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("$FreeBSD$");
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, bool enable)
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 if (enable)
305 sysctl_register_oid(*oidp);
306 else
307 sysctl_register_disabled_oid(*oidp);
308 }
309 sysctl_unlock();
310 sx_xlock(&kld_sx);
311 }
312
313 static void
314 linker_file_enable_sysctls(linker_file_t lf)
315 {
316 struct sysctl_oid **start, **stop, **oidp;
317
318 KLD_DPF(FILE,
319 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n",
320 lf->filename));
321
322 sx_assert(&kld_sx, SA_XLOCKED);
323
324 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
325 return;
326
327 sx_xunlock(&kld_sx);
328 sysctl_lock();
329 for (oidp = start; oidp < stop; oidp++)
330 sysctl_enable_oid(*oidp);
331 sysctl_unlock();
332 sx_xlock(&kld_sx);
333 }
334
335 static void
336 linker_file_unregister_sysctls(linker_file_t lf)
337 {
338 struct sysctl_oid **start, **stop, **oidp;
339
340 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
341 " for %s\n", lf->filename));
342
343 sx_assert(&kld_sx, SA_XLOCKED);
344
345 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
346 return;
347
348 sx_xunlock(&kld_sx);
349 sysctl_lock();
350 for (oidp = start; oidp < stop; oidp++)
351 sysctl_unregister_oid(*oidp);
352 sysctl_unlock();
353 sx_xlock(&kld_sx);
354 }
355
356 static int
357 linker_file_register_modules(linker_file_t lf)
358 {
359 struct mod_metadata **start, **stop, **mdp;
360 const moduledata_t *moddata;
361 int first_error, error;
362
363 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
364 " in %s\n", lf->filename));
365
366 sx_assert(&kld_sx, SA_XLOCKED);
367
368 if (linker_file_lookup_set(lf, "modmetadata_set", &start,
369 &stop, NULL) != 0) {
370 /*
371 * This fallback should be unnecessary, but if we get booted
372 * from boot2 instead of loader and we are missing our
373 * metadata then we have to try the best we can.
374 */
375 if (lf == linker_kernel_file) {
376 start = SET_BEGIN(modmetadata_set);
377 stop = SET_LIMIT(modmetadata_set);
378 } else
379 return (0);
380 }
381 first_error = 0;
382 for (mdp = start; mdp < stop; mdp++) {
383 if ((*mdp)->md_type != MDT_MODULE)
384 continue;
385 moddata = (*mdp)->md_data;
386 KLD_DPF(FILE, ("Registering module %s in %s\n",
387 moddata->name, lf->filename));
388 error = module_register(moddata, lf);
389 if (error) {
390 printf("Module %s failed to register: %d\n",
391 moddata->name, error);
392 if (first_error == 0)
393 first_error = error;
394 }
395 }
396 return (first_error);
397 }
398
399 static void
400 linker_init_kernel_modules(void)
401 {
402
403 sx_xlock(&kld_sx);
404 linker_file_register_modules(linker_kernel_file);
405 sx_xunlock(&kld_sx);
406 }
407
408 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
409 0);
410
411 static int
412 linker_load_file(const char *filename, linker_file_t *result)
413 {
414 linker_class_t lc;
415 linker_file_t lf;
416 int foundfile, error, modules;
417
418 /* Refuse to load modules if securelevel raised */
419 if (prison0.pr_securelevel > 0)
420 return (EPERM);
421
422 sx_assert(&kld_sx, SA_XLOCKED);
423 lf = linker_find_file_by_name(filename);
424 if (lf) {
425 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
426 " incrementing refs\n", filename));
427 *result = lf;
428 lf->refs++;
429 return (0);
430 }
431 foundfile = 0;
432 error = 0;
433
434 /*
435 * We do not need to protect (lock) classes here because there is
436 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
437 * and there is no class deregistration mechanism at this time.
438 */
439 TAILQ_FOREACH(lc, &classes, link) {
440 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
441 filename));
442 error = LINKER_LOAD_FILE(lc, filename, &lf);
443 /*
444 * If we got something other than ENOENT, then it exists but
445 * we cannot load it for some other reason.
