kern_linker.c revision 92016
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 * $FreeBSD: head/sys/kern/kern_linker.c 92016 2002-03-10 19:20:01Z sobomax $ 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/sysproto.h> 36#include <sys/sysent.h> 37#include <sys/proc.h> 38#include <sys/lock.h> 39#include <sys/mutex.h> 40#include <sys/module.h> 41#include <sys/linker.h> 42#include <sys/fcntl.h> 43#include <sys/libkern.h> 44#include <sys/namei.h> 45#include <sys/vnode.h> 46#include <sys/sysctl.h> 47 48 49#include "linker_if.h" 50 51#ifdef KLD_DEBUG 52int kld_debug = 0; 53#endif 54 55/* 56 * static char *linker_search_path(const char *name, struct mod_depend 57 * *verinfo); 58 */ 59static const char *linker_basename(const char *path); 60static int linker_load_module(const char *kldname, const char *modname, 61 struct linker_file *parent, struct mod_depend *verinfo, 62 struct linker_file **lfpp); 63 64/* Metadata from the static kernel */ 65SET_DECLARE(modmetadata_set, struct mod_metadata); 66 67MALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 68 69linker_file_t linker_kernel_file; 70 71static struct lock lock; /* lock for the file list */ 72static linker_class_list_t classes; 73static linker_file_list_t linker_files; 74static int next_file_id = 1; 75 76#define LINKER_GET_NEXT_FILE_ID(a) do { \ 77 linker_file_t lftmp; \ 78 \ 79retry: \ 80 TAILQ_FOREACH(lftmp, &linker_files, link) { \ 81 if (next_file_id == lftmp->id) { \ 82 next_file_id++; \ 83 goto retry; \ 84 } \ 85 } \ 86 (a) = next_file_id; \ 87} while(0) 88 89 90/* XXX wrong name; we're looking at version provision tags here, not modules */ 91typedef TAILQ_HEAD(, modlist) modlisthead_t; 92struct modlist { 93 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 94 linker_file_t container; 95 const char *name; 96 int version; 97}; 98typedef struct modlist *modlist_t; 99static modlisthead_t found_modules; 100 101static char * 102linker_strdup(const char *str) 103{ 104 char *result; 105 106 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 107 strcpy(result, str); 108 return (result); 109} 110 111static void 112linker_init(void *arg) 113{ 114 115 lockinit(&lock, PVM, "klink", 0, 0); 116 TAILQ_INIT(&classes); 117 TAILQ_INIT(&linker_files); 118} 119 120SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0) 121 122int 123linker_add_class(linker_class_t lc) 124{ 125 126 kobj_class_compile((kobj_class_t) lc); 127 TAILQ_INSERT_TAIL(&classes, lc, link); 128 return (0); 129} 130 131static void 132linker_file_sysinit(linker_file_t lf) 133{ 134 struct sysinit **start, **stop, **sipp, **xipp, *save; 135 136 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 137 lf->filename)); 138 139 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 140 return; 141 /* 142 * Perform a bubble sort of the system initialization objects by 143 * their subsystem (primary key) and order (secondary key). 144 * 145 * Since some things care about execution order, this is the operation 146 * which ensures continued function. 147 */ 148 for (sipp = start; sipp < stop; sipp++) { 149 for (xipp = sipp + 1; xipp < stop; xipp++) { 150 if ((*sipp)->subsystem < (*xipp)->subsystem || 151 ((*sipp)->subsystem == (*xipp)->subsystem && 152 (*sipp)->order <= (*xipp)->order)) 153 continue; /* skip */ 154 save = *sipp; 155 *sipp = *xipp; 156 *xipp = save; 157 } 158 } 159 160 /* 161 * Traverse the (now) ordered list of system initialization tasks. 162 * Perform each task, and continue on to the next task. 163 */ 164 for (sipp = start; sipp < stop; sipp++) { 165 if ((*sipp)->subsystem == SI_SUB_DUMMY) 166 continue; /* skip dummy task(s) */ 167 168 /* Call function */ 169 (*((*sipp)->func)) ((*sipp)->udata); 170 } 171} 172 173static void 174linker_file_sysuninit(linker_file_t lf) 175{ 176 struct sysinit **start, **stop, **sipp, **xipp, *save; 177 178 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 179 lf->filename)); 180 181 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 182 NULL) != 0) 183 return; 184 185 /* 186 * Perform a reverse bubble sort of the system initialization objects 187 * by their subsystem (primary key) and order (secondary key). 188 * 189 * Since some things care about execution order, this is the operation 190 * which ensures continued function. 191 */ 192 for (sipp = start; sipp < stop; sipp++) { 193 for (xipp = sipp + 1; xipp < stop; xipp++) { 194 if ((*sipp)->subsystem > (*xipp)->subsystem || 195 ((*sipp)->subsystem == (*xipp)->subsystem && 196 (*sipp)->order >= (*xipp)->order)) 197 continue; /* skip */ 198 save = *sipp; 199 *sipp = *xipp; 200 *xipp = save; 201 } 202 } 203 204 /* 205 * Traverse the (now) ordered list of system initialization tasks. 206 * Perform each task, and continue on to the next task. 207 */ 208 for (sipp = start; sipp < stop; sipp++) { 209 if ((*sipp)->subsystem == SI_SUB_DUMMY) 210 continue; /* skip dummy task(s) */ 211 212 /* Call function */ 213 (*((*sipp)->func)) ((*sipp)->udata); 214 } 215} 216 217static void 218linker_file_register_sysctls(linker_file_t lf) 219{ 220 struct sysctl_oid **start, **stop, **oidp; 221 222 KLD_DPF(FILE, 223 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 224 lf->filename)); 225 226 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 227 return; 228 229 for (oidp = start; oidp < stop; oidp++) 230 sysctl_register_oid(*oidp); 231} 232 233static void 234linker_file_unregister_sysctls(linker_file_t lf) 235{ 236 struct sysctl_oid **start, **stop, **oidp; 237 238 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs" 239 " for %s\n", lf->filename)); 240 241 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 242 return; 243 244 for (oidp = start; oidp < stop; oidp++) 245 sysctl_unregister_oid(*oidp); 