Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_linker.c
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1 /*- 2 * Copyright (c) 1997-2000 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/10.3/sys/kern/kern_linker.c 325878 2017-11-15 22:51:08Z gordon $"); 29 30 #include "opt_ddb.h" 31 #include "opt_kld.h" 32 #include "opt_hwpmc_hooks.h" 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/sysproto.h> 39 #include <sys/sysent.h> 40 #include <sys/priv.h> 41 #include <sys/proc.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/sx.h> 45 #include <sys/module.h> 46 #include <sys/mount.h> 47 #include <sys/linker.h> 48 #include <sys/eventhandler.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/libkern.h> 52 #include <sys/namei.h> 53 #include <sys/vnode.h> 54 #include <sys/syscallsubr.h> 55 #include <sys/sysctl.h> 56 57 #include <net/vnet.h> 58 59 #include <security/mac/mac_framework.h> 60 61 #include "linker_if.h" 62 63 #ifdef HWPMC_HOOKS 64 #include <sys/pmckern.h> 65 #endif 66 67 #ifdef KLD_DEBUG 68 int kld_debug = 0; 69 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RW | CTLFLAG_TUN, 70 &kld_debug, 0, "Set various levels of KLD debug"); 71 TUNABLE_INT("debug.kld_debug", &kld_debug); 72 #endif 73 74 /* These variables are used by kernel debuggers to enumerate loaded files. */ 75 const int kld_off_address = offsetof(struct linker_file, address); 76 const int kld_off_filename = offsetof(struct linker_file, filename); 77 const int kld_off_pathname = offsetof(struct linker_file, pathname); 78 const int kld_off_next = offsetof(struct linker_file, link.tqe_next); 79 80 /* 81 * static char *linker_search_path(const char *name, struct mod_depend 82 * *verinfo); 83 */ 84 static const char *linker_basename(const char *path); 85 86 /* 87 * Find a currently loaded file given its filename. 88 */ 89 static linker_file_t linker_find_file_by_name(const char* _filename); 90 91 /* 92 * Find a currently loaded file given its file id. 93 */ 94 static linker_file_t linker_find_file_by_id(int _fileid); 95 96 /* Metadata from the static kernel */ 97 SET_DECLARE(modmetadata_set, struct mod_metadata); 98 99 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 100 101 linker_file_t linker_kernel_file; 102 103 static struct sx kld_sx; /* kernel linker lock */ 104 105 /* 106 * Load counter used by clients to determine if a linker file has been 107 * re-loaded. This counter is incremented for each file load. 108 */ 109 static int loadcnt; 110 111 static linker_class_list_t classes; 112 static linker_file_list_t linker_files; 113 static int next_file_id = 1; 114 static int linker_no_more_classes = 0; 115 116 #define LINKER_GET_NEXT_FILE_ID(a) do { \ 117 linker_file_t lftmp; \ 118 \ 119 if (!cold) \ 120 sx_assert(&kld_sx, SA_XLOCKED); \ 121 retry: \ 122 TAILQ_FOREACH(lftmp, &linker_files, link) { \ 123 if (next_file_id == lftmp->id) { \ 124 next_file_id++; \ 125 goto retry; \ 126 } \ 127 } \ 128 (a) = next_file_id; \ 129 } while(0) 130 131 132 /* XXX wrong name; we're looking at version provision tags here, not modules */ 133 typedef TAILQ_HEAD(, modlist) modlisthead_t; 134 struct modlist { 135 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 136 linker_file_t container; 137 const char *name; 138 int version; 139 }; 140 typedef struct modlist *modlist_t; 141 static modlisthead_t found_modules; 142 143 static int linker_file_add_dependency(linker_file_t file, 144 linker_file_t dep); 145 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file, 146 const char* name, int deps); 147 static int linker_load_module(const char *kldname, 148 const char *modname, struct linker_file *parent, 149 struct mod_depend *verinfo, struct linker_file **lfpp); 150 static modlist_t modlist_lookup2(const char *name, struct mod_depend *verinfo); 151 152 static void 153 linker_init(void *arg) 154 { 155 156 sx_init(&kld_sx, "kernel linker"); 157 TAILQ_INIT(&classes); 158 TAILQ_INIT(&linker_files); 159 } 160 161 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0); 162 163 static void 164 linker_stop_class_add(void *arg) 165 { 166 167 linker_no_more_classes = 1; 168 } 169 170 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL); 171 172 int 173 linker_add_class(linker_class_t lc) 174 { 175 176 /* 177 * We disallow any class registration past SI_ORDER_ANY 178 * of SI_SUB_KLD. We bump the reference count to keep the 179 * ops from being freed. 180 */ 181 if (linker_no_more_classes == 1) 182 return (EPERM); 183 kobj_class_compile((kobj_class_t) lc); 184 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */ 185 TAILQ_INSERT_TAIL(&classes, lc, link); 186 return (0); 187 } 188 189 static void 190 linker_file_sysinit(linker_file_t lf) 191 { 192 struct sysinit **start, **stop, **sipp, **xipp, *save; 193 194 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 195 lf->filename)); 196 197 sx_assert(&kld_sx, SA_XLOCKED); 198 199 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 200 return; 201 /* 202 * Perform a bubble sort of the system initialization objects by 203 * their subsystem (primary key) and order (secondary key). 204 * 205 * Since some things care about execution order, this is the operation 206 * which ensures continued function. 207 */ 208 for (sipp = start; sipp < stop; sipp++) { 209 for (xipp = sipp + 1; xipp < stop; xipp++) { 210 if ((*sipp)->subsystem < (*xipp)->subsystem || 211 ((*sipp)->subsystem == (*xipp)->subsystem && 212 (*sipp)->order <= (*xipp)->order)) 213 continue; /* skip */ 214 save = *sipp; 215 *sipp = *xipp; 216 *xipp = save; 217 } 218 } 219 220 /* 221 * Traverse the (now) ordered list of system initialization tasks. 222 * Perform each task, and continue on to the next task. 223 */ 224 sx_xunlock(&kld_sx); 225 mtx_lock(&Giant); 226 for (sipp = start; sipp < stop; sipp++) { 227 if ((*sipp)->subsystem == SI_SUB_DUMMY) 228 continue; /* skip dummy task(s) */ 229 230 /* Call function */ 231 (*((*sipp)->func)) ((*sipp)->udata); 232 } 233 mtx_unlock(&Giant); 234 sx_xlock(&kld_sx); 235 } 236 237 static void 238 linker_file_sysuninit(linker_file_t lf) 239 { 240 struct sysinit **start, **stop, **sipp, **xipp, *save; 241 242 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 243 lf->filename)); 244 245 sx_assert(&kld_sx, SA_XLOCKED); 246 247 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 248 NULL) != 0) 249 return; 250 251 /* 252 * Perform a reverse bubble sort of the system initialization objects 253 * by their subsystem (primary key) and order (secondary key). 254 * 255 * Since some things care about execution order, this is the operation 256 * which ensures continued function. 257 */ 258 for (sipp = start; sipp < stop; sipp++) { 259 for (xipp = sipp + 1; xipp < stop; xipp++) { 260 if ((*sipp)->subsystem > (*xipp)->subsystem || 261 ((*sipp)->subsystem == (*xipp)->subsystem && 262 (*sipp)->order >= (*xipp)->order)) 263 continue; /* skip */ 264 save = *sipp; 265 *sipp = *xipp; 266 *xipp = save; 267 } 268 } 269 270 /* 271 * Traverse the (now) ordered list of system initialization tasks. 