goto out; 852 } 853 lf->userrefs--; 854 error = linker_file_unload(lf); 855 if (error) 856 lf->userrefs++; 857 } else { 858 error = ENOENT; 859 } 860 out: 861 lockmgr(&kld_lock, LK_RELEASE); 862 863 return error; 864 } 865 866 /* 867 * MPALMOSTSAFE 868 */ 869 int 870 sys_kldfind(struct sysmsg *sysmsg, const struct kldfind_args *uap) 871 { 872 char *pathname; 873 const char *filename; 874 linker_file_t lf; 875 int error; 876 877 sysmsg->sysmsg_result = -1; 878 879 pathname = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 880 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 881 goto out; 882 883 filename = linker_basename(pathname); 884 885 lockmgr(&kld_lock, LK_EXCLUSIVE); 886 lf = linker_find_file_by_name(filename); 887 if (lf) 888 sysmsg->sysmsg_result = lf->id; 889 else 890 error = ENOENT; 891 lockmgr(&kld_lock, LK_RELEASE); 892 893 out: 894 if (pathname) 895 kfree(pathname, M_TEMP); 896 return error; 897 } 898 899 /* 900 * MPALMOSTSAFE 901 */ 902 int 903 sys_kldnext(struct sysmsg *sysmsg, const struct kldnext_args *uap) 904 { 905 linker_file_t lf; 906 int error = 0; 907 908 lockmgr(&kld_lock, LK_EXCLUSIVE); 909 if (uap->fileid == 0) { 910 lf = TAILQ_FIRST(&linker_files); 911 } else { 912 lf = linker_find_file_by_id(uap->fileid); 913 if (lf == NULL) { 914 error = ENOENT; 915 goto out; 916 } 917 lf = TAILQ_NEXT(lf, link); 918 } 919 920 /* Skip partially loaded files. */ 921 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) { 922 lf = TAILQ_NEXT(lf, link); 923 } 924 925 if (lf) 926 sysmsg->sysmsg_result = lf->id; 927 else 928 sysmsg->sysmsg_result = 0; 929 930 out: 931 lockmgr(&kld_lock, LK_RELEASE); 932 933 return error; 934 } 935 936 /* 937 * MPALMOSTSAFE 938 */ 939 int 940 sys_kldstat(struct sysmsg *sysmsg, const struct kldstat_args *uap) 941 { 942 linker_file_t lf; 943 int error = 0; 944 int version; 945 struct kld_file_stat* stat; 946 int namelen; 947 948 lockmgr(&kld_lock, LK_EXCLUSIVE); 949 lf = linker_find_file_by_id(uap->fileid); 950 if (!lf) { 951 error = ENOENT; 952 goto out; 953 } 954 955 stat = uap->stat; 956 957 /* 958 * Check the version of the user's structure. 959 */ 960 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 961 goto out; 962 if (version != sizeof(struct kld_file_stat)) { 963 error = EINVAL; 964 goto out; 965 } 966 967 namelen = strlen(lf->filename) + 1; 968 if (namelen > MAXPATHLEN) 969 namelen = MAXPATHLEN; 970 if ((error = copyout(lf->filename, stat->name, namelen)) != 0) 971 goto out; 972 973 namelen = strlen(lf->pathname) + 1; 974 if (namelen > MAXPATHLEN) 975 namelen = MAXPATHLEN; 976 if ((error = copyout(lf->pathname, stat->pathname, namelen)) != 0) 977 goto out; 978 979 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 980 goto out; 981 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 982 goto out; 983 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) 984 goto out; 985 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 986 goto out; 987 988 sysmsg->sysmsg_result = 0; 989 990 out: 991 lockmgr(&kld_lock, LK_RELEASE); 992 993 return error; 994 } 995 996 /* 997 * MPALMOSTSAFE 998 */ 999 int 1000 sys_kldfirstmod(struct sysmsg *sysmsg, const struct kldfirstmod_args *uap) 1001 { 1002 linker_file_t lf; 1003 int error = 0; 1004 1005 lockmgr(&kld_lock, LK_EXCLUSIVE); 1006 lf = linker_find_file_by_id(uap->fileid); 1007 if (lf) { 1008 if (TAILQ_FIRST(&lf->modules)) 1009 sysmsg->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules)); 1010 else 1011 sysmsg->sysmsg_result = 0; 1012 } else { 1013 error = ENOENT; 1014 } 1015 