246} 247 248static int 249linker_file_register_modules(linker_file_t lf) 250{ 251 struct mod_metadata **start, **stop, **mdp; 252 const moduledata_t *moddata; 253 int error; 254 255 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 256 " in %s\n", lf->filename)); 257 258 if (linker_file_lookup_set(lf, "modmetadata_set", &start, 259 &stop, 0) != 0) { 260 /* 261 * This fallback should be unnecessary, but if we get booted 262 * from boot2 instead of loader and we are missing our 263 * metadata then we have to try the best we can. 264 */ 265 if (lf == linker_kernel_file) { 266 start = SET_BEGIN(modmetadata_set); 267 stop = SET_LIMIT(modmetadata_set); 268 } else 269 return (0); 270 } 271 for (mdp = start; mdp < stop; mdp++) { 272 if ((*mdp)->md_type != MDT_MODULE) 273 continue; 274 moddata = (*mdp)->md_data; 275 KLD_DPF(FILE, ("Registering module %s in %s\n", 276 moddata->name, lf->filename)); 277 if (module_lookupbyname(moddata->name) != NULL) { 278 printf("Warning: module %s already exists\n", 279 moddata->name); 280 continue; /* or return a error ? */ 281 } 282 error = module_register(moddata, lf); 283 if (error) 284 printf("Module %s failed to register: %d\n", 285 moddata->name, error); 286 } 287 return (0); 288} 289 290static void 291linker_init_kernel_modules(void) 292{ 293 294 linker_file_register_modules(linker_kernel_file); 295} 296 297SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0) 298 299int 300linker_load_file(const char *filename, linker_file_t *result) 301{ 302 linker_class_t lc; 303 linker_file_t lf; 304 int foundfile, error = 0; 305 306 /* Refuse to load modules if securelevel raised */ 307 if (securelevel > 0) 308 return (EPERM); 309 310 lf = linker_find_file_by_name(filename); 311 if (lf) { 312 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 313 " incrementing refs\n", filename)); 314 *result = lf; 315 lf->refs++; 316 goto out; 317 } 318 lf = NULL; 319 foundfile = 0; 320 TAILQ_FOREACH(lc, &classes, link) { 321 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 322 filename)); 323 error = LINKER_LOAD_FILE(lc, filename, &lf); 324 /* 325 * If we got something other than ENOENT, then it exists but 326 * we cannot load it for some other reason. 327 */ 328 if (error != ENOENT) 329 foundfile = 1; 330 if (lf) { 331 linker_file_register_modules(lf); 332 linker_file_register_sysctls(lf); 333 linker_file_sysinit(lf); 334 lf->flags |= LINKER_FILE_LINKED; 335 *result = lf; 336 error = 0; 337 goto out; 338 } 339 } 340 /* 341 * Less than ideal, but tells the user whether it failed to load or 342 * the module was not found. 343 */ 344 if (foundfile) 345 /* Format not recognized (or unloadable). */ 346 error = ENOEXEC; 347 else 348 error = ENOENT; /* Nothing found */ 349out: 350 return (error); 351} 352 353/* XXX: function parameters are incomplete */ 354int 355linker_reference_module(const char *modname, linker_file_t *result) 356{ 357 return (linker_load_module(NULL, modname, NULL, NULL, result)); 358} 359 360linker_file_t 361linker_find_file_by_name(const char *filename) 362{ 363 linker_file_t lf = 0; 364 char *koname; 365 int err; 366 367 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 368 if (koname == NULL) 369 goto out; 370 sprintf(koname, "%s.ko", filename); 371 372 lockmgr(&lock, LK_SHARED, 0, curthread); 373 TAILQ_FOREACH(lf, &linker_files, link) { 374 err = strcmp(lf->filename, koname); 375 if (err == 0) 376 break; 377 err = strcmp(lf->filename, filename); 378 if (err == 0) 379 break; 380 } 381 lockmgr(&lock, LK_RELEASE, 0, curthread); 382out: 383 if (koname) 384 free(koname, M_LINKER); 385 return (lf); 386} 387 388linker_file_t 389linker_find_file_by_id(int fileid) 390{ 391 linker_file_t lf = 0; 392 393 lockmgr(&lock, LK_SHARED, 0, curthread); 394 TAILQ_FOREACH(lf, &linker_files, link) 395 if (lf->id == fileid) 396 break; 397 lockmgr(&lock, LK_RELEASE, 0, curthread); 398 return (lf); 399} 400 401linker_file_t 402linker_make_file(const char *pathname, linker_class_t lc) 403{ 404 linker_file_t lf; 405 const char *filename; 406 407 lf = NULL; 408 filename = linker_basename(pathname); 409 410 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 411 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread); 412 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 413 if (lf == NULL) 414 goto out; 415 lf->refs = 1; 416 lf->userrefs = 0; 417 lf->flags = 0; 418 lf->filename = linker_strdup(filename); 419 LINKER_GET_NEXT_FILE_ID(lf->id); 420 lf->ndeps = 0; 421 lf->deps = NULL; 422 STAILQ_INIT(&lf->common); 423 TAILQ_INIT(&lf->modules); 424 TAILQ_INSERT_TAIL(&linker_files, lf, link); 425out: 426 lockmgr(&lock, LK_RELEASE, 0, curthread); 427 return (lf); 428} 429 430int 431linker_file_unload(linker_file_t file) 432{ 433 module_t mod, next; 434 modlist_t ml, nextml; 435 struct common_symbol *cp; 436 int error, i; 437 438 error = 0; 439 440 /* Refuse to unload modules if securelevel raised. */ 441 if (securelevel > 0) 442 return (EPERM); 443 444 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 445 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread); 446 if (file->refs == 1) { 447 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 448 " informing modules\n")); 449 450 /* 451 * Inform any modules associated with this file. 452 */ 453 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 454 next = module_getfnext(mod); 455 456 /* 457 * Give the module a chance to veto the unload. 