kern_linker.c revision 44549
1/*- 2 * Copyright (c) 1997 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $Id: kern_linker.c,v 1.27 1999/02/20 21:22:00 dfr Exp $ 27 */ 28 29#include "opt_ddb.h" 30 31#include <sys/param.h> 32#include <sys/kernel.h> 33#include <sys/systm.h> 34#include <sys/malloc.h> 35#include <sys/sysproto.h> 36#include <sys/sysent.h> 37#include <sys/proc.h> 38#include <sys/lock.h> 39#include <machine/cpu.h> 40#include <machine/bootinfo.h> 41#include <sys/module.h> 42#include <sys/linker.h> 43#include <sys/unistd.h> 44#include <sys/fcntl.h> 45#include <sys/libkern.h> 46#include <sys/namei.h> 47#include <sys/vnode.h> 48#include <sys/sysctl.h> 49 50#ifdef KLD_DEBUG 51int kld_debug = 0; 52#endif 53 54MALLOC_DEFINE(M_LINKER, "kld", "kernel linker"); 55linker_file_t linker_current_file; 56linker_file_t linker_kernel_file; 57 58static struct lock lock; /* lock for the file list */ 59static linker_class_list_t classes; 60static linker_file_list_t files; 61static int next_file_id = 1; 62 63static void 64linker_init(void* arg) 65{ 66 lockinit(&lock, PVM, "klink", 0, 0); 67 TAILQ_INIT(&classes); 68 TAILQ_INIT(&files); 69} 70 71SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0); 72 73int 74linker_add_class(const char* desc, void* priv, 75 struct linker_class_ops* ops) 76{ 77 linker_class_t lc; 78 79 lc = malloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT); 80 if (!lc) 81 return ENOMEM; 82 bzero(lc, sizeof(*lc)); 83 84 lc->desc = desc; 85 lc->priv = priv; 86 lc->ops = ops; 87 TAILQ_INSERT_HEAD(&classes, lc, link); 88 89 return 0; 90} 91 92static void 93linker_file_sysinit(linker_file_t lf) 94{ 95 struct linker_set* sysinits; 96 struct sysinit** sipp; 97 struct sysinit** xipp; 98 struct sysinit* save; 99 moduledata_t *moddata; 100 101 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 102 lf->filename)); 103 104 sysinits = (struct linker_set*) 105 linker_file_lookup_symbol(lf, "sysinit_set", 0); 106 107 KLD_DPF(FILE, ("linker_file_sysinit: SYSINITs %p\n", sysinits)); 108 if (!sysinits) 109 return; 110 111 /* HACK ALERT! */ 112 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 113 if ((*sipp)->func == module_register_init) { 114 moddata = (*sipp)->udata; 115 moddata->_file = lf; 116 } 117 } 118 119 /* 120 * Perform a bubble sort of the system initialization objects by 121 * their subsystem (primary key) and order (secondary key). 122 * 123 * Since some things care about execution order, this is the 124 * operation which ensures continued function. 125 */ 126 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 127 for (xipp = sipp + 1; *xipp; xipp++) { 128 if ((*sipp)->subsystem <= (*xipp)->subsystem || 129 ((*sipp)->subsystem == (*xipp)->subsystem && 130 (*sipp)->order <= (*xipp)->order)) 131 continue; /* skip*/ 132 save = *sipp; 133 *sipp = *xipp; 134 *xipp = save; 135 } 136 } 137 138 139 /* 140 * Traverse the (now) ordered list of system initialization tasks. 141 * Perform each task, and continue on to the next task. 142 */ 143 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 144 if ((*sipp)->subsystem == SI_SUB_DUMMY) 145 continue; /* skip dummy task(s)*/ 146 147 switch ((*sipp)->type) { 148 case SI_TYPE_DEFAULT: 149 /* no special processing*/ 150 (*((*sipp)->func))((*sipp)->udata); 151 break; 152 153 case SI_TYPE_KTHREAD: 154#if !defined(SMP) 155 /* kernel thread*/ 156 if (fork1(&proc0, RFFDG|RFPROC|RFMEM)) 157 panic("fork kernel thread"); 158 cpu_set_fork_handler(pfind(proc0.p_retval[0]), 159 (*sipp)->func, (*sipp)->udata); 160 break; 161#endif 162 163 case SI_TYPE_KPROCESS: 164 /* kernel thread*/ 165 if (fork1(&proc0, RFFDG|RFPROC)) 166 panic("fork kernel process"); 167 