kern_linker.c revision 91040
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 91040 2002-02-22 04:14:49Z arr $ 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 error = ENOEXEC; /* Format not recognised (or unloadable) */ 346 else 347 error = ENOENT; /* Nothing found */ 348out: 349 return (error); 350} 351 352/* XXX: function parameters are incomplete */ 353int 354linker_reference_module(const char *modname, linker_file_t *result) 355{ 356 return (linker_load_module(NULL, modname, NULL, NULL, result)); 357} 358 359linker_file_t 360linker_find_file_by_name(const char *filename) 361{ 362 linker_file_t lf = 0; 363 char *koname; 364 int err; 365 366 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 367 if (koname == NULL) 368 goto out; 369 sprintf(koname, "%s.ko", filename); 370 371 lockmgr(&lock, LK_SHARED, 0, curthread); 372 TAILQ_FOREACH(lf, &linker_files, link) { 373 err = strcmp(lf->filename, koname); 374 if (err == 0) 375 break; 376 err = strcmp(lf->filename, filename); 377 if (err == 0) 378 break; 379 } 380 lockmgr(&lock, LK_RELEASE, 0, curthread); 381out: 382 if (koname) 383 free(koname, M_LINKER); 384 return (lf); 385} 386 387linker_file_t 388linker_find_file_by_id(int fileid) 389{ 390 linker_file_t lf = 0; 391 392 lockmgr(&lock, LK_SHARED, 0, curthread); 393 TAILQ_FOREACH(lf, &linker_files, link) 394 if (lf->id == fileid) 395 break; 396 lockmgr(&lock, LK_RELEASE, 0, curthread); 397 return (lf); 398} 399 400linker_file_t 401linker_make_file(const char *pathname, linker_class_t lc) 402{ 403 linker_file_t lf; 404 const char *filename; 405 406 lf = NULL; 407 filename = linker_basename(pathname); 408 409 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 410 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread); 411 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 412 if (lf == NULL) 413 goto out; 414 lf->refs = 1; 415 lf->userrefs = 0; 416 lf->flags = 0; 417 lf->filename = linker_strdup(filename); 418 LINKER_GET_NEXT_FILE_ID(lf->id); 419 lf->ndeps = 0; 420 lf->deps = NULL; 421 STAILQ_INIT(&lf->common); 422 TAILQ_INIT(&lf->modules); 423 TAILQ_INSERT_TAIL(&linker_files, lf, link); 424out: 425 lockmgr(&lock, LK_RELEASE, 0, curthread); 426 return (lf); 427} 428 429int 430linker_file_unload(linker_file_t file) 431{ 432 module_t mod, next; 433 modlist_t ml, nextml; 434 struct common_symbol *cp; 435 int error, i; 436 437 error = 0; 438 439 /* Refuse to unload modules if securelevel raised. */ 440 if (securelevel > 0) 441 return (EPERM); 442 443 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 444 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread); 445 if (file->refs == 1) { 446 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 447 " informing modules\n")); 448 449 /* 450 * Inform any modules associated with this file. 451 */ 452 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 453 next = module_getfnext(mod); 454 455 /* 456 * Give the module a chance to veto the unload. 457 */ 458 if ((error = module_unload(mod)) != 0) { 459 KLD_DPF(FILE, ("linker_file_unload: module %x" 460 " vetoes unload\n", mod)); 461 lockmgr(&lock, LK_RELEASE, 0, curthread); 462 goto out; 463 } 464 module_release(mod); 465 } 466 } 467 file->refs--; 468 if (file->refs > 0) { 469 lockmgr(&lock, LK_RELEASE, 0, curthread); 470 goto out; 471 } 472 for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) { 473 nextml = TAILQ_NEXT(ml, link); 474 if (ml->container == file) 475 TAILQ_REMOVE(&found_modules, ml, link); 476 } 477 478 /* 479 * Don't try to run SYSUNINITs if we are unloaded due to a 480 * link error. 