458 */ 459 if ((error = module_unload(mod)) != 0) { 460 KLD_DPF(FILE, ("linker_file_unload: module %x" 461 " vetoes unload\n", mod)); 462 lockmgr(&lock, LK_RELEASE, 0, curthread); 463 goto out; 464 } 465 module_release(mod); 466 } 467 } 468 file->refs--; 469 if (file->refs > 0) { 470 lockmgr(&lock, LK_RELEASE, 0, curthread); 471 goto out; 472 } 473 for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) { 474 nextml = TAILQ_NEXT(ml, link); 475 if (ml->container == file) 476 TAILQ_REMOVE(&found_modules, ml, link); 477 } 478 479 /* 480 * Don't try to run SYSUNINITs if we are unloaded due to a 481 * link error. 482 */ 483 if (file->flags & LINKER_FILE_LINKED) { 484 linker_file_sysuninit(file); 485 linker_file_unregister_sysctls(file); 486 } 487 TAILQ_REMOVE(&linker_files, file, link); 488 lockmgr(&lock, LK_RELEASE, 0, curthread); 489 490 if (file->deps) { 491 for (i = 0; i < file->ndeps; i++) 492 linker_file_unload(file->deps[i]); 493 free(file->deps, M_LINKER); 494 file->deps = NULL; 495 } 496 for (cp = STAILQ_FIRST(&file->common); cp; 497 cp = STAILQ_FIRST(&file->common)) { 498 STAILQ_REMOVE(&file->common, cp, common_symbol, link); 499 free(cp, M_LINKER); 500 } 501 502 LINKER_UNLOAD(file); 503 if (file->filename) { 504 free(file->filename, M_LINKER); 505 file->filename = NULL; 506 } 507 kobj_delete((kobj_t) file, M_LINKER); 508out: 509 return (error); 510} 511 512int 513linker_file_add_dependency(linker_file_t file, linker_file_t dep) 514{ 515 linker_file_t *newdeps; 516 517 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 518 M_LINKER, M_WAITOK | M_ZERO); 519 if (newdeps == NULL) 520 return (ENOMEM); 521 522 if (file->deps) { 523 bcopy(file->deps, newdeps, 524 file->ndeps * sizeof(linker_file_t *)); 525 free(file->deps, M_LINKER); 526 } 527 file->deps = newdeps; 528 file->deps[file->ndeps] = dep; 529 file->ndeps++; 530 return (0); 531} 532 533/* 534 * Locate a linker set and its contents. This is a helper function to avoid 535 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void *** 536 */ 537int 538linker_file_lookup_set(linker_file_t file, const char *name, 539 void *firstp, void *lastp, int *countp) 540{ 541 542 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 543} 544 545caddr_t 546linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 547{ 548 c_linker_sym_t sym; 549 linker_symval_t symval; 550 caddr_t address; 551 size_t common_size = 0; 552 int err, i; 553 554 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n", 555 file, name, deps)); 556 557 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 558 LINKER_SYMBOL_VALUES(file, sym, &symval); 559 if (symval.value == 0) 560 /* 561 * For commons, first look them up in the 562 * dependencies and only allocate space if not found 563 * there. 564 */ 565 common_size = symval.size; 566 else { 567 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 568 ".value=%x\n", symval.value)); 569 return (symval.value); 570 } 571 } 572 if (deps) { 573 for (i = 0; i < file->ndeps; i++) { 574 address = linker_file_lookup_symbol(file->deps[i], 575 name, 0); 576 if (address) { 577 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 578 " deps value=%x\n", address)); 579 return (address); 580 } 581 } 582 } 583 if (common_size > 0) { 584 /* 585 * This is a common symbol which was not found in the 586 * dependencies. We maintain a simple common symbol table in 587 * the file object. 588 */ 589 struct common_symbol *cp; 590 591 STAILQ_FOREACH(cp, &file->common, link) { 592 err = strcmp(cp->name, name); 593 if (err == 0) { 594 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 595 " old common value=%x\n", cp->address)); 596 return (cp->address); 597 } 598 } 599 /* 600 * Round the symbol size up to align. 601 */ 602 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 603 cp = malloc(sizeof(struct common_symbol) 604 + common_size + strlen(name) + 1, M_LINKER, 605 M_WAITOK | M_ZERO); 606 if (cp == NULL) { 607 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 608 return (0); 609 } 610 cp->address = (caddr_t)(cp + 1); 611 cp->name = cp->address + common_size; 612 strcpy(cp->name, name); 613 bzero(cp->address, common_size); 614 STAILQ_INSERT_TAIL(&file->common, cp, link); 615 616 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 617 " value=%x\n", cp->address)); 618 return (cp->address); 619 } 620 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 621 return (0); 622} 623 624#ifdef DDB 625/* 626 * DDB Helpers. DDB has to look across multiple files with their own symbol 627 * tables and string tables. 628 * 629 * Note that we do not obey list locking protocols here. We really don't need 630 * DDB to hang because somebody's got the lock held. We'll take the chance 631 * that the files list is inconsistant instead. 632 */ 633 634int 635linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 636{ 637 linker_file_t lf; 638 639 TAILQ_FOREACH(lf, &linker_files, link) { 640 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 641 return (0); 642 } 643 return (ENOENT); 644} 645 646int 647linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 648{ 649 linker_file_t lf; 650 c_linker_sym_t best, es; 651 u_long diff, bestdiff, off; 652 653 best = 0; 654 off = (uintptr_t)value; 655 bestdiff = off; 656 TAILQ_FOREACH(lf, &linker_files, link) { 657 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 658 continue; 659 if (es != 0 && diff < bestdiff) { 660 best = es; 661 bestdiff = diff; 662 } 663 if (bestdiff == 0) 664 break; 665 } 666 if (best) { 667 *sym = best; 668 *diffp = bestdiff; 669 return (0); 670 } else { 671 *sym = 0; 672 *diffp = off; 673 return (ENOENT); 674 } 675} 676 677int 678linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 679{ 680 linker_file_t lf; 681 682 TAILQ_FOREACH(lf, &linker_files, link) { 683 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 684 return (0); 685 } 686 return (ENOENT); 687} 688#endif 689 690/* 691 * Syscalls. 