cpu_set_fork_handler(pfind(proc0.p_retval[0]), 168 (*sipp)->func, (*sipp)->udata); 169 break; 170 171 default: 172 panic ("linker_file_sysinit: unrecognized init type"); 173 } 174 } 175} 176 177static void 178linker_file_sysuninit(linker_file_t lf) 179{ 180 struct linker_set* sysuninits; 181 struct sysinit** sipp; 182 struct sysinit** xipp; 183 struct sysinit* save; 184 185 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 186 lf->filename)); 187 188 sysuninits = (struct linker_set*) 189 linker_file_lookup_symbol(lf, "sysuninit_set", 0); 190 191 KLD_DPF(FILE, ("linker_file_sysuninit: SYSUNINITs %p\n", sysuninits)); 192 if (!sysuninits) 193 return; 194 195 /* 196 * Perform a reverse bubble sort of the system initialization objects 197 * by their subsystem (primary key) and order (secondary key). 198 * 199 * Since some things care about execution order, this is the 200 * operation which ensures continued function. 201 */ 202 for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) { 203 for (xipp = sipp + 1; *xipp; xipp++) { 204 if ((*sipp)->subsystem >= (*xipp)->subsystem || 205 ((*sipp)->subsystem == (*xipp)->subsystem && 206 (*sipp)->order >= (*xipp)->order)) 207 continue; /* skip*/ 208 save = *sipp; 209 *sipp = *xipp; 210 *xipp = save; 211 } 212 } 213 214 215 /* 216 * Traverse the (now) ordered list of system initialization tasks. 217 * Perform each task, and continue on to the next task. 218 */ 219 for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) { 220 if ((*sipp)->subsystem == SI_SUB_DUMMY) 221 continue; /* skip dummy task(s)*/ 222 223 switch ((*sipp)->type) { 224 case SI_TYPE_DEFAULT: 225 /* no special processing*/ 226 (*((*sipp)->func))((*sipp)->udata); 227 break; 228 229 default: 230 panic("linker_file_sysuninit: unrecognized uninit type"); 231 } 232 } 233} 234 235static void 236linker_file_register_sysctls(linker_file_t lf) 237{ 238 struct linker_set* sysctls; 239 240 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 241 lf->filename)); 242 243 sysctls = (struct linker_set*) 244 linker_file_lookup_symbol(lf, "sysctl_set", 0); 245 246 KLD_DPF(FILE, ("linker_file_register_sysctls: SYSCTLs %p\n", sysctls)); 247 if (!sysctls) 248 return; 249 250 sysctl_register_set(sysctls); 251} 252 253static void 254linker_file_unregister_sysctls(linker_file_t lf) 255{ 256 struct linker_set* sysctls; 257 258 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n", 259 lf->filename)); 260 261 sysctls = (struct linker_set*) 262 linker_file_lookup_symbol(lf, "sysctl_set", 0); 263 264 KLD_DPF(FILE, ("linker_file_unregister_sysctls: SYSCTLs %p\n", sysctls)); 265 if (!sysctls) 266 return; 267 268 sysctl_unregister_set(sysctls); 269} 270 271int 272linker_load_file(const char* filename, linker_file_t* result) 273{ 274 linker_class_t lc; 275 linker_file_t lf; 276 int foundfile, error = 0; 277 char *koname = NULL; 278 279 lf = linker_find_file_by_name(filename); 280 if (lf) { 281 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename)); 282 *result = lf; 283 lf->refs++; 284 goto out; 285 } 286 287 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 288 if (koname == NULL) { 289 error = ENOMEM; 290 goto out; 291 } 292 sprintf(koname, "%s.ko", filename); 293 lf = NULL; 294 foundfile = 0; 295 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) { 296 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n", 297 filename, lc->desc)); 298 299 error = lc->ops->load_file(koname, &lf); /* First with .ko */ 300 if (lf == NULL && error == ENOENT) 301 error = lc->ops->load_file(filename, &lf); /* Then try without */ 302 /* 303 * If we got something other than ENOENT, then it exists but we cannot 304 * load it for some other reason. 