lockmgr(&kld_lock, LK_RELEASE); 1016 1017 return error; 1018 } 1019 1020 /* 1021 * MPALMOSTSAFE 1022 */ 1023 int 1024 sys_kldsym(struct sysmsg *sysmsg, const struct kldsym_args *uap) 1025 { 1026 char *symstr = NULL; 1027 c_linker_sym_t sym; 1028 linker_symval_t symval; 1029 linker_file_t lf; 1030 struct kld_sym_lookup lookup; 1031 int error = 0; 1032 1033 lockmgr(&kld_lock, LK_EXCLUSIVE); 1034 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1035 goto out; 1036 if (lookup.version != sizeof(lookup) || uap->cmd != KLDSYM_LOOKUP) { 1037 error = EINVAL; 1038 goto out; 1039 } 1040 1041 symstr = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1042 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1043 goto out; 1044 1045 if (uap->fileid != 0) { 1046 lf = linker_find_file_by_id(uap->fileid); 1047 if (lf == NULL) { 1048 error = ENOENT; 1049 goto out; 1050 } 1051 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1052 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1053 lookup.symvalue = (uintptr_t)symval.value; 1054 lookup.symsize = symval.size; 1055 error = copyout(&lookup, uap->data, sizeof(lookup)); 1056 } else 1057 error = ENOENT; 1058 } else { 1059 TAILQ_FOREACH(lf, &linker_files, link) { 1060 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1061 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1062 lookup.symvalue = (uintptr_t)symval.value; 1063 lookup.symsize = symval.size; 1064 error = copyout(&lookup, uap->data, sizeof(lookup)); 1065 break; 1066 } 1067 } 1068 if (!lf) 1069 error = ENOENT; 1070 } 1071 out: 1072 lockmgr(&kld_lock, LK_RELEASE); 1073 if (symstr) 1074 kfree(symstr, M_TEMP); 1075 1076 return error; 1077 } 1078 1079 /* 1080 * Preloaded module support 1081 */ 1082 1083 static modlist_t 1084 modlist_lookup(const char *name, int ver) 1085 { 1086 modlist_t mod; 1087 1088 TAILQ_FOREACH(mod, &found_modules, link) { 1089 if (strcmp(mod->name, name) == 0 && (ver == 0 || mod->version == ver)) 1090 return (mod); 1091 } 1092 return (NULL); 1093 } 1094 1095 static modlist_t 1096 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1097 { 1098 modlist_t mod, bestmod; 1099 int ver; 1100 1101 if (verinfo == NULL) 1102 return (modlist_lookup(name, 0)); 1103 bestmod = NULL; 1104 TAILQ_FOREACH(mod, &found_modules, link) { 1105 if (strcmp(mod->name, name) != 0) 1106 continue; 1107 ver = mod->version; 1108 if (ver == verinfo->md_ver_preferred) 1109 return (mod); 1110 if (ver >= verinfo->md_ver_minimum && 1111 ver <= verinfo->md_ver_maximum && 1112 (bestmod == NULL || ver > bestmod->version)) 1113 bestmod = mod; 1114 } 1115 return (bestmod); 1116 } 1117 1118 int 1119 linker_reference_module(const char *modname, struct mod_depend *verinfo, 1120 linker_file_t *result) 1121 { 1122 modlist_t mod; 1123 int error; 1124 1125 lockmgr(&llf_lock, LK_SHARED); 1126 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 1127 *result = mod->container; 1128 (*result)->refs++; 1129 lockmgr(&llf_lock, LK_RELEASE); 1130 return (0); 1131 } 1132 1133 lockmgr(&llf_lock, LK_RELEASE); 1134 /*lockmgr(&kld_lock, LK_EXCLUSIVE);*/ 1135 error = linker_load_module(NULL, modname, NULL, verinfo, result); 1136 /*lockmgr(&kld_lock, LK_RELEASE);*/ 1137 1138 return (error); 1139 } 1140 1141 int 1142 linker_release_module(const char *modname, struct mod_depend *verinfo, 1143 linker_file_t lf) 1144 { 1145 modlist_t mod; 1146 int error; 1147 1148 lockmgr(&llf_lock, LK_SHARED); 1149 if (lf == NULL) { 1150 KASSERT(modname != NULL, 1151 ("linker_release_module: no file or name")); 1152 mod = modlist_lookup2(modname, verinfo); 