272 * Perform each task, and continue on to the next task. 273 */ 274 sx_xunlock(&kld_sx); 275 mtx_lock(&Giant); 276 for (sipp = start; sipp < stop; sipp++) { 277 if ((*sipp)->subsystem == SI_SUB_DUMMY) 278 continue; /* skip dummy task(s) */ 279 280 /* Call function */ 281 (*((*sipp)->func)) ((*sipp)->udata); 282 } 283 mtx_unlock(&Giant); 284 sx_xlock(&kld_sx); 285 } 286 287 static void 288 linker_file_register_sysctls(linker_file_t lf) 289 { 290 struct sysctl_oid **start, **stop, **oidp; 291 292 KLD_DPF(FILE, 293 ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 294 lf->filename)); 295 296 sx_assert(&kld_sx, SA_XLOCKED); 297 298 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 299 return; 300 301 sx_xunlock(&kld_sx); 302 sysctl_lock(); 303 for (oidp = start; oidp < stop; oidp++) 304 sysctl_register_oid(*oidp); 305 sysctl_unlock(); 306 sx_xlock(&kld_sx); 307 } 308 309 static void 310 linker_file_unregister_sysctls(linker_file_t lf) 311 { 312 struct sysctl_oid **start, **stop, **oidp; 313 314 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs" 315 " for %s\n", lf->filename)); 316 317 sx_assert(&kld_sx, SA_XLOCKED); 318 319 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 320 return; 321 322 sx_xunlock(&kld_sx); 323 sysctl_lock(); 324 for (oidp = start; oidp < stop; oidp++) 325 sysctl_unregister_oid(*oidp); 326 sysctl_unlock(); 327 sx_xlock(&kld_sx); 328 } 329 330 static int 331 linker_file_register_modules(linker_file_t lf) 332 { 333 struct mod_metadata **start, **stop, **mdp; 334 const moduledata_t *moddata; 335 int first_error, error; 336 337 KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 338 " in %s\n", lf->filename)); 339 340 sx_assert(&kld_sx, SA_XLOCKED); 341 342 if (linker_file_lookup_set(lf, "modmetadata_set", &start, 343 &stop, NULL) != 0) { 344 /* 345 * This fallback should be unnecessary, but if we get booted 346 * from boot2 instead of loader and we are missing our 347 * metadata then we have to try the best we can. 348 */ 349 if (lf == linker_kernel_file) { 350 start = SET_BEGIN(modmetadata_set); 351 stop = SET_LIMIT(modmetadata_set); 352 } else 353 return (0); 354 } 355 first_error = 0; 356 for (mdp = start; mdp < stop; mdp++) { 357 if ((*mdp)->md_type != MDT_MODULE) 358 continue; 359 moddata = (*mdp)->md_data; 360 KLD_DPF(FILE, ("Registering module %s in %s\n", 361 moddata->name, lf->filename)); 362 error = module_register(moddata, lf); 363 if (error) { 364 printf("Module %s failed to register: %d\n", 365 moddata->name, error); 366 if (first_error == 0) 367 first_error = error; 368 } 369 } 370 return (first_error); 371 } 372 373 static void 374 linker_init_kernel_modules(void) 375 { 376 377 sx_xlock(&kld_sx); 378 linker_file_register_modules(linker_kernel_file); 379 sx_xunlock(&kld_sx); 380 } 381 382 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 383 0); 384 385 static int 386 linker_load_file(const char *filename, linker_file_t *result) 387 { 388 linker_class_t lc; 389 linker_file_t lf; 390 int foundfile, error, modules; 391 392 /* Refuse to load modules if securelevel raised */ 393 if (prison0.pr_securelevel > 0) 394 return (EPERM); 395 396 sx_assert(&kld_sx, SA_XLOCKED); 397 lf = linker_find_file_by_name(filename); 398 if (lf) { 399 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 400 " incrementing refs\n", filename)); 401 *result = lf; 402 lf->refs++; 403 return (0); 404 } 405 foundfile = 0; 406 error = 0; 407 408 /* 409 * We do not need to protect (lock) classes here because there is 410 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 411 * and there is no class deregistration mechanism at this time. 412 */ 413 TAILQ_FOREACH(lc, &classes, link) { 414 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 415 filename)); 416 error = LINKER_LOAD_FILE(lc, filename, &lf); 417 /* 418 * If we got something other than ENOENT, then it exists but 419 * we cannot load it for some other reason. 420 */ 421 if (error != ENOENT) 422 foundfile = 1; 423 if (lf) { 424 error = linker_file_register_modules(lf); 425 if (error == EEXIST) { 426 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 427 return (error); 428 } 429 modules = !TAILQ_EMPTY(&lf->modules); 430 linker_file_register_sysctls(lf); 431 linker_file_sysinit(lf); 432 lf->flags |= LINKER_FILE_LINKED; 433 434 /* 435 * If all of the modules in this file failed 436 * to load, unload the file and return an 437 * error of ENOEXEC. 438 */ 439 if (modules && TAILQ_EMPTY(&lf->modules)) { 440 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 441 return (ENOEXEC); 442 } 443 EVENTHANDLER_INVOKE(kld_load, lf); 444 *result = lf; 445 return (0); 446 } 447 } 448 /* 449 * Less than ideal, but tells the user whether it failed to load or 450 * the module was not found. 451 */ 452 if (foundfile) { 453 454 /* 455 * If the file type has not been recognized by the last try 456 * printout a message before to fail. 457 */ 458 if (error == ENOSYS) 459 printf("linker_load_file: Unsupported file type\n"); 460 461 /* 462 * Format not recognized or otherwise unloadable. 463 * When loading a module that is statically built into 464 * the kernel EEXIST percolates back up as the return 465 * value. Preserve this so that apps like sysinstall 466 * can recognize this special case and not post bogus 467 * dialog boxes. 468 */ 469 if (error != EEXIST) 470 error = ENOEXEC; 471 } else 472 error = ENOENT; /* Nothing found */ 473 return (error); 474 } 475 476 int 477 linker_reference_module(const char *modname, struct mod_depend *verinfo, 478 linker_file_t *result) 479 { 480 modlist_t mod; 481 int error; 482 483 sx_xlock(&kld_sx); 484 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 485 *result = mod->container; 486 (*result)->refs++; 487 sx_xunlock(&kld_sx); 488 return (0); 489 } 490 491 error = linker_load_module(NULL, modname, NULL, verinfo, result); 492 sx_xunlock(&kld_sx); 493 return (error); 494 } 495 496 int 497 linker_release_module(const char *modname, struct mod_depend *verinfo, 498 linker_file_t lf) 499 { 500 modlist_t mod; 501 int error; 502 503 sx_xlock(&kld_sx); 504 if (lf == NULL) { 505 KASSERT(modname != NULL, 506 ("linker_release_module: no file or name")); 507 mod = modlist_lookup2(modname, verinfo); 508 if (mod == NULL) { 509 sx_xunlock(&kld_sx); 510 return (ESRCH); 511 } 512 lf = mod->container; 513 } else 514 KASSERT(modname == NULL && verinfo == NULL, 515 ("linker_release_module: both file and name")); 516 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL); 517 sx_xunlock(&kld_sx); 518 return (error); 519 } 520 521 static linker_file_t 522 linker_find_file_by_name(const char *filename) 523 { 524 linker_file_t lf; 525 char *koname; 526 527 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 528 sprintf(koname, "%s.ko", filename); 529 530 sx_assert(&kld_sx, SA_XLOCKED); 531 TAILQ_FOREACH(lf, &linker_files, link) { 532 if (strcmp(lf->filename, koname) == 0) 533 break; 534 if (strcmp(lf->filename, filename) == 0) 535 break; 536 } 537 free(koname, M_LINKER); 538 return (lf); 539 } 540 541 static linker_file_t 542 linker_find_file_by_id(int fileid) 543 { 544 linker_file_t lf; 545 546 sx_assert(&kld_sx, SA_XLOCKED); 547 