481 */ 482 if (file->flags & LINKER_FILE_LINKED) { 483 linker_file_sysuninit(file); 484 linker_file_unregister_sysctls(file); 485 } 486 TAILQ_REMOVE(&linker_files, file, link); 487 lockmgr(&lock, LK_RELEASE, 0, curthread); 488 489 if (file->deps) { 490 for (i = 0; i < file->ndeps; i++) 491 linker_file_unload(file->deps[i]); 492 free(file->deps, M_LINKER); 493 file->deps = NULL; 494 } 495 for (cp = STAILQ_FIRST(&file->common); cp; 496 cp = STAILQ_FIRST(&file->common)) { 497 STAILQ_REMOVE(&file->common, cp, common_symbol, link); 498 free(cp, M_LINKER); 499 } 500 501 LINKER_UNLOAD(file); 502 if (file->filename) { 503 free(file->filename, M_LINKER); 504 file->filename = NULL; 505 } 506 kobj_delete((kobj_t) file, M_LINKER); 507out: 508 return (error); 509} 510 511int 512linker_file_add_dependency(linker_file_t file, linker_file_t dep) 513{ 514 linker_file_t *newdeps; 515 516 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 517 M_LINKER, M_WAITOK | M_ZERO); 518 if (newdeps == NULL) 519 return (ENOMEM); 520 521 if (file->deps) { 522 bcopy(file->deps, newdeps, 523 file->ndeps * sizeof(linker_file_t *)); 524 free(file->deps, M_LINKER); 525 } 526 file->deps = newdeps; 527 file->deps[file->ndeps] = dep; 528 file->ndeps++; 529 return (0); 530} 531 532/* 533 * Locate a linker set and its contents. This is a helper function to avoid 534 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void *** 535 */ 536int 537linker_file_lookup_set(linker_file_t file, const char *name, 538 void *firstp, void *lastp, int *countp) 539{ 540 541 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 542} 543 544caddr_t 545linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 546{ 547 c_linker_sym_t sym; 548 linker_symval_t symval; 549 caddr_t address; 550 size_t common_size = 0; 551 int err, i; 552 553 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n", 554 file, name, deps)); 555 556 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 557 LINKER_SYMBOL_VALUES(file, sym, &symval); 558 if (symval.value == 0) 559 /* 560 * For commons, first look them up in the 561 * dependencies and only allocate space if not found 562 * there. 563 */ 564 common_size = symval.size; 565 else { 566 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 567 ".value=%x\n", symval.value)); 568 return (symval.value); 569 } 570 } 571 if (deps) { 572 for (i = 0; i < file->ndeps; i++) { 573 address = linker_file_lookup_symbol(file->deps[i], 574 name, 0); 575 if (address) { 576 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 577 " deps value=%x\n", address)); 578 return (address); 579 } 580 } 581 } 582 if (common_size > 0) { 583 /* 584 * This is a common symbol which was not found in the 585 * dependencies. We maintain a simple common symbol table in 586 * the file object. 587 */ 588 struct common_symbol *cp; 589 590 STAILQ_FOREACH(cp, &file->common, link) { 591 err = strcmp(cp->name, name); 592 if (err == 0) { 593 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 594 " old common value=%x\n", cp->address)); 595 return (cp->address); 596 } 597 } 598 /* 599 * Round the symbol size up to align. 600 */ 601 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 602 cp = malloc(sizeof(struct common_symbol) 603 + common_size + strlen(name) + 1, M_LINKER, 604 M_WAITOK | M_ZERO); 605 if (cp == NULL) { 606 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 607 return (0); 608 } 609 cp->address = (caddr_t)(cp + 1); 610 cp->name = cp->address + common_size; 611 strcpy(cp->name, name); 612 bzero(cp->address, common_size); 613 STAILQ_INSERT_TAIL(&file->common, cp, link); 614 615 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 616 " value=%x\n", cp->address)); 617 return (cp->address); 618 } 619 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 620 return (0); 621} 622 623#ifdef DDB 624/* 625 * DDB Helpers. DDB has to look across multiple files with their own symbol 626 * tables and string tables. 