305 */ 306 if (error != ENOENT) 307 foundfile = 1; 308 if (lf) { 309 linker_file_register_sysctls(lf); 310 linker_file_sysinit(lf); 311 312 *result = lf; 313 error = 0; 314 goto out; 315 } 316 } 317 /* 318 * Less than ideal, but tells the user whether it failed to load or 319 * the module was not found. 320 */ 321 if (foundfile) 322 error = ENOEXEC; /* Format not recognised (or unloadable) */ 323 else 324 error = ENOENT; /* Nothing found */ 325 326out: 327 if (koname) 328 free(koname, M_LINKER); 329 return error; 330} 331 332linker_file_t 333linker_find_file_by_name(const char* filename) 334{ 335 linker_file_t lf = 0; 336 char *koname; 337 338 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 339 if (koname == NULL) 340 goto out; 341 sprintf(koname, "%s.ko", filename); 342 343 lockmgr(&lock, LK_SHARED, 0, curproc); 344 for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) { 345 if (!strcmp(lf->filename, koname)) 346 break; 347 if (!strcmp(lf->filename, filename)) 348 break; 349 } 350 lockmgr(&lock, LK_RELEASE, 0, curproc); 351 352out: 353 if (koname) 354 free(koname, M_LINKER); 355 return lf; 356} 357 358linker_file_t 359linker_find_file_by_id(int fileid) 360{ 361 linker_file_t lf = 0; 362 363 lockmgr(&lock, LK_SHARED, 0, curproc); 364 for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) 365 if (lf->id == fileid) 366 break; 367 lockmgr(&lock, LK_RELEASE, 0, curproc); 368 369 return lf; 370} 371 372linker_file_t 373linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops) 374{ 375 linker_file_t lf = 0; 376 int namelen; 377 const char *filename; 378 379 filename = rindex(pathname, '/'); 380 if (filename && filename[1]) 381 filename++; 382 else 383 filename = pathname; 384 385 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 386 lockmgr(&lock, LK_EXCLUSIVE|LK_RETRY, 0, curproc); 387 namelen = strlen(filename) + 1; 388 lf = malloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK); 389 if (!lf) 390 goto out; 391 bzero(lf, sizeof(*lf)); 392 393 lf->refs = 1; 394 lf->userrefs = 0; 395 lf->flags = 0; 396 lf->filename = (char*) (lf + 1); 397 strcpy(lf->filename, filename); 398 lf->id = next_file_id++; 399 lf->ndeps = 0; 400 lf->deps = NULL; 401 STAILQ_INIT(&lf->common); 402 TAILQ_INIT(&lf->modules); 403 404 lf->priv = priv; 405 lf->ops = ops; 406 TAILQ_INSERT_TAIL(&files, lf, link); 407 408out: 409 lockmgr(&lock, LK_RELEASE, 0, curproc); 410 return lf; 411} 412 413int 414linker_file_unload(linker_file_t file) 415{ 416 module_t mod, next; 417 struct common_symbol* cp; 418 int error = 0; 419 int i; 420 421 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 422 lockmgr(&lock, LK_EXCLUSIVE|LK_RETRY, 0, curproc); 423 if (file->refs == 1) { 424 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n")); 425 /* 426 * Inform any modules associated with this file. 427 */ 428 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 429 next = module_getfnext(mod); 430 431 /* 432 * Give the module a chance to veto the unload. 433 */ 434 if ((error = module_unload(mod)) != 0) { 435 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n", 436 mod)); 437 lockmgr(&lock, LK_RELEASE, 0, curproc); 438 goto out; 439 } 440 441 module_release(mod); 442 } 443 } 444 445 file->refs--; 446 if (file->refs > 0) { 447 lockmgr(&lock, LK_RELEASE, 0, curproc); 448 goto out; 449 } 450 451 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */ 452 if (file->flags & LINKER_FILE_LINKED) { 453 linker_file_sysuninit(file); 454 linker_file_unregister_sysctls(file); 455 } 456 457 TAILQ_REMOVE(&files, file, link); 458 lockmgr(&lock, LK_RELEASE, 0, curproc); 459 460 for (i = 0; i < file->ndeps; i++) 461 linker_file_unload(file->deps[i]); 