TAILQ_FOREACH(lf, &linker_files, link) 548 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED) 549 break; 550 return (lf); 551 } 552 553 int 554 linker_file_foreach(linker_predicate_t *predicate, void *context) 555 { 556 linker_file_t lf; 557 int retval = 0; 558 559 sx_xlock(&kld_sx); 560 TAILQ_FOREACH(lf, &linker_files, link) { 561 retval = predicate(lf, context); 562 if (retval != 0) 563 break; 564 } 565 sx_xunlock(&kld_sx); 566 return (retval); 567 } 568 569 linker_file_t 570 linker_make_file(const char *pathname, linker_class_t lc) 571 { 572 linker_file_t lf; 573 const char *filename; 574 575 if (!cold) 576 sx_assert(&kld_sx, SA_XLOCKED); 577 filename = linker_basename(pathname); 578 579 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname)); 580 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 581 if (lf == NULL) 582 return (NULL); 583 lf->refs = 1; 584 lf->userrefs = 0; 585 lf->flags = 0; 586 lf->filename = strdup(filename, M_LINKER); 587 lf->pathname = strdup(pathname, M_LINKER); 588 LINKER_GET_NEXT_FILE_ID(lf->id); 589 lf->ndeps = 0; 590 lf->deps = NULL; 591 lf->loadcnt = ++loadcnt; 592 STAILQ_INIT(&lf->common); 593 TAILQ_INIT(&lf->modules); 594 TAILQ_INSERT_TAIL(&linker_files, lf, link); 595 return (lf); 596 } 597 598 int 599 linker_file_unload(linker_file_t file, int flags) 600 { 601 module_t mod, next; 602 modlist_t ml, nextml; 603 struct common_symbol *cp; 604 int error, i; 605 606 /* Refuse to unload modules if securelevel raised. */ 607 if (prison0.pr_securelevel > 0) 608 return (EPERM); 609 610 sx_assert(&kld_sx, SA_XLOCKED); 611 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 612 613 /* Easy case of just dropping a reference. */ 614 if (file->refs > 1) { 615 file->refs--; 616 return (0); 617 } 618 619 /* Give eventhandlers a chance to prevent the unload. */ 620 error = 0; 621 EVENTHANDLER_INVOKE(kld_unload_try, file, &error); 622 if (error != 0) 623 return (EBUSY); 624 625 KLD_DPF(FILE, ("linker_file_unload: file is unloading," 626 " informing modules\n")); 627 628 /* 629 * Quiesce all the modules to give them a chance to veto the unload. 630 */ 631 MOD_SLOCK; 632 for (mod = TAILQ_FIRST(&file->modules); mod; 633 mod = module_getfnext(mod)) { 634 635 error = module_quiesce(mod); 636 if (error != 0 && flags != LINKER_UNLOAD_FORCE) { 637 KLD_DPF(FILE, ("linker_file_unload: module %s" 638 " vetoed unload\n", module_getname(mod))); 639 /* 640 * XXX: Do we need to tell all the quiesced modules 641 * that they can resume work now via a new module 642 * event? 643 */ 644 MOD_SUNLOCK; 645 return (error); 646 } 647 } 648 MOD_SUNLOCK; 649 650 /* 651 * Inform any modules associated with this file that they are 652 * being unloaded. 653 */ 654 MOD_XLOCK; 655 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 656 next = module_getfnext(mod); 657 MOD_XUNLOCK; 658 659 /* 660 * Give the module a chance to veto the unload. 661 */ 662 if ((error = module_unload(mod)) != 0) { 663 #ifdef KLD_DEBUG 664 MOD_SLOCK; 665 KLD_DPF(FILE, ("linker_file_unload: module %s" 666 " failed unload\n", module_getname(mod))); 667 MOD_SUNLOCK; 668 #endif 669 return (error); 670 } 671 MOD_XLOCK; 672 module_release(mod); 673 } 674 MOD_XUNLOCK; 675 676 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) { 677 if (ml->container == file) { 678 TAILQ_REMOVE(&found_modules, ml, link); 679 free(ml, M_LINKER); 680 } 681 } 682 683 /* 684 * Don't try to run SYSUNINITs if we are unloaded due to a 685 * link error. 686 */ 687 if (file->flags & LINKER_FILE_LINKED) { 688 file->flags &= ~LINKER_FILE_LINKED; 689 linker_file_sysuninit(file); 690 linker_file_unregister_sysctls(file); 691 } 692 TAILQ_REMOVE(&linker_files, file, link); 693 694 if (file->deps) { 695 for (i = 0; i < file->ndeps; i++) 696 linker_file_unload(file->deps[i], flags); 697 free(file->deps, M_LINKER); 698 file->deps = NULL; 699 } 700 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 701 STAILQ_REMOVE_HEAD(&file->common, link); 702 free(cp, M_LINKER); 703 } 704 705 LINKER_UNLOAD(file); 706 707 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address, 708 file->size); 709 710 if (file->filename) { 711 free(file->filename, M_LINKER); 712 file->filename = NULL; 713 } 714 if (file->pathname) { 715 free(file->pathname, M_LINKER); 716 file->pathname = NULL; 717 } 718 kobj_delete((kobj_t) file, M_LINKER); 719 return (0); 720 } 721 722 int 723 linker_ctf_get(linker_file_t file, linker_ctf_t *lc) 724 { 725 return (LINKER_CTF_GET(file, lc)); 726 } 727 728 static int 729 linker_file_add_dependency(linker_file_t file, linker_file_t dep) 730 { 731 linker_file_t *newdeps; 732 733 sx_assert(&kld_sx, SA_XLOCKED); 734 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps), 735 M_LINKER, M_WAITOK | M_ZERO); 736 file->deps[file->ndeps] = dep; 737 file->ndeps++; 738 KLD_DPF(FILE, ("linker_file_add_dependency:" 739 " adding %s as dependency for %s\n", 740 dep->filename, file->filename)); 741 return (0); 742 } 743 744 /* 745 * Locate a linker set and its contents. This is a helper function to avoid 746 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **. 747 * This function is used in this file so we can avoid having lots of (void **) 748 * casts. 749 */ 750 int 751 linker_file_lookup_set(linker_file_t file, const char *name, 752 void *firstp, void *lastp, int *countp) 753 { 754 755 sx_assert(&kld_sx, SA_LOCKED); 756 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 757 } 758 759 /* 760 * List all functions in a file. 761 */ 762 int 763 linker_file_function_listall(linker_file_t lf, 764 linker_function_nameval_callback_t callback_func, void *arg) 765 { 766 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg)); 767 } 768 769 caddr_t 770 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 771 { 772 caddr_t sym; 773 int locked; 774 775 locked = sx_xlocked(&kld_sx); 776 if (!locked) 777 sx_xlock(&kld_sx); 778 sym = linker_file_lookup_symbol_internal(file, name, deps); 779 if (!locked) 780 sx_xunlock(&kld_sx); 781 return (sym); 782 } 783 784 static caddr_t 785 linker_file_lookup_symbol_internal(linker_file_t file, const char *name, 786 int deps) 787 { 788 c_linker_sym_t sym; 789 linker_symval_t symval; 790 caddr_t address; 791 size_t common_size = 0; 792 int i; 793 794 sx_assert(&kld_sx, SA_XLOCKED); 795 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 796 file, name, deps)); 797 798 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 799 LINKER_SYMBOL_VALUES(file, sym, &symval); 800 if (symval.value == 0) 801 /* 802 * For commons, first look them up in the 803 * dependencies and only allocate space if not found 804 * there. 805 */ 806 common_size = symval.size; 807 else { 808 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 809 ".value=%p\n", symval.value)); 810 return (symval.value); 811 } 812 } 813 if (deps) { 814 for (i = 0; i < file->ndeps; i++) { 815 address = linker_file_lookup_symbol_internal( 816 file->deps[i], name, 0); 817 if (address) { 818 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 819 " deps value=%p\n", address)); 820 return (address); 821 } 822 } 823 } 824 if (common_size > 0) { 825 /* 826 * This is a common symbol which was not found in the 827 * dependencies. We maintain a simple common symbol table in 828 * the file object. 