627 * 628 * Note that we do not obey list locking protocols here. We really don't need 629 * DDB to hang because somebody's got the lock held. We'll take the chance 630 * that the files list is inconsistant instead. 631 */ 632 633int 634linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 635{ 636 linker_file_t lf; 637 638 TAILQ_FOREACH(lf, &linker_files, link) { 639 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 640 return (0); 641 } 642 return (ENOENT); 643} 644 645int 646linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 647{ 648 linker_file_t lf; 649 c_linker_sym_t best, es; 650 u_long diff, bestdiff, off; 651 652 best = 0; 653 off = (uintptr_t)value; 654 bestdiff = off; 655 TAILQ_FOREACH(lf, &linker_files, link) { 656 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 657 continue; 658 if (es != 0 && diff < bestdiff) { 659 best = es; 660 bestdiff = diff; 661 } 662 if (bestdiff == 0) 663 break; 664 } 665 if (best) { 666 *sym = best; 667 *diffp = bestdiff; 668 return (0); 669 } else { 670 *sym = 0; 671 *diffp = off; 672 return (ENOENT); 673 } 674} 675 676int 677linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 678{ 679 linker_file_t lf; 680 681 TAILQ_FOREACH(lf, &linker_files, link) { 682 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 683 return (0); 684 } 685 return (ENOENT); 686} 687#endif 688 689/* 690 * Syscalls. 691 */ 692/* 693 * MPSAFE 694 */ 695int 696kldload(struct thread *td, struct kldload_args *uap) 697{ 698 char *kldname, *modname; 699 char *pathname = NULL; 700 linker_file_t lf; 701 int error = 0; 702 703 td->td_retval[0] = -1; 704 705 if (securelevel > 0) /* redundant, but that's OK */ 706 return (EPERM); 707 708 mtx_lock(&Giant); 709 710 if ((error = suser_xxx(td->td_proc->p_ucred, NULL, 0)) != 0) 711 goto out; 712 713 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 714 if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 715 NULL)) != 0) 716 goto out; 717 718 /* 719 * If path do not contain qualified name or any dot in it 720 * (kldname.ko, or kldname.ver.ko) treat it as interface 721 * name. 722 */ 723 if (index(pathname, '/') || index(pathname, '.')) { 724 kldname = pathname; 725 modname = NULL; 726 } else { 727 kldname = NULL; 728 modname = pathname; 729 } 730 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 731 if (error) 732 goto out; 733 734 lf->userrefs++; 735 td->td_retval[0] = lf->id; 736out: 737 if (pathname) 738 free(pathname, M_TEMP); 739 mtx_unlock(&Giant); 740 return (error); 741} 742 743/* 744 * MPSAFE 745 */ 746int 747kldunload(struct thread *td, struct kldunload_args *uap) 748{ 749 linker_file_t lf; 750 int error = 0; 751 752 if (securelevel > 0) /* redundant, but that's OK */ 753 return (EPERM); 754 755 mtx_lock(&Giant); 756 757 if ((error = suser_xxx(td->td_proc->p_ucred, NULL, 0)) != 0) 758 goto out; 759 760 lf = linker_find_file_by_id(SCARG(uap, fileid)); 761 if (lf) { 762 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 763 if (lf->userrefs == 0) { 764 printf("kldunload: attempt to unload file that was" 765 " loaded by the kernel\n"); 766 error = EBUSY; 767 goto out; 768 } 769 lf->userrefs--; 770 error = linker_file_unload(lf); 771 if (error) 772 lf->userrefs++; 773 } else 774 error = ENOENT; 775out: 776 mtx_unlock(&Giant); 777 return (error); 778} 779 780/* 781 * MPSAFE 782 */ 783int 784kldfind(struct thread *td, struct