1153 if (mod == NULL) { 1154 lockmgr(&llf_lock, LK_RELEASE); 1155 return (ESRCH); 1156 } 1157 lf = mod->container; 1158 } else 1159 KASSERT(modname == NULL && verinfo == NULL, 1160 ("linker_release_module: both file and name")); 1161 lockmgr(&llf_lock, LK_RELEASE); 1162 /*lockmgr(&kld_lock, LK_EXCLUSIVE);*/ 1163 error = linker_file_unload(lf); 1164 /*lockmgr(&kld_lock, LK_RELEASE);*/ 1165 1166 return (error); 1167 } 1168 1169 static modlist_t 1170 modlist_newmodule(const char *modname, int version, linker_file_t container) 1171 { 1172 modlist_t mod; 1173 1174 mod = kmalloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1175 if (mod == NULL) 1176 panic("no memory for module list"); 1177 mod->container = container; 1178 mod->name = modname; 1179 mod->version = version; 1180 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1181 return (mod); 1182 } 1183 1184 static void 1185 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1186 struct mod_metadata **stop, int preload) 1187 { 1188 struct mod_metadata *mp, **mdp; 1189 const char *modname; 1190 int ver; 1191 1192 for (mdp = start; mdp < stop; mdp++) { 1193 mp = *mdp; 1194 if (mp->md_type != MDT_VERSION) 1195 continue; 1196 modname = mp->md_cval; 1197 ver = ((struct mod_version *)mp->md_data)->mv_version; 1198 if (modlist_lookup(modname, ver) != NULL) { 1199 kprintf("module %s already present!\n", modname); 1200 /* XXX what can we do? this is a build error. :-( */ 1201 continue; 1202 } 1203 modlist_newmodule(modname, ver, lf); 1204 } 1205 } 1206 1207 static void 1208 linker_preload(void* arg) 1209 { 1210 caddr_t modptr; 1211 const char *modname, *nmodname; 1212 char *modtype; 1213 linker_file_t lf, nlf; 1214 linker_class_t lc; 1215 int error; 1216 linker_file_list_t loaded_files; 1217 linker_file_list_t depended_files; 1218 struct mod_metadata *mp, *nmp; 1219 struct mod_metadata **start, **stop, **mdp, **nmdp; 1220 struct mod_depend *verinfo; 1221 int nver; 1222 int resolves; 1223 modlist_t mod; 1224 struct sysinit **si_start, **si_stop; 1225 1226 TAILQ_INIT(&loaded_files); 1227 TAILQ_INIT(&depended_files); 1228 TAILQ_INIT(&found_modules); 1229 1230 modptr = NULL; 1231 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1232 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1233 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1234 if (modname == NULL) { 1235 kprintf("Preloaded module at %p does not have a name!\n", modptr); 1236 continue; 1237 } 1238 if (modtype == NULL) { 1239 kprintf("Preloaded module at %p does not have a type!\n", modptr); 1240 continue; 1241 } 1242 1243 if (bootverbose) 1244 kprintf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); 1245 lf = NULL; 1246 TAILQ_FOREACH(lc, &classes, link) { 1247 error = lc->ops->preload_file(modname, &lf); 1248 if (!error) 1249 break; 1250 lf = NULL; 1251 } 1252 if (lf) 1253 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1254 } 1255 1256 /* 1257 * First get a list of stuff in the kernel. 1258 */ 1259 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1260 &stop, NULL) == 0) 1261 linker_addmodules(linker_kernel_file, start, stop, 1); 1262 1263 /* 1264 * This is a once-off kinky bubble sort to resolve relocation 1265 * dependency requirements. 1266 */ 1267 restart: 1268 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1269 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1270 /* 1271 * First, look to see if we would successfully link with this 1272 * stuff. 