829 */ 830 struct common_symbol *cp; 831 832 STAILQ_FOREACH(cp, &file->common, link) { 833 if (strcmp(cp->name, name) == 0) { 834 KLD_DPF(SYM, ("linker_file_lookup_symbol:" 835 " old common value=%p\n", cp->address)); 836 return (cp->address); 837 } 838 } 839 /* 840 * Round the symbol size up to align. 841 */ 842 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 843 cp = malloc(sizeof(struct common_symbol) 844 + common_size + strlen(name) + 1, M_LINKER, 845 M_WAITOK | M_ZERO); 846 cp->address = (caddr_t)(cp + 1); 847 cp->name = cp->address + common_size; 848 strcpy(cp->name, name); 849 bzero(cp->address, common_size); 850 STAILQ_INSERT_TAIL(&file->common, cp, link); 851 852 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 853 " value=%p\n", cp->address)); 854 return (cp->address); 855 } 856 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 857 return (0); 858 } 859 860 /* 861 * Both DDB and stack(9) rely on the kernel linker to provide forward and 862 * backward lookup of symbols. However, DDB and sometimes stack(9) need to 863 * do this in a lockfree manner. We provide a set of internal helper 864 * routines to perform these operations without locks, and then wrappers that 865 * optionally lock. 866 * 867 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB. 868 */ 869 #ifdef DDB 870 static int 871 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym) 872 { 873 linker_file_t lf; 874 875 TAILQ_FOREACH(lf, &linker_files, link) { 876 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 877 return (0); 878 } 879 return (ENOENT); 880 } 881 #endif 882 883 static int 884 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 885 { 886 linker_file_t lf; 887 c_linker_sym_t best, es; 888 u_long diff, bestdiff, off; 889 890 best = 0; 891 off = (uintptr_t)value; 892 bestdiff = off; 893 TAILQ_FOREACH(lf, &linker_files, link) { 894 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 895 continue; 896 if (es != 0 && diff < bestdiff) { 897 best = es; 898 bestdiff = diff; 899 } 900 if (bestdiff == 0) 901 break; 902 } 903 if (best) { 904 *sym = best; 905 *diffp = bestdiff; 906 return (0); 907 } else { 908 *sym = 0; 909 *diffp = off; 910 return (ENOENT); 911 } 912 } 913 914 static int 915 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 916 { 917 linker_file_t lf; 918 919 TAILQ_FOREACH(lf, &linker_files, link) { 920 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 921 return (0); 922 } 923 return (ENOENT); 924 } 925 926 static int 927 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen, 928 long *offset) 929 { 930 linker_symval_t symval; 931 c_linker_sym_t sym; 932 int error; 933 934 *offset = 0; 935 error = linker_debug_search_symbol(value, &sym, offset); 936 if (error) 937 return (error); 938 error = linker_debug_symbol_values(sym, &symval); 939 if (error) 940 return (error); 941 strlcpy(buf, symval.name, buflen); 942 return (0); 943 } 944 945 /* 946 * DDB Helpers. DDB has to look across multiple files with their own symbol 947 * tables and string tables. 948 * 949 * Note that we do not obey list locking protocols here. We really don't need 950 * DDB to hang because somebody's got the lock held. We'll take the chance 951 * that the files list is inconsistant instead. 952 */ 953 #ifdef DDB 954 int 955 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 956 { 957 958 return (linker_debug_lookup(symstr, sym)); 959 } 960 #endif 961 962 int 963 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 964 { 965 966 return (linker_debug_search_symbol(value, sym, diffp)); 967 } 968 969 int 970 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 971 { 972 973 return (linker_debug_symbol_values(sym, symval)); 974 } 975 976 int 977 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, 978 long *offset) 979 { 980 981 return (linker_debug_search_symbol_name(value, buf, buflen, offset)); 982 } 983 984 /* 985 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do 986 * obey locking protocols, and offer a significantly less complex interface. 987 */ 988 int 989 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, 990 long *offset) 991 { 992 int error; 993 994 sx_xlock(&kld_sx); 995 error = linker_debug_search_symbol_name(value, buf, buflen, offset); 996 sx_xunlock(&kld_sx); 997 return (error); 998 } 999 1000 /* 1001 * Syscalls. 1002 */ 1003 int 1004 kern_kldload(struct thread *td, const char *file, int *fileid) 1005 { 1006 const char *kldname, *modname; 1007 linker_file_t lf; 1008 int error; 1009 1010 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1011 return (error); 1012 1013 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 1014 return (error); 1015 1016 /* 1017 * It is possible that kldloaded module will attach a new ifnet, 1018 * so vnet context must be set when this ocurs. 1019 */ 1020 CURVNET_SET(TD_TO_VNET(td)); 1021 1022 /* 1023 * If file does not contain a qualified name or any dot in it 1024 * (kldname.ko, or kldname.ver.ko) treat it as an interface 1025 * name. 1026 */ 1027 if (strchr(file, '/') || strchr(file, '.')) { 1028 kldname = file; 1029 modname = NULL; 1030 } else { 1031 kldname = NULL; 1032 modname = file; 1033 } 1034 1035 sx_xlock(&kld_sx); 1036 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 1037 if (error) { 1038 sx_xunlock(&kld_sx); 1039 goto done; 1040 } 1041 lf->userrefs++; 1042 if (fileid != NULL) 1043 *fileid = lf->id; 1044 sx_xunlock(&kld_sx); 1045 1046 done: 1047 CURVNET_RESTORE(); 1048 return (error); 1049 } 1050 1051 int 1052 sys_kldload(struct thread *td, struct kldload_args *uap) 1053 { 1054 char *pathname = NULL; 1055 int error, fileid; 1056 1057 td->td_retval[0] = -1; 1058 1059 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1060 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL); 1061 if (error == 0) { 1062 error = kern_kldload(td, pathname, &fileid); 1063 if (error == 0) 1064 td->td_retval[0] = fileid; 1065 } 1066 free(pathname, M_TEMP); 1067 return (error); 1068 } 1069 1070 int 1071 kern_kldunload(struct thread *td, int fileid, int flags) 1072 { 1073 linker_file_t lf; 1074 int error = 0; 1075 1076 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 1077 return (error); 1078 1079 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 1080 return (error); 1081 1082 CURVNET_SET(TD_TO_VNET(td)); 1083 sx_xlock(&kld_sx); 1084 lf = linker_find_file_by_id(fileid); 1085 if (lf) { 1086 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 1087 1088 if (lf->userrefs == 0) { 1089 /* 1090 * XXX: maybe LINKER_UNLOAD_FORCE should override ? 