kldfind_args *uap) 785{ 786 char *pathname; 787 const char *filename; 788 linker_file_t lf; 789 int error = 0; 790 791 mtx_lock(&Giant); 792 td->td_retval[0] = -1; 793 794 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 795 if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 796 NULL)) != 0) 797 goto out; 798 799 filename = linker_basename(pathname); 800 lf = linker_find_file_by_name(filename); 801 if (lf) 802 td->td_retval[0] = lf->id; 803 else 804 error = ENOENT; 805out: 806 if (pathname) 807 free(pathname, M_TEMP); 808 mtx_unlock(&Giant); 809 return (error); 810} 811 812/* 813 * MPSAFE 814 */ 815int 816kldnext(struct thread *td, struct kldnext_args *uap) 817{ 818 linker_file_t lf; 819 int error = 0; 820 821 mtx_lock(&Giant); 822 823 if (SCARG(uap, fileid) == 0) { 824 if (TAILQ_FIRST(&linker_files)) 825 td->td_retval[0] = TAILQ_FIRST(&linker_files)->id; 826 else 827 td->td_retval[0] = 0; 828 goto out; 829 } 830 lf = linker_find_file_by_id(SCARG(uap, fileid)); 831 if (lf) { 832 if (TAILQ_NEXT(lf, link)) 833 td->td_retval[0] = TAILQ_NEXT(lf, link)->id; 834 else 835 td->td_retval[0] = 0; 836 } else 837 error = ENOENT; 838out: 839 mtx_unlock(&Giant); 840 return (error); 841} 842 843/* 844 * MPSAFE 845 */ 846int 847kldstat(struct thread *td, struct kldstat_args *uap) 848{ 849 linker_file_t lf; 850 int error = 0; 851 int namelen, version; 852 struct kld_file_stat *stat; 853 854 mtx_lock(&Giant); 855 856 lf = linker_find_file_by_id(SCARG(uap, fileid)); 857 if (lf == NULL) { 858 error = ENOENT; 859 goto out; 860 } 861 stat = SCARG(uap, stat); 862 863 /* 864 * Check the version of the user's structure. 865 */ 866 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 867 goto out; 868 if (version != sizeof(struct kld_file_stat)) { 869 error = EINVAL; 870 goto out; 871 } 872 namelen = strlen(lf->filename) + 1; 873 if (namelen > MAXPATHLEN) 874 namelen = MAXPATHLEN; 875 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 876 goto out; 877 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 878 goto out; 879 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 880 goto out; 881 if ((error = copyout(&lf->address, &stat->address, 882 sizeof(caddr_t))) != 0) 883 goto out; 884 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 885 goto out; 886 887 td->td_retval[0] = 0; 888out: 889 mtx_unlock(&Giant); 890 return (error); 891} 892 893/* 894 * MPSAFE 895 */ 896int 897kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 898{ 899 linker_file_t lf; 900 module_t mp; 901 int error = 0; 902 903 mtx_lock(&Giant); 904 lf = linker_find_file_by_id(SCARG(uap, fileid)); 905 if (lf) { 906 mp = TAILQ_FIRST(&lf->modules); 907 if (mp != NULL) 908 td->td_retval[0] = module_getid(mp); 909 else 910 td->td_retval[0] = 0; 911 } else 912 error = ENOENT; 913 mtx_unlock(&Giant); 914 return (error); 915} 916 917/* 918 * MPSAFE 919 */ 920int 921kldsym(struct thread *td, struct kldsym_args *uap) 922{ 923 char *symstr = NULL; 924 c_linker_sym_t sym; 925 linker_symval_t symval; 926 linker_file_t lf; 927 struct kld_sym_lookup lookup; 928 int error = 0; 929 930 mtx_lock(&Giant); 931 932 if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0) 933 goto out; 934 if (lookup.version != sizeof(lookup) || 935 SCARG(uap, cmd) != KLDSYM_LOOKUP) { 936 error = EINVAL; 937 goto out; 938 } 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; 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 error = strcmp(modname, nmodname); 1193 if (error == 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, 1375 td->td_proc->p_ucred, td); 1376 VOP_UNLOCK(nd.ni_vp, 0, td); 1377 vn_close(nd.ni_vp, FREAD, td->td_proc->p_ucred, td); 