1273 */ 1274 resolves = 1; /* unless we know otherwise */ 1275 if (!error) { 1276 for (mdp = start; mdp < stop; mdp++) { 1277 mp = *mdp; 1278 if (mp->md_type != MDT_DEPEND) 1279 continue; 1280 modname = mp->md_cval; 1281 verinfo = mp->md_data; 1282 for (nmdp = start; nmdp < stop; nmdp++) { 1283 nmp = *nmdp; 1284 if (nmp->md_type != MDT_VERSION) 1285 continue; 1286 nmodname = nmp->md_cval; 1287 if (strcmp(modname, nmodname) == 0) 1288 break; 1289 } 1290 if (nmdp < stop)/* it's a self reference */ 1291 continue; 1292 1293 /* 1294 * ok, the module isn't here yet, we 1295 * are not finished 1296 */ 1297 if (modlist_lookup2(modname, verinfo) == NULL) 1298 resolves = 0; 1299 } 1300 } 1301 /* 1302 * OK, if we found our modules, we can link. So, "provide" 1303 * the modules inside and add it to the end of the link order 1304 * list. 1305 */ 1306 if (resolves) { 1307 if (!error) { 1308 for (mdp = start; mdp < stop; mdp++) { 1309 mp = *mdp; 1310 if (mp->md_type != MDT_VERSION) 1311 continue; 1312 modname = mp->md_cval; 1313 nver = ((struct mod_version *)mp->md_data)->mv_version; 1314 if (modlist_lookup(modname, nver) != NULL) { 1315 kprintf("module %s already present!\n", modname); 1316 TAILQ_REMOVE(&loaded_files, lf, loaded); 1317 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1318 /* we changed tailq next ptr */ 1319 goto restart; 1320 } 1321 modlist_newmodule(modname, nver, lf); 1322 } 1323 } 1324 TAILQ_REMOVE(&loaded_files, lf, loaded); 1325 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1326 /* 1327 * Since we provided modules, we need to restart the 1328 * sort so that the previous files that depend on us 1329 * have a chance. Also, we've busted the tailq next 1330 * pointer with the REMOVE. 1331 */ 1332 goto restart; 1333 } 1334 } 1335 1336 /* 1337 * At this point, we check to see what could not be resolved.. 1338 */ 1339 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1340 TAILQ_REMOVE(&loaded_files, lf, loaded); 1341 kprintf("KLD file %s is missing dependencies\n", lf->filename); 1342 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1343 } 1344 1345 /* 1346 * We made it. Finish off the linking in the order we determined. 1347 */ 1348 TAILQ_FOREACH_MUTABLE(lf, &depended_files, loaded, nlf) { 1349 if (linker_kernel_file) { 1350 linker_kernel_file->refs++; 1351 linker_file_add_dependancy(lf, linker_kernel_file); 1352 } 1353 lf->userrefs++; 1354 1355 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1356 if (!error) { 1357 for (mdp = start; mdp < stop; mdp++) { 1358 mp = *mdp; 1359 if (mp->md_type != MDT_DEPEND) 1360 continue; 1361 modname = mp->md_cval; 1362 verinfo = mp->md_data; 1363 mod = modlist_lookup2(modname, verinfo); 1364 /* Don't count self-dependencies */ 1365 if (lf == mod->container) 1366 continue; 1367 mod->container->refs++; 1368 linker_file_add_dependancy(lf, mod->container); 1369 } 1370 } 1371 /* 1372 * Now do relocation etc using the symbol search paths 1373 * established by the dependencies 1374 */ 1375 error = lf->ops->preload_finish(lf); 1376 if (error) { 1377 TAILQ_REMOVE(&depended_files, lf, loaded); 1378 kprintf("KLD file %s - could not finalize loading\n", 1379 lf->filename); 1380 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); 1381 continue; 1382 } 1383 linker_file_register_modules(lf); 1384 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) 1385 sysinit_add(si_start, si_stop); 1386 linker_file_register_sysctls(lf); 1387 lf->flags |= LINKER_FILE_LINKED; 1388 } 1389 /* woohoo! we made it! */ 1390 } 1391 1392 SYSINIT(preload, SI_BOOT2_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1393 1394 /* 1395 * Search for a not-loaded module by name. 1396 * 1397 * Modules may be found in the following locations: 1398 * 1399 * - preloaded (result is just the module name) 1400 * - on disk (result is full path to module) 1401 * 1402 * The search path can be manipulated via sysctl. Note that we use the ';' 1403 * character as a separator to be consistent with the bootloader. 