692 */ 693/* 694 * MPSAFE 695 */ 696int 697kldload(struct thread *td, struct kldload_args *uap) 698{ 699 char *kldname, *modname; 700 char *pathname = NULL; 701 linker_file_t lf; 702 int error = 0; 703 704 td->td_retval[0] = -1; 705 706 if (securelevel > 0) /* redundant, but that's OK */ 707 return (EPERM); 708 709 mtx_lock(&Giant); 710 711 if ((error = suser_xxx(td->td_ucred, NULL, 0)) != 0) 712 goto out; 713 714 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 715 if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 716 NULL)) != 0) 717 goto out; 718 719 /* 720 * If path do not contain qualified name or any dot in it 721 * (kldname.ko, or kldname.ver.ko) treat it as interface 722 * name. 723 */ 724 if (index(pathname, '/') || index(pathname, '.')) { 725 kldname = pathname; 726 modname = NULL; 727 } else { 728 kldname = NULL; 729 modname = pathname; 730 } 731 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 732 if (error) 733 goto out; 734 735 lf->userrefs++; 736 td->td_retval[0] = lf->id; 737out: 738 if (pathname) 739 free(pathname, M_TEMP); 740 mtx_unlock(&Giant); 741 return (error); 742} 743 744/* 745 * MPSAFE 746 */ 747int 748kldunload(struct thread *td, struct kldunload_args *uap) 749{ 750 linker_file_t lf; 751 int error = 0; 752 753 if (securelevel > 0) /* redundant, but that's OK */ 754 return (EPERM); 755 756 mtx_lock(&Giant); 757 758 if ((error = suser_xxx(td->td_ucred, NULL, 0)) != 0) 759 goto out; 760 761 lf = linker_find_file_by_id(SCARG(uap, fileid)); 762 if (lf) { 763 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 764 if (lf->userrefs == 0) { 765 printf("kldunload: attempt to unload file that was" 766 " loaded by the kernel\n"); 767 error = EBUSY; 768 goto out; 769 } 770 lf->userrefs--; 771 error = linker_file_unload(lf); 772 if (error) 773 lf->userrefs++; 774 } else 775 error = ENOENT; 776out: 777 mtx_unlock(&Giant); 778 return (error); 779} 780 781/* 782 * MPSAFE 783 */ 784int 785kldfind(struct thread *td, struct kldfind_args *uap) 786{ 787 char *pathname; 788 const char *filename; 789 linker_file_t lf; 790 int error = 0; 791 792 mtx_lock(&Giant); 793 td->td_retval[0] = -1; 794 795 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 796 if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 797 NULL)) != 0) 798 goto out; 799 800 filename = linker_basename(pathname); 801 lf = linker_find_file_by_name(filename); 802 if (lf) 803 td->td_retval[0] = lf->id; 804 else 805 error = ENOENT; 806out: 807 if (pathname) 808 free(pathname, M_TEMP); 809 mtx_unlock(&Giant); 810 return (error); 811} 812 813/* 814 * MPSAFE 815 */ 816int 817kldnext(struct thread *td, struct kldnext_args *uap) 818{ 819 linker_file_t lf; 820 int error = 0; 821 822 mtx_lock(&Giant); 823 824 if (SCARG(uap, fileid) == 0) { 825 if (TAILQ_FIRST(&linker_files)) 826 td->td_retval[0] = TAILQ_FIRST(&linker_files)->id; 827 else 828 td->td_retval[0] = 0; 829 goto out; 830 } 831 lf = linker_find_file_by_id(SCARG(uap, fileid)); 832 if (lf) { 833 if (TAILQ_NEXT(lf, link)) 834 td->td_retval[0] = TAILQ_NEXT(lf, link)->id; 835 else 836 td->td_retval[0] = 0; 837 } else 838 error = ENOENT; 839out: 840 mtx_unlock(&Giant); 841 return (error); 842} 843 844/* 845 * MPSAFE 846 */ 847int 848kldstat(struct thread *td, struct kldstat_args *uap) 849{ 850 linker_file_t lf; 851 int error = 0; 852 int namelen, version; 853 struct kld_file_stat *stat; 854 855 mtx_lock(&Giant); 856 857 lf = linker_find_file_by_id(SCARG(uap, fileid)); 858 if (lf == NULL) { 859 error = ENOENT; 860 goto out; 861 } 862 stat = SCARG(uap, stat); 863 864 /* 865 * Check the version of the user's structure. 866 */ 867 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 868 goto out; 869 if (version != sizeof(struct kld_file_stat)) { 870 error = EINVAL; 871 goto out; 872 } 873 namelen = strlen(lf->filename) + 1; 874 if (namelen > MAXPATHLEN) 875 namelen = MAXPATHLEN; 876 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 877 goto out; 878 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 879 goto out; 880 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 881 goto out; 882 if ((error = copyout(&lf->address, &stat->address, 883 sizeof(caddr_t))) != 0) 884 goto out; 885 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 886 goto out; 887 888 td->td_retval[0] = 0; 889out: 890 mtx_unlock(&Giant); 891 return (error); 892} 893 894/* 895 * MPSAFE 896 */ 897int 898kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 899{ 900 linker_file_t lf; 901 module_t mp; 902 int error = 0; 903 904 mtx_lock(&Giant); 905 lf = linker_find_file_by_id(SCARG(uap, fileid)); 906 if (lf) { 907 mp = TAILQ_FIRST(&lf->modules); 908 if (mp != NULL) 909 td->td_retval[0] = module_getid(mp); 910 else 911 td->td_retval[0] = 0; 912 } else 913 error = ENOENT; 914 mtx_unlock(&Giant); 915 return (error); 916} 917 918/* 919 * MPSAFE 920 */ 921int 922kldsym(struct thread *td, struct kldsym_args *uap) 923{ 924 char *symstr = NULL; 925 c_linker_sym_t sym; 926 linker_symval_t symval; 927 linker_file_t lf; 928 struct kld_sym_lookup lookup; 929 int error = 0; 930 931 mtx_lock(&Giant); 932 933 if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0) 934 goto out; 935 if (lookup.version != sizeof(lookup) || 936 SCARG(uap, cmd) != KLDSYM_LOOKUP) { 937 error = EINVAL; 938 goto out; 939 } 940 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 941 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 942 goto out; 943 if (SCARG(uap, fileid) != 0) { 944 lf = linker_find_file_by_id(SCARG(uap, fileid)); 945 if (lf == NULL) { 946 error = ENOENT; 947 goto out; 948 } 949 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 950 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 951 lookup.symvalue = (uintptr_t) symval.value; 952 lookup.symsize = symval.size; 953 error = copyout(&lookup, SCARG(uap, data), 954 sizeof(lookup)); 955 } else 956 error = ENOENT; 957 } else { 958 TAILQ_FOREACH(lf, &linker_files, link) { 959 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 960 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 961 lookup.symvalue = (uintptr_t)symval.value; 962 lookup.symsize = symval.size; 963 error = copyout(&lookup, SCARG(uap, data), 964 sizeof(lookup)); 965 break; 966 } 967 } 968 if (lf == NULL) 969 error = ENOENT; 970 } 971out: 972 if (symstr) 973 free(symstr, M_TEMP); 974 mtx_unlock(&Giant); 975 return (error); 976} 977 978/* 979 * Preloaded module support 980 */ 981 982static modlist_t 983modlist_lookup(const char *name, int ver) 984{ 985 modlist_t mod; 986 int err; 987 988 TAILQ_FOREACH(mod, &found_modules, link) { 989 err = strcmp(mod->name, name); 990 if (err == 0 && (ver == 0 || mod->version == ver)) 991 return (mod); 992 } 993 return (NULL); 994} 995 996static modlist_t 997modlist_lookup2(const char *name, struct mod_depend *verinfo) 998{ 999 modlist_t mod, bestmod; 1000 int err, ver; 1001 1002 if (verinfo == NULL) 1003 return (modlist_lookup(name, 0)); 1004 bestmod = NULL; 1005 for (mod = TAILQ_FIRST(&found_modules); mod; 1006 mod = TAILQ_NEXT(mod, link)) { 1007 err = strcmp(mod->name, name); 1008 if (err != 0) 1009 continue; 1010 ver = mod->version; 1011 if (ver == verinfo->md_ver_preferred) 1012 return (mod); 1013 if (ver >= verinfo->md_ver_minimum && 1014 ver <= verinfo->md_ver_maximum && 1015 ver > bestmod->version) 1016 bestmod = mod; 1017 } 1018 return (bestmod); 1019} 1020 1021static modlist_t 1022modlist_newmodule(const char *modname, int version, linker_file_t container) 1023{ 1024 modlist_t mod; 1025 1026 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT); 1027 if (mod == NULL) 1028 panic("no memory for module list"); 1029 bzero(mod, sizeof(*mod)); 1030 mod->container = container; 1031 mod->name = modname; 1032 mod->version = version; 1033 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1034 return (mod); 1035} 1036 1037/* 1038 * This routine is cheap and nasty but will work for data pointers. 1039 */ 1040static void * 1041linker_reloc_ptr(linker_file_t lf, const void *offset) 1042{ 1043 return (lf->address + (uintptr_t)offset); 1044} 1045 1046/* 1047 * Dereference MDT_VERSION metadata into module name and version 1048 */ 1049static void 1050linker_mdt_version(linker_file_t lf, struct mod_metadata *mp, 1051 const char **modname, int *version) 1052{ 1053 struct mod_version *mvp; 1054 1055 if (modname) 1056 *modname = linker_reloc_ptr(lf, mp->md_cval); 1057 if (version) { 1058 mvp = linker_reloc_ptr(lf, mp->md_data); 1059 *version = mvp->mv_version; 1060 } 1061} 1062 1063/* 1064 * Dereference MDT_DEPEND metadata into module name and mod_depend structure 1065 */ 1066static void 1067linker_mdt_depend(linker_file_t lf, struct mod_metadata *mp, 1068 const char **modname, struct mod_depend **verinfo) 1069{ 1070 1071 if (modname) 1072 *modname = linker_reloc_ptr(lf, mp->md_cval); 1073 if (verinfo) 1074 *verinfo = linker_reloc_ptr(lf, mp->md_data); 1075} 1076 1077static void 1078linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1079 struct mod_metadata **stop, int preload) 1080{ 1081 struct mod_metadata *mp, **mdp; 1082 const char *modname; 1083 int ver; 1084 1085 for (mdp = start; mdp < stop; mdp++) { 1086 if (preload) 1087 mp = *mdp; 1088 else 1089 mp = linker_reloc_ptr(lf, *mdp); 1090 if (mp->md_type != MDT_VERSION) 1091 continue; 1092 if (preload) { 1093 modname = mp->md_cval; 1094 ver = ((struct mod_version *)mp->md_data)->mv_version; 1095 } else 1096 linker_mdt_version(lf, mp, &modname, &ver); 1097 if (modlist_lookup(modname, ver) != NULL) { 1098 printf("module %s already present!\n", modname); 1099 /* XXX what can we do? this is a build error. :-( */ 1100 continue; 1101 } 1102 modlist_newmodule(modname, ver, lf); 1103 } 1104} 1105 1106static void 1107linker_preload(void *arg) 1108{ 1109 caddr_t modptr; 1110 const char *modname, *nmodname; 1111 char *modtype; 1112 linker_file_t lf; 1113 linker_class_t lc; 1114 int error, err; 1115 linker_file_list_t loaded_files; 1116 linker_file_list_t depended_files; 1117 struct mod_metadata *mp, *nmp; 1118 struct mod_metadata **start, **stop, **mdp, **nmdp; 1119 struct mod_depend *verinfo; 1120 int nver; 1121 int resolves; 1122 modlist_t mod; 1123 struct sysinit **si_start, **si_stop; 1124 1125 TAILQ_INIT(&loaded_files); 1126 TAILQ_INIT(&depended_files); 1127 TAILQ_INIT(&found_modules); 1128 error = 0; 1129 1130 modptr = NULL; 1131 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1132 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1133 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1134 if (modname == NULL) { 1135 printf("Preloaded module at %p does not have a" 1136 " name!\n", modptr); 1137 continue; 1138 } 1139 if (modtype == NULL) { 1140 printf("Preloaded module at %p does not have a type!\n", 1141 modptr); 1142 continue; 1143 } 1144 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1145 modptr); 1146 lf = NULL; 1147 TAILQ_FOREACH(lc, &classes, link) { 1148 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1149 if (error) { 1150 lf = NULL; 1151 break; 1152 } 1153 } 1154 if (lf) 1155 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1156 } 1157 1158 /* 1159 * First get a list of stuff in the kernel. 1160 */ 1161 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1162 &stop, NULL) == 0) 1163 linker_addmodules(linker_kernel_file, start, stop, 1); 1164 1165 /* 1166 * this is a once-off kinky bubble sort resolve relocation dependency 1167 * requirements 1168 */ 1169restart: 1170 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1171 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1172 &stop, NULL); 1173 /* 1174 * First, look to see if we would successfully link with this 1175 * stuff. 