1091 */ 1092 printf("kldunload: attempt to unload file that was" 1093 " loaded by the kernel\n"); 1094 error = EBUSY; 1095 } else { 1096 lf->userrefs--; 1097 error = linker_file_unload(lf, flags); 1098 if (error) 1099 lf->userrefs++; 1100 } 1101 } else 1102 error = ENOENT; 1103 sx_xunlock(&kld_sx); 1104 1105 CURVNET_RESTORE(); 1106 return (error); 1107 } 1108 1109 int 1110 sys_kldunload(struct thread *td, struct kldunload_args *uap) 1111 { 1112 1113 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL)); 1114 } 1115 1116 int 1117 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap) 1118 { 1119 1120 if (uap->flags != LINKER_UNLOAD_NORMAL && 1121 uap->flags != LINKER_UNLOAD_FORCE) 1122 return (EINVAL); 1123 return (kern_kldunload(td, uap->fileid, uap->flags)); 1124 } 1125 1126 int 1127 sys_kldfind(struct thread *td, struct kldfind_args *uap) 1128 { 1129 char *pathname; 1130 const char *filename; 1131 linker_file_t lf; 1132 int error; 1133 1134 #ifdef MAC 1135 error = mac_kld_check_stat(td->td_ucred); 1136 if (error) 1137 return (error); 1138 #endif 1139 1140 td->td_retval[0] = -1; 1141 1142 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1143 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) 1144 goto out; 1145 1146 filename = linker_basename(pathname); 1147 sx_xlock(&kld_sx); 1148 lf = linker_find_file_by_name(filename); 1149 if (lf) 1150 td->td_retval[0] = lf->id; 1151 else 1152 error = ENOENT; 1153 sx_xunlock(&kld_sx); 1154 out: 1155 free(pathname, M_TEMP); 1156 return (error); 1157 } 1158 1159 int 1160 sys_kldnext(struct thread *td, struct kldnext_args *uap) 1161 { 1162 linker_file_t lf; 1163 int error = 0; 1164 1165 #ifdef MAC 1166 error = mac_kld_check_stat(td->td_ucred); 1167 if (error) 1168 return (error); 1169 #endif 1170 1171 sx_xlock(&kld_sx); 1172 if (uap->fileid == 0) 1173 lf = TAILQ_FIRST(&linker_files); 1174 else { 1175 lf = linker_find_file_by_id(uap->fileid); 1176 if (lf == NULL) { 1177 error = ENOENT; 1178 goto out; 1179 } 1180 lf = TAILQ_NEXT(lf, link); 1181 } 1182 1183 /* Skip partially loaded files. */ 1184 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) 1185 lf = TAILQ_NEXT(lf, link); 1186 1187 if (lf) 1188 td->td_retval[0] = lf->id; 1189 else 1190 td->td_retval[0] = 0; 1191 out: 1192 sx_xunlock(&kld_sx); 1193 return (error); 1194 } 1195 1196 int 1197 sys_kldstat(struct thread *td, struct kldstat_args *uap) 1198 { 1199 struct kld_file_stat *stat; 1200 int error, version; 1201 1202 /* 1203 * Check the version of the user's structure. 1204 */ 1205 if ((error = copyin(&uap->stat->version, &version, sizeof(version))) 1206 != 0) 1207 return (error); 1208 if (version != sizeof(struct kld_file_stat_1) && 1209 version != sizeof(struct kld_file_stat)) 1210 return (EINVAL); 1211 1212 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO); 1213 error = kern_kldstat(td, uap->fileid, stat); 1214 if (error == 0) 1215 error = copyout(stat, uap->stat, version); 1216 free(stat, M_TEMP); 1217 return (error); 1218 } 1219 1220 int 1221 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat) 1222 { 1223 linker_file_t lf; 1224 int namelen; 1225 #ifdef MAC 1226 int error; 1227 1228 error = mac_kld_check_stat(td->td_ucred); 1229 if (error) 1230 return (error); 1231 #endif 1232 1233 sx_xlock(&kld_sx); 1234 lf = linker_find_file_by_id(fileid); 1235 if (lf == NULL) { 1236 sx_xunlock(&kld_sx); 1237 return (ENOENT); 1238 } 1239 1240 /* Version 1 fields: */ 1241 namelen = strlen(lf->filename) + 1; 1242 if (namelen > MAXPATHLEN) 1243 namelen = MAXPATHLEN; 1244 bcopy(lf->filename, &stat->name[0], namelen); 1245 stat->refs = lf->refs; 1246 stat->id = lf->id; 1247 stat->address = lf->address; 1248 stat->size = lf->size; 1249 /* Version 2 fields: */ 1250 namelen = strlen(lf->pathname) + 1; 1251 if (namelen > MAXPATHLEN) 1252 namelen = MAXPATHLEN; 1253 bcopy(lf->pathname, &stat->pathname[0], namelen); 1254 sx_xunlock(&kld_sx); 1255 1256 td->td_retval[0] = 0; 1257 return (0); 1258 } 1259 1260 int 1261 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 1262 { 1263 linker_file_t lf; 1264 module_t mp; 1265 int error = 0; 1266 1267 #ifdef MAC 1268 error = mac_kld_check_stat(td->td_ucred); 1269 if (error) 1270 return (error); 1271 #endif 1272 1273 sx_xlock(&kld_sx); 1274 lf = linker_find_file_by_id(uap->fileid); 1275 if (lf) { 1276 MOD_SLOCK; 1277 mp = TAILQ_FIRST(&lf->modules); 1278 if (mp != NULL) 1279 td->td_retval[0] = module_getid(mp); 1280 else 1281 td->td_retval[0] = 0; 1282 MOD_SUNLOCK; 1283 } else 1284 error = ENOENT; 1285 sx_xunlock(&kld_sx); 1286 return (error); 1287 } 1288 1289 int 1290 sys_kldsym(struct thread *td, struct kldsym_args *uap) 1291 { 1292 char *symstr = NULL; 1293 c_linker_sym_t sym; 1294 linker_symval_t symval; 1295 linker_file_t lf; 1296 struct kld_sym_lookup lookup; 1297 int error = 0; 1298 1299 #ifdef MAC 1300 error = mac_kld_check_stat(td->td_ucred); 1301 if (error) 1302 return (error); 1303 #endif 1304 1305 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1306 return (error); 1307 if (lookup.version != sizeof(lookup) || 1308 uap->cmd != KLDSYM_LOOKUP) 1309 return (EINVAL); 1310 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1311 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1312 goto out; 1313 sx_xlock(&kld_sx); 1314 if (uap->fileid != 0) { 1315 lf = linker_find_file_by_id(uap->fileid); 1316 if (lf == NULL) 1317 error = ENOENT; 1318 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1319 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1320 lookup.symvalue = (uintptr_t) symval.value; 1321 lookup.symsize = symval.size; 1322 error = copyout(&lookup, uap->data, sizeof(lookup)); 1323 } else 1324 error = ENOENT; 1325 } else { 1326 TAILQ_FOREACH(lf, &linker_files, link) { 1327 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 1328 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 1329 lookup.symvalue = (uintptr_t)symval.value; 1330 lookup.symsize = symval.size; 1331 error = copyout(&lookup, uap->data, 1332 sizeof(lookup)); 1333 break; 1334 } 1335 } 1336 if (lf == NULL) 1337 error = ENOENT; 1338 } 1339 sx_xunlock(&kld_sx); 1340 out: 1341 free(symstr, M_TEMP); 1342 return (error); 1343 } 1344 1345 /* 1346 * Preloaded module support 1347 */ 1348 1349 static modlist_t 1350 modlist_lookup(const char *name, int ver) 1351 { 1352 modlist_t mod; 1353 1354 TAILQ_FOREACH(mod, &found_modules, link) { 1355 if (strcmp(mod->name, name) == 0 && 1356 (ver == 0 || mod->version == ver)) 1357 return (mod); 1358 } 1359 return (NULL); 1360 } 1361 1362 static modlist_t 1363 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1364 { 1365 modlist_t mod, bestmod; 1366 int ver; 1367 1368 if (verinfo == NULL) 1369 return (modlist_lookup(name, 0)); 1370 bestmod = NULL; 1371 TAILQ_FOREACH(mod, &found_modules, link) { 1372 if (strcmp(mod->name, name) != 0) 1373 continue; 1374 ver = mod->version; 1375 if (ver == verinfo->md_ver_preferred) 1376 return (mod); 1377 if (ver >= verinfo->md_ver_minimum && 1378 ver <= verinfo->md_ver_maximum && 1379 (bestmod == NULL || ver > bestmod->version)) 1380 bestmod = mod; 1381 } 1382 return (bestmod); 1383 } 1384 1385 static modlist_t 1386 modlist_newmodule(const char *modname, int version, linker_file_t container) 1387 { 1388 modlist_t mod; 1389 1390 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1391 if (mod == NULL) 1392 panic("no memory for module list"); 1393 mod->container = container; 1394 mod->name = modname; 1395 mod->version = version; 1396 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1397 return (mod); 1398 } 1399 1400 static void 1401 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1402 struct mod_metadata **stop, int preload) 1403 { 1404 struct mod_metadata *mp, **mdp; 1405 const char *modname; 1406 int ver; 1407 1408 for (mdp = start; mdp < stop; mdp++) { 1409 mp = *mdp; 1410 if (mp->md_type != MDT_VERSION) 1411 continue; 1412 modname = mp->md_cval; 1413 ver = ((struct mod_version *)mp->md_data)->mv_version; 1414 if (modlist_lookup(modname, ver) != NULL) { 1415 printf("module %s already present!