462 free(file->deps, M_LINKER); 463 464 for (cp = STAILQ_FIRST(&file->common); cp; 465 cp = STAILQ_FIRST(&file->common)) { 466 STAILQ_REMOVE(&file->common, cp, common_symbol, link); 467 free(cp, M_LINKER); 468 } 469 470 file->ops->unload(file); 471 free(file, M_LINKER); 472 473out: 474 return error; 475} 476 477int 478linker_file_add_dependancy(linker_file_t file, linker_file_t dep) 479{ 480 linker_file_t* newdeps; 481 482 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*), 483 M_LINKER, M_WAITOK); 484 if (newdeps == NULL) 485 return ENOMEM; 486 bzero(newdeps, (file->ndeps + 1) * sizeof(linker_file_t*)); 487 488 if (file->deps) { 489 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*)); 490 free(file->deps, M_LINKER); 491 } 492 file->deps = newdeps; 493 file->deps[file->ndeps] = dep; 494 file->ndeps++; 495 496 return 0; 497} 498 499caddr_t 500linker_file_lookup_symbol(linker_file_t file, const char* name, int deps) 501{ 502 c_linker_sym_t sym; 503 linker_symval_t symval; 504 linker_file_t lf; 505 caddr_t address; 506 size_t common_size = 0; 507 int i; 508 509 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n", 510 file, name, deps)); 511 512 if (file->ops->lookup_symbol(file, name, &sym) == 0) { 513 file->ops->symbol_values(file, sym, &symval); 514 if (symval.value == 0) 515 /* 516 * For commons, first look them up in the dependancies and 517 * only allocate space if not found there. 518 */ 519 common_size = symval.size; 520 else { 521 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value)); 522 return symval.value; 523 } 524 } 525 526 if (deps) { 527 for (i = 0; i < file->ndeps; i++) { 528 address = linker_file_lookup_symbol(file->deps[i], name, 0); 529 if (address) { 530 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", address)); 531 return address; 532 } 533 } 534 535 /* If we have not found it in the dependencies, search globally */ 536 for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) { 537 /* But skip the current file if it's on the list */ 538 if (lf == file) 539 continue; 540 /* And skip the files we searched above */ 541 for (i = 0; i < file->ndeps; i++) 542 if (lf == file->deps[i]) 543 break; 544 if (i < file->ndeps) 545 continue; 546 address = linker_file_lookup_symbol(lf, name, 0); 547 if (address) { 548 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%x\n", address)); 549 return address; 550 } 551 } 552 } 553 554 if (common_size > 0) { 555 /* 556 * This is a common symbol which was not found in the 557 * dependancies. We maintain a simple common symbol table in 558 * the file object. 559 */ 560 struct common_symbol* cp; 561 562 for (cp = STAILQ_FIRST(&file->common); cp; 563 cp = STAILQ_NEXT(cp, link)) 564 if (!strcmp(cp->name, name)) { 565 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address)); 566 return cp->address; 567 } 568 569 /* 570 * Round the symbol size up to align. 571 */ 572 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 573 cp = malloc(sizeof(struct common_symbol) 574 + common_size 575 + strlen(name) + 1, 576 M_LINKER, M_WAITOK); 577 if (!cp) { 578 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 579 return 0; 580 } 581 bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1); 582 583 cp->address = (caddr_t) (cp + 1); 584 cp->name = cp->address + common_size; 585 strcpy(cp->name, name); 586 bzero(cp->address, common_size); 587 STAILQ_INSERT_TAIL(&file->common, cp, link); 588 589 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address)); 590 return cp->address; 591 } 592 593 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 594 return 0; 595} 596 597#ifdef DDB 598/* 599 * DDB Helpers. DDB has to look across multiple files with their own 600 * symbol tables and string tables. 