1176 */ 1177 resolves = 1; /* unless we know otherwise */ 1178 if (!error) { 1179 for (mdp = start; mdp < stop; mdp++) { 1180 mp = linker_reloc_ptr(lf, *mdp); 1181 if (mp->md_type != MDT_DEPEND) 1182 continue; 1183 linker_mdt_depend(lf, mp, &modname, &verinfo); 1184 for (nmdp = start; nmdp < stop; nmdp++) { 1185 nmp = linker_reloc_ptr(lf, *nmdp); 1186 if (nmp->md_type != MDT_VERSION) 1187 continue; 1188 linker_mdt_version(lf, nmp, &nmodname, 1189 NULL); 1190 nmodname = linker_reloc_ptr(lf, 1191 nmp->md_cval); 1192 err = strcmp(modname, nmodname); 1193 if (err == 0) 1194 break; 1195 } 1196 if (nmdp < stop) /* it's a self reference */ 1197 continue; 1198 1199 /* 1200 * ok, the module isn't here yet, we 1201 * are not finished 1202 */ 1203 if (modlist_lookup2(modname, verinfo) == NULL) 1204 resolves = 0; 1205 } 1206 } 1207 /* 1208 * OK, if we found our modules, we can link. So, "provide" 1209 * the modules inside and add it to the end of the link order 1210 * list. 1211 */ 1212 if (resolves) { 1213 if (!error) { 1214 for (mdp = start; mdp < stop; mdp++) { 1215 mp = linker_reloc_ptr(lf, *mdp); 1216 if (mp->md_type != MDT_VERSION) 1217 continue; 1218 linker_mdt_version(lf, mp, 1219 &modname, &nver); 1220 if (modlist_lookup(modname, 1221 nver) != NULL) { 1222 printf("module %s already" 1223 " present!\n", modname); 1224 linker_file_unload(lf); 1225 TAILQ_REMOVE(&loaded_files, 1226 lf, loaded); 1227 /* we changed tailq next ptr */ 1228 goto restart; 1229 } 1230 modlist_newmodule(modname, nver, lf); 1231 } 1232 } 1233 TAILQ_REMOVE(&loaded_files, lf, loaded); 1234 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1235 /* 1236 * Since we provided modules, we need to restart the 1237 * sort so that the previous files that depend on us 1238 * have a chance. Also, we've busted the tailq next 1239 * pointer with the REMOVE. 1240 */ 1241 goto restart; 1242 } 1243 } 1244 1245 /* 1246 * At this point, we check to see what could not be resolved.. 1247 */ 1248 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1249 printf("KLD file %s is missing dependencies\n", lf->filename); 1250 linker_file_unload(lf); 1251 TAILQ_REMOVE(&loaded_files, lf, loaded); 1252 } 1253 1254 /* 1255 * We made it. Finish off the linking in the order we determined. 1256 */ 1257 TAILQ_FOREACH(lf, &depended_files, loaded) { 1258 if (linker_kernel_file) { 1259 linker_kernel_file->refs++; 1260 error = linker_file_add_dependency(lf, 1261 linker_kernel_file); 1262 if (error) 1263 panic("cannot add dependency"); 1264 } 1265 lf->userrefs++; /* so we can (try to) kldunload it */ 1266 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1267 &stop, NULL); 1268 if (!error) { 1269 for (mdp = start; mdp < stop; mdp++) { 1270 mp = linker_reloc_ptr(lf, *mdp); 1271 if (mp->md_type != MDT_DEPEND) 1272 continue; 1273 linker_mdt_depend(lf, mp, &modname, &verinfo); 1274 mod = modlist_lookup2(modname, verinfo); 1275 mod->container->refs++; 1276 error = linker_file_add_dependency(lf, 1277 mod->container); 1278 if (error) 1279 panic("cannot add dependency"); 1280 } 1281 } 1282 /* 1283 * Now do relocation etc using the symbol search paths 1284 * established by the dependencies 1285 */ 1286 error = LINKER_LINK_PRELOAD_FINISH(lf); 1287 if (error) { 1288 printf("KLD file %s - could not finalize loading\n", 1289 lf->filename); 1290 linker_file_unload(lf); 1291 continue; 1292 } 1293 linker_file_register_modules(lf); 1294 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1295 &si_stop, NULL) == 0) 1296 sysinit_add(si_start, si_stop); 1297 linker_file_register_sysctls(lf); 1298 lf->flags |= LINKER_FILE_LINKED; 1299 } 1300 /* woohoo! we made it! */ 1301} 1302 1303SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0) 1304 1305/* 1306 * Search for a not-loaded module by name. 1307 * 1308 * Modules may be found in the following locations: 1309 * 1310 * - preloaded (result is just the module name) - on disk (result is full path 1311 * to module) 1312 * 1313 * If the module name is qualified in any way (contains path, etc.) the we 1314 * simply return a copy of it. 1315 * 1316 * The search path can be manipulated via sysctl. Note that we use the ';' 1317 * character as a separator to be consistent with the bootloader. 1318 */ 1319 1320static char linker_hintfile[] = "linker.hints"; 1321static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules;/modules"; 1322 1323SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1324 sizeof(linker_path), "module load search path"); 1325 1326TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1327 1328static char *linker_ext_list[] = { 1329 "", 1330 ".ko", 1331 NULL 1332}; 1333 1334/* 1335 * Check if file actually exists either with or without extension listed in 1336 * the linker_ext_list. (probably should be generic for the rest of the 1337 * kernel) 1338 */ 1339static char * 1340linker_lookup_file(const char *path, int pathlen, const char *name, 1341 int namelen, struct vattr *vap) 1342{ 1343 struct nameidata nd; 1344 struct thread *td = curthread; /* XXX */ 1345 char *result, **cpp, *sep; 1346 int error, len, extlen, reclen, flags; 1347 enum vtype type; 1348 1349 extlen = 0; 1350 for (cpp = linker_ext_list; *cpp; cpp++) { 1351 len = strlen(*cpp); 1352 if (len > extlen) 1353 extlen = len; 1354 } 1355 extlen++; /* trailing '\0' */ 1356 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1357 1358 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1359 result = malloc(reclen, M_LINKER, M_WAITOK); 1360 for (cpp = linker_ext_list; *cpp; cpp++) { 1361 