1404 */ 1405 1406 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules.local"; 1407 1408 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1409 sizeof(linker_path), "module load search path"); 1410 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1411 1412 char * 1413 linker_search_path(const char *name) 1414 { 1415 struct nlookupdata nd; 1416 char *cp, *ep, *result; 1417 char *buf, *retbuf, *freebuf; 1418 size_t name_len, prefix_len; 1419 size_t result_len; 1420 int sep; 1421 int error; 1422 enum vtype type; 1423 const char *exts[] = { "", ".ko", NULL }; 1424 const char **ext; 1425 1426 /* already full path */ 1427 if (name[0] == '/') 1428 return linker_strdup(name); 1429 1430 /* resolve to full path */ 1431 if (strchr(name, '/') != NULL) { 1432 result = NULL; 1433 1434 /* adapted from sys___realpath() */ 1435 error = nlookup_init(&nd, name, UIO_SYSSPACE, NLC_FOLLOW); 1436 if (error == 0) { 1437 nd.nl_flags |= NLC_SHAREDLOCK; 1438 error = nlookup(&nd); 1439 } 1440 if (error == 0) { 1441 if (nd.nl_flags & NLC_NCPISLOCKED) { 1442 nd.nl_flags &= ~NLC_NCPISLOCKED; 1443 cache_unlock(&nd.nl_nch); 1444 } 1445 error = cache_fullpath(curproc, &nd.nl_nch, NULL, 1446 &retbuf, &freebuf, 0); 1447 if (error == 0) { 1448 result = linker_strdup(retbuf); 1449 kfree(freebuf, M_TEMP); 1450 } 1451 } 1452 nlookup_done(&nd); 1453 1454 return (result); 1455 } 1456 1457 /* traverse the linker path */ 1458 buf = kmalloc(MAXPATHLEN, M_LINKER, M_WAITOK); 1459 cp = linker_path; 1460 name_len = strlen(name); 1461 for (;;) { 1462 /* find the end of this component */ 1463 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) 1464 ; 1465 prefix_len = ep - cp; 1466 /* if this component doesn't end with a slash, add one */ 1467 if (ep == cp || *(ep - 1) != '/') 1468 sep = 1; 1469 else 1470 sep = 0; 1471 1472 result = buf; 1473 strncpy(result, cp, prefix_len); 1474 if (sep) 1475 result[prefix_len++] = '/'; 1476 strcpy(result + prefix_len, name); 1477 1478 result_len = strlen(result); 1479 for (ext = exts; *ext != NULL; ext++) { 1480 strcpy(result + result_len, *ext); 1481 1482 /* 1483 * Attempt to open the file, and return the path if we succeed and it's 1484 * a regular file. 1485 */ 1486 error = nlookup_init(&nd, result, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP); 1487 if (error == 0) 1488 error = vn_open(&nd, NULL, FREAD, 0); 1489 if (error == 0) { 1490 type = nd.nl_open_vp->v_type; 1491 if (type == VREG) { 1492 nlookup_done(&nd); 1493 return (result); 1494 } 1495 } 1496 nlookup_done(&nd); 1497 } 1498 1499 if (*ep == 0) 1500 break; 1501 cp = ep + 1; 1502 } 1503 1504 kfree(buf, M_LINKER); 1505 return(NULL); 1506 } 1507 1508 /* 1509 * Find a file which contains given module and load it, if "parent" is not 1510 * NULL, register a reference to it. 1511 */ 1512 static int 1513 linker_load_module(const char *kldname, const char *modname, 1514 struct linker_file *parent, struct mod_depend *verinfo, 1515 struct linker_file **lfpp) 1516 { 1517 linker_file_t lfdep; 1518 const char *filename; 1519 char *pathname; 1520 int error; 1521 1522 if (modname == NULL) { 1523 /* 1524 * We have to load KLD 1525 */ 1526 KASSERT(verinfo == NULL, ("linker_load_module: verinfo is not NULL")); 1527 pathname = linker_search_path(kldname); 1528 } else { 1529 if (modlist_lookup2(modname, verinfo) != NULL) 1530 return (EEXIST); 1531 if (kldname != NULL) { 1532 pathname = linker_strdup(kldname); 1533 } else if (rootvnode == NULL) { 1534 pathname = NULL; 1535 } else { 1536 pathname = linker_search_path(modname); 1537 } 1538 #if 0 1539 /* 1540 * Need to find a KLD with required module 1541 */ 1542 pathname = linker_search_module(modname, 1543 strlen(modname), verinfo); 1544 #endif 1545 } 1546 if (pathname == NULL) 1547 return (ENOENT); 1548 1549 /* 1550 * Can't load more than one file with the same basename XXX: 1551 * Actually it should be possible to have multiple KLDs with 1552 * the same basename but different path because they can 1553 * provide different versions of the same modules. 1554 */ 1555 filename = linker_basename(pathname); 1556 if (linker_find_file_by_name(filename)) 1557 error = EEXIST; 1558 else 1559 do { 1560 error = linker_load_file(pathname, &lfdep); 1561 if (error) 1562 break; 1563 if (modname && verinfo && modlist_lookup2(modname, verinfo) == NULL) { 1564 linker_file_unload(lfdep /* , LINKER_UNLOAD_FORCE */ ); 1565 error = ENOENT; 1566 break; 1567 } 1568 if (parent) { 1569 linker_file_add_dependancy(parent, lfdep); 1570 } 1571 if (lfpp) 1572 *lfpp = lfdep; 1573 } while (0); 1574 kfree(pathname, M_LINKER); 1575 return (error); 1576 } 1577 1578 /* 1579 * This routine is responsible for finding dependencies of userland initiated 1580 * kldload(2)'s of files. 1581 */ 1582 int 1583 linker_load_dependencies(linker_file_t lf) 1584 { 1585 linker_file_t lfdep; 1586 struct mod_metadata **start, **stop, **mdp, **nmdp; 1587 struct mod_metadata *mp, *nmp; 1588 struct mod_depend *verinfo; 1589 modlist_t mod; 1590 const char *modname, *nmodname; 1591 int ver, error = 0, count; 1592 1593 /* 1594 * All files are dependant on /kernel. 1595 */ 1596 if (linker_kernel_file) { 1597 linker_kernel_file->refs++; 1598 linker_file_add_dependancy(lf, linker_kernel_file); 1599 } 1600 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, &count) != 0) 1601 return (0); 1602 for (mdp = start; mdp < stop; mdp++) { 1603 mp = *mdp; 1604 if (mp->md_type != MDT_VERSION) 1605 continue; 1606 modname = mp->md_cval; 1607 ver = ((struct mod_version *)mp->md_data)->mv_version; 1608 mod = modlist_lookup(modname, ver); 1609 if (mod != NULL) { 1610 kprintf("interface %s.%d already present in the KLD '%s'!\n", 1611 modname, ver, mod->container->filename); 1612 return (EEXIST); 1613 } 1614 } 1615 1616 for (mdp = start; mdp < stop; mdp++) { 1617 mp = *mdp; 1618 if (mp->md_type != MDT_DEPEND) 1619 continue; 1620 modname = mp->md_cval; 1621 verinfo = mp->md_data; 1622 nmodname = NULL; 1623 for (nmdp = start; nmdp < stop; nmdp++) { 1624 nmp = *nmdp; 1625 if (nmp->md_type != MDT_VERSION) 1626 continue; 1627 nmodname = nmp->md_cval; 1628 if (strcmp(modname, nmodname) == 0) 1629 break; 1630 } 1631 if (nmdp < stop) /* early exit, it's a self reference */ 1632 continue; 1633 mod = modlist_lookup2(modname, verinfo); 1634 if (mod) { /* woohoo, it's loaded already */ 1635 lfdep = mod->container; 1636 lfdep->refs++; 1637 linker_file_add_dependancy(lf, lfdep); 1638 continue; 1639 } 1640 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 1641 if (error) { 1642 kprintf("KLD %s: depends on %s - not available or version mismatch\n", 1643 lf->filename, modname); 1644 break; 1645 } 1646 } 1647 1648 if (error) 1649 return (error); 1650 linker_addmodules(lf, start, stop, 0); 1651 return (0); 1652 } 1653