601 * 602 * Note that we do not obey list locking protocols here. We really don't 603 * need DDB to hang because somebody's got the lock held. We'll take the 604 * chance that the files list is inconsistant instead. 605 */ 606 607int 608linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 609{ 610 linker_file_t lf; 611 612 for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) { 613 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0) 614 return 0; 615 } 616 return ENOENT; 617} 618 619int 620linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 621{ 622 linker_file_t lf; 623 u_long off = (u_long)value; 624 u_long diff, bestdiff; 625 c_linker_sym_t best; 626 c_linker_sym_t es; 627 628 best = 0; 629 bestdiff = off; 630 for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) { 631 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0) 632 continue; 633 if (es != 0 && diff < bestdiff) { 634 best = es; 635 bestdiff = diff; 636 } 637 if (bestdiff == 0) 638 break; 639 } 640 if (best) { 641 *sym = best; 642 *diffp = bestdiff; 643 return 0; 644 } else { 645 *sym = 0; 646 *diffp = off; 647 return ENOENT; 648 } 649} 650 651int 652linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 653{ 654 linker_file_t lf; 655 656 for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) { 657 if (lf->ops->symbol_values(lf, sym, symval) == 0) 658 return 0; 659 } 660 return ENOENT; 661} 662 663#endif 664 665/* 666 * Syscalls. 667 */ 668 669int 670kldload(struct proc* p, struct kldload_args* uap) 671{ 672 char* filename = NULL, *modulename; 673 linker_file_t lf; 674 int error = 0; 675 676 p->p_retval[0] = -1; 677 678 if (securelevel > 0) 679 return EPERM; 680 681 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 682 return error; 683 684 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 685 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0) 686 goto out; 687 688 /* Can't load more than one module with the same name */ 689 modulename = rindex(filename, '/'); 690 if (modulename == NULL) 691 modulename = filename; 692 else 693 modulename++; 694 if (linker_find_file_by_name(modulename)) { 695 error = EEXIST; 696 goto out; 697 } 698 699 if ((error = linker_load_file(filename, &lf)) != 0) 700 goto out; 701 702 lf->userrefs++; 703 p->p_retval[0] = lf->id; 704 705out: 706 if (filename) 707 free(filename, M_TEMP); 708 return error; 709} 710 711int 712kldunload(struct proc* p, struct kldunload_args* uap) 713{ 714 linker_file_t lf; 715 int error = 0; 716 717 if (securelevel > 0) 718 return EPERM; 719 720 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 721 return error; 722 723 lf = linker_find_file_by_id(SCARG(uap, fileid)); 724 if (lf) { 725 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 726 if (lf->userrefs == 0) { 727 printf("linkerunload: attempt to unload file that was loaded by the kernel\n"); 728 error = EBUSY; 729 goto out; 730 } 731 lf->userrefs--; 732 error = linker_file_unload(lf); 733 if (error) 734 lf->userrefs++; 735 } else 736 error = ENOENT; 737 738out: 739 return error; 740} 741 742int 743kldfind(struct proc* p, struct kldfind_args* uap) 744{ 745 char* filename = NULL, *modulename; 746 linker_file_t lf; 747 int error = 0; 748 749 p->p_retval[0] = -1; 750 751 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 752 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0) 753 goto out; 754 755 modulename = rindex(filename, '/'); 756 if (modulename == NULL) 757 modulename = filename; 758 759 lf = linker_find_file_by_name(modulename); 760 if (lf) 761 p->p_retval[0] = lf->id; 762 else 763 error = ENOENT; 764 765out: 766 if (filename) 