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1362 namelen, name, *cpp); 1363 /* 1364 * Attempt to open the file, and return the path if 1365 * we succeed and it's a regular file. 1366 */ 1367 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1368 flags = FREAD; 1369 error = vn_open(&nd, &flags, 0); 1370 if (error == 0) { 1371 NDFREE(&nd, NDF_ONLY_PNBUF); 1372 type = nd.ni_vp->v_type; 1373 if (vap) 1374 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred, td); 1375 VOP_UNLOCK(nd.ni_vp, 0, td); 1376 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1377 if (type == VREG) 1378 return (result); 1379 } 1380 } 1381 free(result, M_LINKER); 1382 return (NULL); 1383} 1384 1385#define INT_ALIGN(base, ptr) ptr = \ 1386 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 1387 1388/* 1389 * Lookup KLD which contains requested module in the "linker.hints" file. If 1390 * version specification is available, then try to find the best KLD. 1391 * Otherwise just find the latest one. 1392 * 1393 * XXX: Vnode locking here is hosed; lock should be held for calls to 1394 * VOP_GETATTR() and vn_rdwr(). 1395 */ 1396static char * 1397linker_hints_lookup(const char *path, int pathlen, const char *modname, 1398 int modnamelen, struct mod_depend *verinfo) 1399{ 1400 struct thread *td = curthread; /* XXX */ 1401 struct ucred *cred = td ? td->td_ucred : NULL; 1402 struct nameidata nd; 1403 struct vattr vattr, mattr; 1404 u_char *hints = NULL; 1405 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1406 int error, ival, bestver, *intp, reclen, found, flags, clen, blen; 1407 1408 result = NULL; 1409 bestver = found = 0; 1410 1411 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1412 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1413 strlen(sep) + 1; 1414 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1415 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1416 linker_hintfile); 1417 1418 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1419 flags = FREAD; 1420 error = vn_open(&nd, &flags, 0); 1421 if (error) 1422 goto bad; 1423 NDFREE(&nd, NDF_ONLY_PNBUF); 1424 VOP_UNLOCK(nd.ni_vp, 0, td); 1425 if (nd.ni_vp->v_type != VREG) 1426 goto bad; 1427 best = cp = NULL; 1428 error = VOP_GETATTR(nd.ni_vp, &vattr, cred, td); 1429 if (error) 1430 goto bad; 1431 /* 1432 * XXX: we need to limit this number to some reasonable value 1433 */ 1434 if (vattr.va_size > 100 * 1024) { 1435 printf("hints file too large %ld\n", (long)vattr.va_size); 1436 goto bad; 1437 } 1438 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1439 if (hints == NULL) 1440 goto bad; 1441 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1442 UIO_SYSSPACE, IO_NODELOCKED, cred, &reclen, td); 1443 if (error) 1444 goto bad; 1445 vn_close(nd.ni_vp, FREAD, cred, td); 1446 nd.ni_vp = NULL; 1447 if (reclen != 0) { 1448 printf("can't read %d\n", reclen); 1449 goto bad; 1450 } 1451 intp = (int *)hints; 1452 ival = *intp++; 1453 if (ival != LINKER_HINTS_VERSION) { 1454 printf("hints file version mismatch %d\n", ival); 1455 goto bad; 1456 } 1457 bufend = hints + vattr.va_size; 1458 recptr = (u_char *)intp; 1459 clen = blen = 0; 1460 while (recptr < bufend && !found) { 1461 intp = (int *)recptr; 1462 reclen = *intp++; 1463 ival = *intp++; 1464 cp = (char *)intp; 1465 switch (ival) { 1466 case MDT_VERSION: 1467 clen = *cp++; 1468 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1469 break; 1470 cp += clen; 1471 INT_ALIGN(hints, cp); 1472 ival = *(int *)cp; 1473 cp += sizeof(int); 1474 clen = *cp++; 1475 if (verinfo == NULL || 1476 ival == verinfo->md_ver_preferred) { 1477 found = 1; 1478 break; 1479 } 1480 if (ival >= verinfo->md_ver_minimum && 1481 ival <= verinfo->md_ver_maximum && 1482 ival > bestver) { 1483 bestver = ival; 1484 best = cp; 1485 blen = clen; 1486 } 1487 break; 1488 default: 1489 break; 1490 } 1491 recptr += reclen + sizeof(int); 1492 } 1493 /* 1494 * Finally check if KLD is in the place 1495 */ 1496 if (found) 1497 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1498 else if (best) 1499 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1500 1501 /* 1502 * KLD is newer than hints file. What we should do now? 1503 */ 1504 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1505 printf("warning: KLD '%s' is newer than the linker.hints" 1506 " file\n", result); 1507bad: 1508 if (hints) 1509 free(hints, M_TEMP); 1510 if (nd.ni_vp != NULL) 1511 vn_close(nd.ni_vp, FREAD, cred, td); 1512 /* 1513 * If nothing found or hints is absent - fallback to the old 1514 * way by using "kldname[.ko]" as module name. 1515 */ 1516 if (!found && !bestver && result == NULL) 1517 result = linker_lookup_file(path, pathlen, modname, 1518 modnamelen, NULL); 1519 return (result); 1520} 1521 1522/* 1523 * Lookup KLD which contains requested module in the all directories. 1524 */ 1525static char * 1526linker_search_module(const char *modname, int modnamelen, 1527 struct mod_depend *verinfo) 1528{ 1529 char *cp, *ep, *result; 1530 1531 /* 1532 * traverse the linker path 1533 */ 1534 for (cp = linker_path; *cp; cp = ep + 1) { 1535 /* find the end of this component */ 1536 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1537 result = linker_hints_lookup(cp, ep - cp, modname, 1538 modnamelen, verinfo); 1539 if (result != NULL) 1540 return (result); 1541 if (*ep == 0) 1542 break; 1543 } 1544 return (NULL); 1545} 1546 1547/* 1548 * Search for module in all directories listed in the linker_path. 1549 */ 1550static char * 1551linker_search_kld(const char *name) 1552{ 1553 char *cp, *ep, *result, **cpp; 1554 int extlen, len; 1555 1556 /* qualified at all? */ 1557 if (index(name, '/')) 1558 return (linker_strdup(name)); 1559 1560 extlen = 0; 