\n", modname); 1416 /* XXX what can we do? this is a build error. :-( */ 1417 continue; 1418 } 1419 modlist_newmodule(modname, ver, lf); 1420 } 1421 } 1422 1423 static void 1424 linker_preload(void *arg) 1425 { 1426 caddr_t modptr; 1427 const char *modname, *nmodname; 1428 char *modtype; 1429 linker_file_t lf, nlf; 1430 linker_class_t lc; 1431 int error; 1432 linker_file_list_t loaded_files; 1433 linker_file_list_t depended_files; 1434 struct mod_metadata *mp, *nmp; 1435 struct mod_metadata **start, **stop, **mdp, **nmdp; 1436 struct mod_depend *verinfo; 1437 int nver; 1438 int resolves; 1439 modlist_t mod; 1440 struct sysinit **si_start, **si_stop; 1441 1442 TAILQ_INIT(&loaded_files); 1443 TAILQ_INIT(&depended_files); 1444 TAILQ_INIT(&found_modules); 1445 error = 0; 1446 1447 modptr = NULL; 1448 sx_xlock(&kld_sx); 1449 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1450 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1451 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1452 if (modname == NULL) { 1453 printf("Preloaded module at %p does not have a" 1454 " name!\n", modptr); 1455 continue; 1456 } 1457 if (modtype == NULL) { 1458 printf("Preloaded module at %p does not have a type!\n", 1459 modptr); 1460 continue; 1461 } 1462 if (bootverbose) 1463 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 1464 modptr); 1465 lf = NULL; 1466 TAILQ_FOREACH(lc, &classes, link) { 1467 error = LINKER_LINK_PRELOAD(lc, modname, &lf); 1468 if (!error) 1469 break; 1470 lf = NULL; 1471 } 1472 if (lf) 1473 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1474 } 1475 1476 /* 1477 * First get a list of stuff in the kernel. 1478 */ 1479 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1480 &stop, NULL) == 0) 1481 linker_addmodules(linker_kernel_file, start, stop, 1); 1482 1483 /* 1484 * This is a once-off kinky bubble sort to resolve relocation 1485 * dependency requirements. 1486 */ 1487 restart: 1488 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1489 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1490 &stop, NULL); 1491 /* 1492 * First, look to see if we would successfully link with this 1493 * stuff. 1494 */ 1495 resolves = 1; /* unless we know otherwise */ 1496 if (!error) { 1497 for (mdp = start; mdp < stop; mdp++) { 1498 mp = *mdp; 1499 if (mp->md_type != MDT_DEPEND) 1500 continue; 1501 modname = mp->md_cval; 1502 verinfo = mp->md_data; 1503 for (nmdp = start; nmdp < stop; nmdp++) { 1504 nmp = *nmdp; 1505 if (nmp->md_type != MDT_VERSION) 1506 continue; 1507 nmodname = nmp->md_cval; 1508 if (strcmp(modname, nmodname) == 0) 1509 break; 1510 } 1511 if (nmdp < stop) /* it's a self reference */ 1512 continue; 1513 1514 /* 1515 * ok, the module isn't here yet, we 1516 * are not finished 1517 */ 1518 if (modlist_lookup2(modname, verinfo) == NULL) 1519 resolves = 0; 1520 } 1521 } 1522 /* 1523 * OK, if we found our modules, we can link. So, "provide" 1524 * the modules inside and add it to the end of the link order 1525 * list. 1526 */ 1527 if (resolves) { 1528 if (!error) { 1529 for (mdp = start; mdp < stop; mdp++) { 1530 mp = *mdp; 1531 if (mp->md_type != MDT_VERSION) 1532 continue; 1533 modname = mp->md_cval; 1534 nver = ((struct mod_version *) 1535 mp->md_data)->mv_version; 1536 if (modlist_lookup(modname, 1537 nver) != NULL) { 1538 printf("module %s already" 1539 " present!\n", modname); 1540 TAILQ_REMOVE(&loaded_files, 1541 lf, loaded); 1542 linker_file_unload(lf, 1543 LINKER_UNLOAD_FORCE); 1544 /* we changed tailq next ptr */ 1545 goto restart; 1546 } 1547 modlist_newmodule(modname, nver, lf); 1548 } 1549 } 1550 TAILQ_REMOVE(&loaded_files, lf, loaded); 1551 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1552 /* 1553 * Since we provided modules, we need to restart the 1554 * sort so that the previous files that depend on us 1555 * have a chance. Also, we've busted the tailq next 1556 * pointer with the REMOVE. 1557 */ 1558 goto restart; 1559 } 1560 } 1561 1562 /* 1563 * At this point, we check to see what could not be resolved.. 1564 */ 1565 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1566 TAILQ_REMOVE(&loaded_files, lf, loaded); 1567 printf("KLD file %s is missing dependencies\n", lf->filename); 1568 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1569 } 1570 1571 /* 1572 * We made it. Finish off the linking in the order we determined. 1573 */ 1574 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) { 1575 if (linker_kernel_file) { 1576 linker_kernel_file->refs++; 1577 error = linker_file_add_dependency(lf, 1578 linker_kernel_file); 1579 if (error) 1580 panic("cannot add dependency"); 1581 } 1582 lf->userrefs++; /* so we can (try to) kldunload it */ 1583 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 1584 &stop, NULL); 1585 if (!error) { 1586 for (mdp = start; mdp < stop; mdp++) { 1587 mp = *mdp; 1588 if (mp->md_type != MDT_DEPEND) 1589 continue; 1590 modname = mp->md_cval; 1591 verinfo = mp->md_data; 1592 mod = modlist_lookup2(modname, verinfo); 1593 if (mod == NULL) { 1594 printf("KLD file %s - cannot find " 1595 "dependency \"%s\"\n", 1596 lf->filename, modname); 1597 goto fail; 1598 } 1599 /* Don't count self-dependencies */ 1600 if (lf == mod->container) 1601 continue; 1602 mod->container->refs++; 1603 error = linker_file_add_dependency(lf, 1604 mod->container); 1605 if (error) 1606 panic("cannot add dependency"); 1607 } 1608 } 1609 /* 1610 * Now do relocation etc using the symbol search paths 1611 * established by the dependencies 1612 */ 1613 error = LINKER_LINK_PRELOAD_FINISH(lf); 1614 if (error) { 1615 printf("KLD file %s - could not finalize loading\n", 1616 lf->filename); 1617 goto fail; 1618 } 1619 linker_file_register_modules(lf); 1620 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 1621 &si_stop, NULL) == 0) 1622 sysinit_add(si_start, si_stop); 1623 linker_file_register_sysctls(lf); 1624 lf->flags |= LINKER_FILE_LINKED; 1625 continue; 1626 fail: 1627 TAILQ_REMOVE(&depended_files, lf, loaded); 1628 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1629 } 1630 sx_xunlock(&kld_sx); 1631 /* woohoo! we made it! */ 1632 } 1633 1634 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1635 1636 /* 1637 * Search for a not-loaded module by name. 1638 * 1639 * Modules may be found in the following locations: 1640 * 1641 * - preloaded (result is just the module name) - on disk (result is full path 1642 * to module) 1643 * 1644 * If the module name is qualified in any way (contains path, etc.) the we 1645 * simply return a copy of it. 1646 * 1647 * The search path can be manipulated via sysctl. Note that we use the ';' 1648 * character as a separator to be consistent with the bootloader. 