767 free(filename, M_TEMP); 768 return error; 769} 770 771int 772kldnext(struct proc* p, struct kldnext_args* uap) 773{ 774 linker_file_t lf; 775 int error = 0; 776 777 if (SCARG(uap, fileid) == 0) { 778 if (TAILQ_FIRST(&files)) 779 p->p_retval[0] = TAILQ_FIRST(&files)->id; 780 else 781 p->p_retval[0] = 0; 782 return 0; 783 } 784 785 lf = linker_find_file_by_id(SCARG(uap, fileid)); 786 if (lf) { 787 if (TAILQ_NEXT(lf, link)) 788 p->p_retval[0] = TAILQ_NEXT(lf, link)->id; 789 else 790 p->p_retval[0] = 0; 791 } else 792 error = ENOENT; 793 794 return error; 795} 796 797int 798kldstat(struct proc* p, struct kldstat_args* uap) 799{ 800 linker_file_t lf; 801 int error = 0; 802 int version; 803 struct kld_file_stat* stat; 804 int namelen; 805 806 lf = linker_find_file_by_id(SCARG(uap, fileid)); 807 if (!lf) { 808 error = ENOENT; 809 goto out; 810 } 811 812 stat = SCARG(uap, stat); 813 814 /* 815 * Check the version of the user's structure. 816 */ 817 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 818 goto out; 819 if (version != sizeof(struct kld_file_stat)) { 820 error = EINVAL; 821 goto out; 822 } 823 824 namelen = strlen(lf->filename) + 1; 825 if (namelen > MAXPATHLEN) 826 namelen = MAXPATHLEN; 827 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 828 goto out; 829 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 830 goto out; 831 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 832 goto out; 833 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) 834 goto out; 835 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 836 goto out; 837 838 p->p_retval[0] = 0; 839 840out: 841 return error; 842} 843 844int 845kldfirstmod(struct proc* p, struct kldfirstmod_args* uap) 846{ 847 linker_file_t lf; 848 int error = 0; 849 850 lf = linker_find_file_by_id(SCARG(uap, fileid)); 851 if (lf) { 852 if (TAILQ_FIRST(&lf->modules)) 853 p->p_retval[0] = module_getid(TAILQ_FIRST(&lf->modules)); 854 else 855 p->p_retval[0] = 0; 856 } else 857 error = ENOENT; 858 859 return error; 860} 861 862int 863kldsym(struct proc *p, struct kldsym_args *uap) 864{ 865 char *symstr = NULL; 866 c_linker_sym_t sym; 867 linker_symval_t symval; 868 linker_file_t lf; 869 struct kld_sym_lookup lookup; 870 int error = 0; 871 872 if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0) 873 goto out; 874 if (lookup.version != sizeof(lookup) || SCARG(uap, cmd) != KLDSYM_LOOKUP) { 875 error = EINVAL; 876 goto out; 877 } 878 879 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 880 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 881 goto out; 882 883 if (SCARG(uap, fileid) != 0) { 884 lf = linker_find_file_by_id(SCARG(uap, fileid)); 885 if (lf == NULL) { 886 error = ENOENT; 887 goto out; 888 } 889 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 890 lf->ops->symbol_values(lf, sym, &symval) == 0) { 891 lookup.symvalue = (u_long)symval.value; 892 lookup.symsize = symval.size; 893 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup)); 894 } else 895 error = ENOENT; 896 } else { 897 for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) { 898 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 899 lf->ops->symbol_values(lf, sym, &symval) == 0) { 900 lookup.symvalue = (u_long)symval.value; 901 lookup.symsize = symval.size; 902 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup)); 903 break; 904 } 905 } 906 if (!lf) 907 error = ENOENT; 908 } 909out: 910 if (symstr) 911 free(symstr, M_TEMP); 912 return error; 913} 914 915/* 916 * Preloaded module support 917 */ 918 919static void 920linker_preload(void* arg) 921{ 922 caddr_t modptr; 923 char *modname; 924 char *modtype; 925 linker_file_t lf; 926 linker_class_t lc; 927 int error; 928 struct linker_set *sysinits; 929 struct sysinit **sipp; 930 moduledata_t *moddata; 931 932 modptr = NULL; 933 while ((modptr = preload_search_next_name(modptr)) != NULL) { 934 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 935 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 936 if (modname == NULL) { 937 printf("Preloaded module at %p does not have a name!