1378 if (type == VREG) 1379 return (result); 1380 } 1381 } 1382 free(result, M_LINKER); 1383 return (NULL); 1384} 1385 1386#define INT_ALIGN(base, ptr) ptr = \ 1387 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 1388 1389/* 1390 * Lookup KLD which contains requested module in the "linker.hints" file. If 1391 * version specification is available, then try to find the best KLD. 1392 * Otherwise just find the latest one. 1393 * 1394 * XXX: Vnode locking here is hosed; lock should be held for calls to 1395 * VOP_GETATTR() and vn_rdwr(). 1396 */ 1397static char * 1398linker_hints_lookup(const char *path, int pathlen, const char *modname, 1399 int modnamelen, struct mod_depend *verinfo) 1400{ 1401 struct thread *td = curthread; /* XXX */ 1402 struct ucred *cred = td ? td->td_proc->p_ucred : NULL; 1403 struct nameidata nd; 1404 struct vattr vattr, mattr; 1405 u_char *hints = NULL; 1406 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1407 int error, ival, bestver, *intp, reclen, found, flags, clen, blen; 1408 1409 result = NULL; 1410 bestver = found = 0; 1411 1412 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1413 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1414 strlen(sep) + 1; 1415 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1416 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1417 linker_hintfile); 1418 1419 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1420 flags = FREAD; 1421 error = vn_open(&nd, &flags, 0); 1422 if (error) 1423 goto bad; 1424 NDFREE(&nd, NDF_ONLY_PNBUF); 1425 VOP_UNLOCK(nd.ni_vp, 0, td); 1426 if (nd.ni_vp->v_type != VREG) 1427 goto bad; 1428 best = cp = NULL; 1429 error = VOP_GETATTR(nd.ni_vp, &vattr, cred, td); 1430 if (error) 1431 goto bad; 1432 /* 1433 * XXX: we need to limit this number to some reasonable value 1434 */ 1435 if (vattr.va_size > 100 * 1024) { 1436 printf("hints file too large %ld\n", (long)vattr.va_size); 1437 goto bad; 1438 } 1439 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1440 if (hints == NULL) 1441 goto bad; 1442 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t) hints, vattr.va_size, 0, 1443 UIO_SYSSPACE, IO_NODELOCKED, cred, &reclen, td); 1444 if (error) 1445 goto bad; 1446 vn_close(nd.ni_vp, FREAD, cred, td); 1447 nd.ni_vp = NULL; 1448 if (reclen != 0) { 1449 printf("can't read %d\n", reclen); 1450 goto bad; 1451 } 1452 intp = (int *)hints; 1453 ival = *intp++; 1454 if (ival != LINKER_HINTS_VERSION) { 1455 printf("hints file version mismatch %d\n", ival); 1456 goto bad; 1457 } 1458 bufend = hints + vattr.va_size; 1459 recptr = (u_char *)intp; 1460 clen = blen = 0; 1461 while (recptr < bufend && !found) { 1462 intp = (int *)recptr; 1463 reclen = *intp++; 1464 ival = *intp++; 1465 cp = (char *)intp; 1466 switch (ival) { 1467 case MDT_VERSION: 1468 clen = *cp++; 1469 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1470 break; 1471 cp += clen; 1472 INT_ALIGN(hints, cp); 1473 ival = *(int *)cp; 1474 cp += sizeof(int); 1475 clen = *cp++; 1476 if (verinfo == NULL || 1477 ival == verinfo->md_ver_preferred) { 1478 found = 1; 1479 break; 1480 } 1481 if (ival >= verinfo->md_ver_minimum && 1482 ival <= verinfo->md_ver_maximum && 1483 ival > bestver) { 1484 bestver = ival; 1485 best = cp; 1486 blen = clen; 1487 } 1488 break; 1489 default: 1490 break; 1491 } 1492 recptr += reclen + sizeof(int); 1493 } 1494 /* 1495 * Finally check if KLD is in the place 1496 */ 1497 if (found) 1498 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1499 else if (best) 1500 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1501 1502 /* 1503 * KLD is newer than hints