1649 */ 1650 1651 static char linker_hintfile[] = "linker.hints"; 1652 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules"; 1653 1654 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1655 sizeof(linker_path), "module load search path"); 1656 1657 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1658 1659 static char *linker_ext_list[] = { 1660 "", 1661 ".ko", 1662 NULL 1663 }; 1664 1665 /* 1666 * Check if file actually exists either with or without extension listed in 1667 * the linker_ext_list. (probably should be generic for the rest of the 1668 * kernel) 1669 */ 1670 static char * 1671 linker_lookup_file(const char *path, int pathlen, const char *name, 1672 int namelen, struct vattr *vap) 1673 { 1674 struct nameidata nd; 1675 struct thread *td = curthread; /* XXX */ 1676 char *result, **cpp, *sep; 1677 int error, len, extlen, reclen, flags; 1678 enum vtype type; 1679 1680 extlen = 0; 1681 for (cpp = linker_ext_list; *cpp; cpp++) { 1682 len = strlen(*cpp); 1683 if (len > extlen) 1684 extlen = len; 1685 } 1686 extlen++; /* trailing '\0' */ 1687 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1688 1689 reclen = pathlen + strlen(sep) + namelen + extlen + 1; 1690 result = malloc(reclen, M_LINKER, M_WAITOK); 1691 for (cpp = linker_ext_list; *cpp; cpp++) { 1692 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 1693 namelen, name, *cpp); 1694 /* 1695 * Attempt to open the file, and return the path if 1696 * we succeed and it's a regular file. 1697 */ 1698 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 1699 flags = FREAD; 1700 error = vn_open(&nd, &flags, 0, NULL); 1701 if (error == 0) { 1702 NDFREE(&nd, NDF_ONLY_PNBUF); 1703 type = nd.ni_vp->v_type; 1704 if (vap) 1705 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred); 1706 VOP_UNLOCK(nd.ni_vp, 0); 1707 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1708 if (type == VREG) 1709 return (result); 1710 } 1711 } 1712 free(result, M_LINKER); 1713 return (NULL); 1714 } 1715 1716 #define INT_ALIGN(base, ptr) ptr = \ 1717 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 1718 1719 /* 1720 * Lookup KLD which contains requested module in the "linker.hints" file. If 1721 * version specification is available, then try to find the best KLD. 1722 * Otherwise just find the latest one. 1723 */ 1724 static char * 1725 linker_hints_lookup(const char *path, int pathlen, const char *modname, 1726 int modnamelen, struct mod_depend *verinfo) 1727 { 1728 struct thread *td = curthread; /* XXX */ 1729 struct ucred *cred = td ? td->td_ucred : NULL; 1730 struct nameidata nd; 1731 struct vattr vattr, mattr; 1732 u_char *hints = NULL; 1733 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 1734 int error, ival, bestver, *intp, found, flags, clen, blen; 1735 ssize_t reclen; 1736 1737 result = NULL; 1738 bestver = found = 0; 1739 1740 sep = (path[pathlen - 1] != '/') ? "/" : ""; 1741 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 1742 strlen(sep) + 1; 1743 pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 1744 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 1745 linker_hintfile); 1746 1747 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 1748 flags = FREAD; 1749 error = vn_open(&nd, &flags, 0, NULL); 1750 if (error) 1751 goto bad; 1752 NDFREE(&nd, NDF_ONLY_PNBUF); 1753 if (nd.ni_vp->v_type != VREG) 1754 goto bad; 1755 best = cp = NULL; 1756 error = VOP_GETATTR(nd.ni_vp, &vattr, cred); 1757 if (error) 1758 goto bad; 1759 /* 1760 * XXX: we need to limit this number to some reasonable value 1761 */ 1762 if (vattr.va_size > 100 * 1024) { 1763 printf("hints file too large %ld\n", (long)vattr.va_size); 1764 goto bad; 1765 } 1766 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 1767 if (hints == NULL) 1768 goto bad; 1769 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1770 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 1771 if (error) 1772 goto bad; 1773 VOP_UNLOCK(nd.ni_vp, 0); 1774 vn_close(nd.ni_vp, FREAD, cred, td); 1775 nd.ni_vp = NULL; 1776 if (reclen != 0) { 1777 printf("can't read %zd\n", reclen); 1778 goto bad; 1779 } 1780 intp = (int *)hints; 1781 ival = *intp++; 1782 if (ival != LINKER_HINTS_VERSION) { 1783 printf("hints file version mismatch %d\n", ival); 1784 goto bad; 1785 } 1786 bufend = hints + vattr.va_size; 1787 recptr = (u_char *)intp; 1788 clen = blen = 0; 1789 while (recptr < bufend && !found) { 1790 intp = (int *)recptr; 1791 reclen = *intp++; 1792 ival = *intp++; 1793 cp = (char *)intp; 1794 switch (ival) { 1795 case MDT_VERSION: 1796 clen = *cp++; 1797 if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 1798 break; 1799 cp += clen; 1800 INT_ALIGN(hints, cp); 1801 ival = *(int *)cp; 1802 cp += sizeof(int); 1803 clen = *cp++; 1804 if (verinfo == NULL || 1805 ival == verinfo->md_ver_preferred) { 1806 found = 1; 1807 break; 1808 } 1809 if (ival >= verinfo->md_ver_minimum && 1810 ival <= verinfo->md_ver_maximum && 1811 ival > bestver) { 1812 bestver = ival; 1813 best = cp; 1814 blen = clen; 1815 } 1816 break; 1817 default: 1818 break; 1819 } 1820 recptr += reclen + sizeof(int); 1821 } 1822 /* 1823 * Finally check if KLD is in the place 1824 */ 1825 if (found) 1826 result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 1827 else if (best) 1828 result = linker_lookup_file(path, pathlen, best, blen, &mattr); 1829 1830 /* 1831 * KLD is newer than hints file. What we should do now? 1832 */ 1833 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 1834 printf("warning: KLD '%s' is newer than the linker.hints" 1835 " file\n", result); 1836 bad: 1837 free(pathbuf, M_LINKER); 1838 if (hints) 1839 free(hints, M_TEMP); 1840 if (nd.ni_vp != NULL) { 1841 VOP_UNLOCK(nd.ni_vp, 0); 1842 vn_close(nd.ni_vp, FREAD, cred, td); 1843 } 1844 /* 1845 * If nothing found or hints is absent - fallback to the old 1846 * way by using "kldname[.ko]" as module name. 1847 */ 1848 if (!found && !bestver && result == NULL) 1849 result = linker_lookup_file(path, pathlen, modname, 1850 modnamelen, NULL); 1851 return (result); 1852 } 1853 1854 /* 1855 * Lookup KLD which contains requested module in the all directories. 1856 */ 1857 static char * 1858 linker_search_module(const char *modname, int modnamelen, 1859 struct mod_depend *verinfo) 1860 { 1861 char *cp, *ep, *result; 1862 1863 /* 1864 * traverse the linker path 1865 */ 1866 for (cp = linker_path; *cp; cp = ep + 1) { 1867 /* find the end of this component */ 1868 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 1869 result = linker_hints_lookup(cp, ep - cp, modname, 1870 modnamelen, verinfo); 1871 if (result != NULL) 1872 return (result); 1873 if (*ep == 0) 1874 break; 1875 } 1876 return (NULL); 1877 } 1878 1879 /* 1880 * Search for module in all directories listed in the linker_path. 1881 */ 1882 static char * 1883 linker_search_kld(const char *name) 1884 { 1885 char *cp, *ep, *result; 1886 int len; 1887 1888 /* qualified at all? */ 1889 if (strchr(name, '/')) 1890 return (strdup(name, M_LINKER)); 1891 1892 /* traverse the linker path */ 1893 len = strlen(name); 1894 for (ep = linker_path; *ep; ep++) { 1895 cp = ep; 1896 /* find the end of this component */ 1897 for (; *ep != 0 && *ep != ';'; ep++); 1898 result = linker_lookup_file(cp, ep - cp, name, len, NULL); 1899 if (result != NULL) 1900 return (result); 1901 } 1902 return (NULL); 1903 } 1904 1905 static const char * 1906 linker_basename(const char *path) 1907 { 1908 const char *filename; 1909 1910 filename = strrchr(path, '/'); 1911 if (filename == NULL) 1912 return path; 1913 if (filename[1]) 1914 filename++; 1915 return (filename); 1916 } 1917 1918 #ifdef HWPMC_HOOKS 1919 /* 1920 * Inform hwpmc about the set of kernel modules currently loaded. 