\n", modptr); 938 continue; 939 } 940 if (modtype == NULL) { 941 printf("Preloaded module at %p does not have a type!\n", modptr); 942 continue; 943 } 944 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); 945 lf = linker_find_file_by_name(modname); 946 if (lf) { 947 lf->userrefs++; 948 continue; 949 } 950 lf = NULL; 951 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) { 952 error = lc->ops->load_file(modname, &lf); 953 if (error) { 954 lf = NULL; 955 break; 956 } 957 } 958 if (lf) { 959 lf->userrefs++; 960 961 sysinits = (struct linker_set*) 962 linker_file_lookup_symbol(lf, "sysinit_set", 0); 963 if (sysinits) { 964 /* HACK ALERT! 965 * This is to set the sysinit moduledata so that the module 966 * can attach itself to the correct containing file. 967 * The sysinit could be run at *any* time. 968 */ 969 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 970 if ((*sipp)->func == module_register_init) { 971 moddata = (*sipp)->udata; 972 moddata->_file = lf; 973 } 974 } 975 sysinit_add((struct sysinit **)sysinits->ls_items); 976 } 977 linker_file_register_sysctls(lf); 978 } 979 } 980} 981 982SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 983 984/* 985 * Search for a not-loaded module by name. 986 * 987 * Modules may be found in the following locations: 988 * 989 * - preloaded (result is just the module name) 990 * - on disk (result is full path to module) 991 * 992 * If the module name is qualified in any way (contains path, etc.) 993 * the we simply return a copy of it. 994 * 995 * The search path can be manipulated via sysctl. Note that we use the ';' 996 * character as a separator to be consistent with the bootloader. 997 */ 998 999static char linker_path[MAXPATHLEN + 1] = "/;/boot/;/modules/"; 1000 1001SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1002 sizeof(linker_path), "module load search path"); 1003 1004static char * 1005linker_strdup(const char *str) 1006{ 1007 char *result; 1008 1009 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 1010 strcpy(result, str); 1011 return(result); 1012} 1013 1014char * 1015linker_search_path(const char *name) 1016{ 1017 struct nameidata nd; 1018 struct proc *p = curproc; /* XXX */ 1019 char *cp, *ep, *result; 1020 int error; 1021 enum vtype type; 1022 1023 /* qualified at all? */ 1024 if (index(name, '/')) 1025 return(linker_strdup(name)); 1026 1027 /* traverse the linker path */ 1028 cp = linker_path; 1029 for (;;) { 1030 1031 /* find the end of this component */ 1032 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) 1033 ; 1034 result = malloc((strlen(name) + (ep - cp) + 1), M_LINKER, M_WAITOK); 1035 if (result == NULL) /* actually ENOMEM */ 1036 return(NULL); 1037 1038 strncpy(result, cp, ep - cp); 1039 strcpy(result + (ep - cp), name); 1040 1041 /* 1042 * Attempt to open the file, and return the path if we succeed and it's 1043 * a regular file. 1044 */ 1045 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, p); 1046 error = vn_open(&nd, FREAD, 0); 1047 if (error == 0) { 1048 type = nd.ni_vp->v_type; 1049 VOP_UNLOCK(nd.ni_vp, 0, p); 1050 vn_close(nd.ni_vp, FREAD, p->p_ucred, p); 1051 if (type == VREG) 1052 return(result); 1053 } 1054 free(result, M_LINKER); 1055 1056 if (*ep == 0) 1057 break; 1058 cp = ep + 1; 1059 } 1060 return(NULL); 1061} 1062