file. What we should do now? 1504 */ 1505 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1506 printf("warning: KLD '%s' is newer than the linker.hints" 1507 " file\n", result); 1508bad: 1509 if (hints) 1510 free(hints, M_TEMP); 1511 if (nd.ni_vp != NULL) 1512 vn_close(nd.ni_vp, FREAD, cred, td); 1513 /* 1514 * If nothing found or hints is absent - fallback to the old 1515 * way by using "kldname[.ko]" as module name. 1516 */ 1517 if (!found && !bestver && result == NULL) 1518 result = linker_lookup_file(path, pathlen, modname, 1519 modnamelen, NULL); 1520 return (result); 1521} 1522 1523/* 1524 * Lookup KLD which contains requested module in the all directories. 1525 */ 1526static char * 1527linker_search_module(const char *modname, int modnamelen, 1528 struct mod_depend *verinfo) 1529{ 1530 char *cp, *ep, *result; 1531 1532 /* 1533 * traverse the linker path 1534 */ 1535 for (cp = linker_path; *cp; cp = ep + 1) { 1536 /* find the end of this component */ 1537 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1538 result = linker_hints_lookup(cp, ep - cp, modname, 1539 modnamelen, verinfo); 1540 if (result != NULL) 1541 return (result); 1542 if (*ep == 0) 1543 break; 1544 } 1545 return (NULL); 1546} 1547 1548/* 1549 * Search for module in all directories listed in the linker_path. 1550 */ 1551static char * 1552linker_search_kld(const char *name) 1553{ 1554 char *cp, *ep, *result, **cpp; 1555 int extlen, len; 1556 1557 /* qualified at all? */ 1558 if (index(name, '/')) 1559 return (linker_strdup(name)); 1560 1561 extlen = 0; 1562 for (cpp = linker_ext_list; *cpp; cpp++) { 1563 len = strlen(*cpp); 1564 if (len > extlen) 1565 extlen = len; 1566 } 1567 extlen++; /* trailing '\0' */ 1568 1569 /* traverse the linker path */ 1570 len = strlen(name); 1571 for (ep = linker_path; *ep; ep++) { 1572 cp = ep; 1573 /* find the end of this component */ 1574 for (; *ep != 0 && *ep != ';'; ep++); 1575 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 1576 if (result != NULL) 1577 return (result); 1578 } 1579 return (NULL); 1580} 1581 1582static const char * 1583linker_basename(const char *path) 1584{ 1585 const char *filename; 1586 1587 filename = rindex(path, '/'); 1588 if (filename == NULL) 1589 return path; 1590 if (filename[1]) 1591 filename++; 1592 return (filename); 1593} 1594 1595/* 1596 * Find a file which contains given module and load it, if "parent" is not 1597 * NULL, register a reference to it. 1598 */ 1599static int 1600linker_load_module(const char *kldname, const char *modname, 1601 struct linker_file *parent, struct mod_depend *verinfo, 1602 struct linker_file **lfpp) 1603{ 1604 linker_file_t lfdep; 1605 const char *filename; 1606 char *pathname; 1607 int error; 1608 1609 if (modname == NULL) { 1610 /* 1611 * We have to load KLD 1612 */ 1613 KASSERT(verinfo == NULL, 1614 ("linker_load_module: verinfo is not NULL")); 1615 pathname = linker_search_kld(kldname); 1616 } else { 1617 if (modlist_lookup2(modname, verinfo) != NULL) 1618 return (EEXIST); 1619 if (kldname == NULL) 1620 /* 1621 * Need to find a KLD with required module 1622 */ 1623 pathname = linker_search_module(modname, 1624 strlen(modname), verinfo); 1625 else 1626 pathname = linker_strdup(kldname); 1627 } 1628 if (pathname == NULL) 1629 return (ENOENT); 1630 1631 /* 1632 * Can't load more than one file with the same basename XXX: 1633 * Actually it should be possible to have multiple KLDs with 1634 * the same basename but different path because they can 1635 * provide different versions of the same modules. 