1921 */ 1922 void * 1923 linker_hwpmc_list_objects(void) 1924 { 1925 linker_file_t lf; 1926 struct pmckern_map_in *kobase; 1927 int i, nmappings; 1928 1929 nmappings = 0; 1930 sx_slock(&kld_sx); 1931 TAILQ_FOREACH(lf, &linker_files, link) 1932 nmappings++; 1933 1934 /* Allocate nmappings + 1 entries. */ 1935 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in), 1936 M_LINKER, M_WAITOK | M_ZERO); 1937 i = 0; 1938 TAILQ_FOREACH(lf, &linker_files, link) { 1939 1940 /* Save the info for this linker file. */ 1941 kobase[i].pm_file = lf->filename; 1942 kobase[i].pm_address = (uintptr_t)lf->address; 1943 i++; 1944 } 1945 sx_sunlock(&kld_sx); 1946 1947 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?")); 1948 1949 /* The last entry of the malloced area comprises of all zeros. */ 1950 KASSERT(kobase[i].pm_file == NULL, 1951 ("linker_hwpmc_list_objects: last object not NULL")); 1952 1953 return ((void *)kobase); 1954 } 1955 #endif 1956 1957 /* 1958 * Find a file which contains given module and load it, if "parent" is not 1959 * NULL, register a reference to it. 1960 */ 1961 static int 1962 linker_load_module(const char *kldname, const char *modname, 1963 struct linker_file *parent, struct mod_depend *verinfo, 1964 struct linker_file **lfpp) 1965 { 1966 linker_file_t lfdep; 1967 const char *filename; 1968 char *pathname; 1969 int error; 1970 1971 sx_assert(&kld_sx, SA_XLOCKED); 1972 if (modname == NULL) { 1973 /* 1974 * We have to load KLD 1975 */ 1976 KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 1977 " is not NULL")); 1978 pathname = linker_search_kld(kldname); 1979 } else { 1980 if (modlist_lookup2(modname, verinfo) != NULL) 1981 return (EEXIST); 1982 if (kldname != NULL) 1983 pathname = strdup(kldname, M_LINKER); 1984 else if (rootvnode == NULL) 1985 pathname = NULL; 1986 else 1987 /* 1988 * Need to find a KLD with required module 1989 */ 1990 pathname = linker_search_module(modname, 1991 strlen(modname), verinfo); 1992 } 1993 if (pathname == NULL) 1994 return (ENOENT); 1995 1996 /* 1997 * Can't load more than one file with the same basename XXX: 1998 * Actually it should be possible to have multiple KLDs with 1999 * the same basename but different path because they can 2000 * provide different versions of the same modules. 2001 */ 2002 filename = linker_basename(pathname); 2003 if (linker_find_file_by_name(filename)) 2004 error = EEXIST; 2005 else do { 2006 error = linker_load_file(pathname, &lfdep); 2007 if (error) 2008 break; 2009 if (modname && verinfo && 2010 modlist_lookup2(modname, verinfo) == NULL) { 2011 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE); 2012 error = ENOENT; 2013 break; 2014 } 2015 if (parent) { 2016 error = linker_file_add_dependency(parent, lfdep); 2017 if (error) 2018 break; 2019 } 2020 if (lfpp) 2021 *lfpp = lfdep; 2022 } while (0); 2023 free(pathname, M_LINKER); 2024 return (error); 2025 } 2026 2027 /* 2028 * This routine is responsible for finding dependencies of userland initiated 2029 * kldload(2)'s of files. 2030 */ 2031 int 2032 linker_load_dependencies(linker_file_t lf) 2033 { 2034 linker_file_t lfdep; 2035 struct mod_metadata **start, **stop, **mdp, **nmdp; 2036 struct mod_metadata *mp, *nmp; 2037 struct mod_depend *verinfo; 2038 modlist_t mod; 2039 const char *modname, *nmodname; 2040 int ver, error = 0, count; 2041 2042 /* 2043 * All files are dependant on /kernel. 2044 */ 2045 sx_assert(&kld_sx, SA_XLOCKED); 2046 if (linker_kernel_file) { 2047 linker_kernel_file->refs++; 2048 error = linker_file_add_dependency(lf, linker_kernel_file); 2049 if (error) 2050 return (error); 2051 } 2052 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 2053 &count) != 0) 2054 return (0); 2055 for (mdp = start; mdp < stop; mdp++) { 2056 mp = *mdp; 2057 if (mp->md_type != MDT_VERSION) 2058 continue; 2059 modname = mp->md_cval; 2060 ver = ((struct mod_version *)mp->md_data)->mv_version; 2061 mod = modlist_lookup(modname, ver); 2062 if (mod != NULL) { 2063 printf("interface %s.%d already present in the KLD" 2064 " '%s'!\n", modname, ver, 2065 mod->container->filename); 2066 return (EEXIST); 2067 } 2068 } 2069 2070 for (mdp = start; mdp < stop; mdp++) { 2071 mp = *mdp; 2072 if (mp->md_type != MDT_DEPEND) 2073 continue; 2074 modname = mp->md_cval; 2075 verinfo = mp->md_data; 2076 nmodname = NULL; 2077 for (nmdp = start; nmdp < stop; nmdp++) { 2078 nmp = *nmdp; 2079 if (nmp->md_type != MDT_VERSION) 2080 continue; 2081 nmodname = nmp->md_cval; 2082 if (strcmp(modname, nmodname) == 0) 2083 break; 2084 } 2085 if (nmdp < stop)/* early exit, it's a self reference */ 2086 continue; 2087 mod = modlist_lookup2(modname, verinfo); 2088 if (mod) { /* woohoo, it's loaded already */ 2089 lfdep = mod->container; 2090 lfdep->refs++; 2091 error = linker_file_add_dependency(lf, lfdep); 2092 if (error) 2093 break; 2094 continue; 2095 } 2096 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 2097 if (error) { 2098 printf("KLD %s: depends on %s - not available or" 2099 " version mismatch\n", lf->filename, modname); 2100 break; 2101 } 2102 } 2103 2104 if (error) 2105 return (error); 2106 linker_addmodules(lf, start, stop, 0); 2107 return (error); 2108 } 2109 2110 static int 2111 sysctl_kern_function_list_iterate(const char *name, void *opaque) 2112 { 2113 struct sysctl_req *req; 2114 2115 req = opaque; 2116 return (SYSCTL_OUT(req, name, strlen(name) + 1)); 2117 } 2118 2119 /* 2120 * Export a nul-separated, double-nul-terminated list of all function names 2121 * in the kernel. 2122 */ 2123 static int 2124 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 2125 { 2126 linker_file_t lf; 2127 int error; 2128 2129 #ifdef MAC 2130 error = mac_kld_check_stat(req->td->td_ucred); 2131 if (error) 2132 return (error); 2133 #endif 2134 error = sysctl_wire_old_buffer(req, 0); 2135 if (error != 0) 2136 return (error); 2137 sx_xlock(&kld_sx); 2138 TAILQ_FOREACH(lf, &linker_files, link) { 2139 error = LINKER_EACH_FUNCTION_NAME(lf, 2140 sysctl_kern_function_list_iterate, req); 2141 if (error) { 2142 sx_xunlock(&kld_sx); 2143 return (error); 2144 } 2145 } 2146 sx_xunlock(&kld_sx); 2147 return (SYSCTL_OUT(req, "", 1)); 2148 } 2149 2150 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD, 2151 NULL, 0, sysctl_kern_function_list, "", "kernel function list");
Cache object: dac576db7ba3040e431512ef9e63e611
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