1561 for (cpp = linker_ext_list; *cpp; cpp++) { 1562 len = strlen(*cpp); 1563 if (len > extlen) 1564 extlen = len; 1565 } 1566 extlen++; /* trailing '\0' */ 1567 1568 /* traverse the linker path */ 1569 len = strlen(name); 1570 for (ep = linker_path; *ep; ep++) { 1571 cp = ep; 1572 /* find the end of this component */ 1573 for (; *ep != 0 && *ep != ';'; ep++); 1574 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 1575 if (result != NULL) 1576 return (result); 1577 } 1578 return (NULL); 1579} 1580 1581static const char * 1582linker_basename(const char *path) 1583{ 1584 const char *filename; 1585 1586 filename = rindex(path, '/'); 1587 if (filename == NULL) 1588 return path; 1589 if (filename[1]) 1590 filename++; 1591 return (filename); 1592} 1593 1594/* 1595 * Find a file which contains given module and load it, if "parent" is not 1596 * NULL, register a reference to it. 1597 */ 1598static int 1599linker_load_module(const char *kldname, const char *modname, 1600 struct linker_file *parent, struct mod_depend *verinfo, 1601 struct linker_file **lfpp) 1602{ 1603 linker_file_t lfdep; 1604 const char *filename; 1605 char *pathname; 1606 int error; 1607 1608 if (modname == NULL) { 1609 /* 1610 * We have to load KLD 1611 */ 1612 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 1613 " is not NULL")); 1614 pathname = linker_search_kld(kldname); 1615 } else { 1616 if (modlist_lookup2(modname, verinfo) != NULL) 1617 return (EEXIST); 1618 if (kldname == NULL) 1619 /* 1620 * Need to find a KLD with required module 1621 */ 1622 pathname = linker_search_module(modname, 1623 strlen(modname), verinfo); 1624 else 1625 pathname = linker_strdup(kldname); 1626 } 1627 if (pathname == NULL) 1628 return (ENOENT); 1629 1630 /* 1631 * Can't load more than one file with the same basename XXX: 1632 * Actually it should be possible to have multiple KLDs with 1633 * the same basename but different path because they can 1634 * provide different versions of the same modules. 1635 */ 1636 filename = linker_basename(pathname); 1637 if (linker_find_file_by_name(filename)) { 1638 error = EEXIST; 1639 goto out; 1640 } 1641 do { 1642 error = linker_load_file(pathname, &lfdep); 1643 if (error) 1644 break; 1645 if (modname && verinfo && 1646 modlist_lookup2(modname, verinfo) == NULL) { 1647 linker_file_unload(lfdep); 1648 error = ENOENT; 1649 break; 1650 } 1651 if (parent) { 1652 error = linker_file_add_dependency(parent, lfdep); 1653 if (error) 1654 break; 1655 } 1656 if (lfpp) 1657 *lfpp = lfdep; 1658 } while (0); 1659out: 1660 if (pathname) 1661 free(pathname, M_LINKER); 1662 return (error); 1663} 1664 1665/* 1666 * This routine is responsible for finding dependencies of userland initiated 1667 * kldload(2)'s of files. 1668 */ 1669int 1670linker_load_dependencies(linker_file_t lf) 1671{ 1672 linker_file_t lfdep; 1673 struct mod_metadata **start, **stop, **mdp, **nmdp; 1674 struct mod_metadata *mp, *nmp; 1675 struct mod_depend *verinfo; 1676 modlist_t mod; 1677 const char *modname, *nmodname; 1678 int ver, error = 0, err, count; 1679 1680 /* 1681 * All files are dependant on /kernel. 1682 */ 1683 if (linker_kernel_file) { 1684 linker_kernel_file->refs++; 1685 error = linker_file_add_dependency(lf, linker_kernel_file); 1686 if (error) 1687 return (error); 1688 } 1689 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 1690 &count) != 0) 1691 return (0); 1692 for (mdp = start; mdp < stop; mdp++) { 1693 mp = linker_reloc_ptr(lf, *mdp); 1694 if (mp->md_type != MDT_VERSION) 1695 continue; 1696 linker_mdt_version(lf, mp, &modname, &ver); 1697 mod = modlist_lookup(modname, ver); 1698 if (mod != NULL) { 1699 printf("interface %s.%d already present in the KLD" 1700 " '%s'!\n", modname, ver, 1701 mod->container->filename); 1702 return (EEXIST); 1703 } 1704 } 1705 1706 for (mdp = start; mdp < stop; mdp++) { 1707 mp = linker_reloc_ptr(lf, *mdp); 1708 if (mp->md_type != MDT_DEPEND) 1709 continue; 1710 linker_mdt_depend(lf, mp, &modname, &verinfo); 1711 nmodname = NULL; 1712 for (nmdp = start; nmdp < stop; nmdp++) { 1713 nmp = linker_reloc_ptr(lf, *nmdp); 1714 if (nmp->md_type != MDT_VERSION) 1715 continue; 1716 nmodname = linker_reloc_ptr(lf, nmp->md_cval); 1717 err = strcmp(modname, nmodname); 1718 if (err == 0) 1719 break; 1720 } 1721 if (nmdp < stop)/* early exit, it's a self reference */ 1722 continue; 1723 mod = modlist_lookup2(modname, verinfo); 1724 if (mod) { /* woohoo, it's loaded already */ 1725 lfdep = mod->container; 1726 lfdep->refs++; 1727 error = linker_file_add_dependency(lf, lfdep); 1728 if (error) 1729 break; 1730 continue; 1731 } 1732 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 1733 if (error) { 1734 printf("KLD %s: depends on %s - not available\n", 1735 lf->filename, modname); 1736 break; 1737 } 1738 } 1739 1740 if (error) 1741 return (error); 1742 linker_addmodules(lf, start, stop, 0); 1743 return (error); 1744} 1745 1746static int 1747sysctl_kern_function_list_iterate(const char *name, void *opaque) 1748{ 1749 struct sysctl_req *req; 1750 1751 req = opaque; 1752 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 1753} 1754 1755/* 1756 * Export a nul-separated, double-nul-terminated list of all function names 1757 * in the kernel. 1758 */ 1759static int 1760sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 1761{ 1762 linker_file_t lf; 1763 int error; 1764 1765 TAILQ_FOREACH(lf, &linker_files, link) { 1766 error = LINKER_EACH_FUNCTION_NAME(lf, 1767 sysctl_kern_function_list_iterate, req); 1768 if (error) 1769 return (error); 1770 } 1771 return (SYSCTL_OUT(req, "", 1)); 1772} 1773 1774SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD, 1775 NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 1776