1636 */ 1637 filename = linker_basename(pathname); 1638 if (linker_find_file_by_name(filename)) { 1639 error = EEXIST; 1640 goto out; 1641 } 1642 do { 1643 error = linker_load_file(pathname, &lfdep); 1644 if (error) 1645 break; 1646 if (modname && verinfo && 1647 modlist_lookup2(modname, verinfo) == NULL) { 1648 linker_file_unload(lfdep); 1649 error = ENOENT; 1650 break; 1651 } 1652 if (parent) { 1653 error = linker_file_add_dependency(parent, lfdep); 1654 if (error) 1655 break; 1656 } 1657 if (lfpp) 1658 *lfpp = lfdep; 1659 } while (0); 1660out: 1661 if (pathname) 1662 free(pathname, M_LINKER); 1663 return (error); 1664} 1665 1666/* 1667 * This routine is responsible for finding dependencies of userland initiated 1668 * kldload(2)'s of files. 1669 */ 1670int 1671linker_load_dependencies(linker_file_t lf) 1672{ 1673 linker_file_t lfdep; 1674 struct mod_metadata **start, **stop, **mdp, **nmdp; 1675 struct mod_metadata *mp, *nmp; 1676 struct mod_depend *verinfo; 1677 modlist_t mod; 1678 const char *modname, *nmodname; 1679 int ver, error = 0, count; 1680 1681 /* 1682 * All files are dependant on /kernel. 1683 */ 1684 if (linker_kernel_file) { 1685 linker_kernel_file->refs++; 1686 error = linker_file_add_dependency(lf, linker_kernel_file); 1687 if (error) 1688 return (error); 1689 } 1690 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 1691 &count) != 0) 1692 return (0); 1693 for (mdp = start; mdp < stop; mdp++) { 1694 mp = linker_reloc_ptr(lf, *mdp); 1695 if (mp->md_type != MDT_VERSION) 1696 continue; 1697 linker_mdt_version(lf, mp, &modname, &ver); 1698 mod = modlist_lookup(modname, ver); 1699 if (mod != NULL) { 1700 printf("interface %s.%d already present in the KLD" 1701 " '%s'!\n", modname, ver, 1702 mod->container->filename); 1703 return (EEXIST); 1704 } 1705 } 1706 1707 for (mdp = start; mdp < stop; mdp++) { 1708 mp = linker_reloc_ptr(lf, *mdp); 1709 if (mp->md_type != MDT_DEPEND) 1710 continue; 1711 linker_mdt_depend(lf, mp, &modname, &verinfo); 1712 nmodname = NULL; 1713 for (nmdp = start; nmdp < stop; nmdp++) { 1714 nmp = linker_reloc_ptr(lf, *nmdp); 1715 if (nmp->md_type != MDT_VERSION) 1716 continue; 1717 nmodname = linker_reloc_ptr(lf, nmp->md_cval); 1718 error = strcmp(modname, nmodname); 1719 if (error == 0) 1720 break; 1721 } 1722 if (nmdp < stop)/* early exit, it's a self reference */ 1723 continue; 1724 mod = modlist_lookup2(modname, verinfo); 1725 if (mod) { /* woohoo, it's loaded already */ 1726 lfdep = mod->container; 1727 lfdep->refs++; 1728 error = linker_file_add_dependency(lf, lfdep); 1729 if (error) 1730 break; 1731 continue; 1732 } 1733 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 1734 if (error) { 1735 printf("KLD %s: depends on %s - not available\n", 1736 lf->filename, modname); 1737 break; 1738 } 1739 } 1740 1741 if (error) 1742 return (error); 1743 linker_addmodules(lf, start, stop, 0); 1744 return (error); 1745} 1746 1747static int 1748sysctl_kern_function_list_iterate(const char *name, void *opaque) 1749{ 1750 struct sysctl_req *req; 1751 1752 req = opaque; 1753 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 1754} 1755 1756/* 1757 * Export a nul-separated, double-nul-terminated list of all function names 1758 * in the kernel. 1759 */ 1760static int 1761sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 1762{ 1763 linker_file_t lf; 1764 int error; 1765 1766 TAILQ_FOREACH(lf, &linker_files, link) { 1767 error = LINKER_EACH_FUNCTION_NAME(lf, 1768 sysctl_kern_function_list_iterate, req); 1769 if (error) 1770 return (error); 1771 } 1772 return (SYSCTL_OUT(req, "", 1)); 1773} 1774 1775SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD, 1776 NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 1777