446 */
447 if (error != ENOENT)
448 foundfile = 1;
449 if (lf) {
450 error = linker_file_register_modules(lf);
451 if (error == EEXIST) {
452 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
453 return (error);
454 }
455 modules = !TAILQ_EMPTY(&lf->modules);
456 linker_file_register_sysctls(lf, false);
457 linker_file_sysinit(lf);
458 lf->flags |= LINKER_FILE_LINKED;
459
460 /*
461 * If all of the modules in this file failed
462 * to load, unload the file and return an
463 * error of ENOEXEC.
464 */
465 if (modules && TAILQ_EMPTY(&lf->modules)) {
466 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
467 return (ENOEXEC);
468 }
469 linker_file_enable_sysctls(lf);
470 EVENTHANDLER_INVOKE(kld_load, lf);
471 *result = lf;
472 return (0);
473 }
474 }
475 /*
476 * Less than ideal, but tells the user whether it failed to load or
477 * the module was not found.
478 */
479 if (foundfile) {
480
481 /*
482 * If the file type has not been recognized by the last try
483 * printout a message before to fail.
484 */
485 if (error == ENOSYS)
486 printf("linker_load_file: Unsupported file type\n");
487
488 /*
489 * Format not recognized or otherwise unloadable.
490 * When loading a module that is statically built into
491 * the kernel EEXIST percolates back up as the return
492 * value. Preserve this so that apps like sysinstall
493 * can recognize this special case and not post bogus
494 * dialog boxes.
495 */
496 if (error != EEXIST)
497 error = ENOEXEC;
498 } else
499 error = ENOENT; /* Nothing found */
500 return (error);
501 }
502
503 int
504 linker_reference_module(const char *modname, struct mod_depend *verinfo,
505 linker_file_t *result)
506 {
507 modlist_t mod;
508 int error;
509
510 sx_xlock(&kld_sx);
511 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
512 *result = mod->container;
513 (*result)->refs++;
514 sx_xunlock(&kld_sx);
515 return (0);
516 }
517
518 error = linker_load_module(NULL, modname, NULL, verinfo, result);
519 sx_xunlock(&kld_sx);
520 return (error);
521 }
522
523 int
524 linker_release_module(const char *modname, struct mod_depend *verinfo,
525 linker_file_t lf)
526 {
527 modlist_t mod;
528 int error;
529
530 sx_xlock(&kld_sx);
531 if (lf == NULL) {
532 KASSERT(modname != NULL,
533 ("linker_release_module: no file or name"));
534 mod = modlist_lookup2(modname, verinfo);
535 if (mod == NULL) {
536 sx_xunlock(&kld_sx);
537 return (ESRCH);
538 }
539 lf = mod->container;
540 } else
541 KASSERT(modname == NULL && verinfo == NULL,
542 ("linker_release_module: both file and name"));
543 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
544 sx_xunlock(&kld_sx);
545 return (error);
546 }
547
548 static linker_file_t
549 linker_find_file_by_name(const char *filename)
550 {
551 linker_file_t lf;
552 char *koname;
553
554 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
555 sprintf(koname, "%s.ko", filename);
556
557 sx_assert(&kld_sx, SA_XLOCKED);
558 TAILQ_FOREACH(lf, &linker_files, link) {
559 if (strcmp(lf->filename, koname) == 0)
560 break;
561 if (strcmp(lf->filename, filename) == 0)
562 break;
563 }
564 free(koname, M_LINKER);
565 return (lf);
566 }
567
568 static linker_file_t
569 linker_find_file_by_id(int fileid)
570 {
571 linker_file_t lf;
572
573 sx_assert(&kld_sx, SA_XLOCKED);
574 TAILQ_FOREACH(lf, &linker_files, link)
575 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
576 break;
577 return (lf);
578 }
579
580 int
581 linker_file_foreach(linker_predicate_t *predicate, void *context)
582 {
583 linker_file_t lf;
584 int retval = 0;
585
586 sx_xlock(&kld_sx);
587 TAILQ_FOREACH(lf, &linker_files, link) {
588 retval = predicate(lf, context);
589 if (retval != 0)
590 break;
591 }
592 sx_xunlock(&kld_sx);
593 return (retval);
594 }
595
596 linker_file_t
597 linker_make_file(const char *pathname, linker_class_t lc)
598 {
599 linker_file_t lf;
600 const char *filename;
601
602 if (!cold)
603 sx_assert(&kld_sx, SA_XLOCKED);
604 filename = linker_basename(pathname);
605
606 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
607 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
608 if (lf == NULL)
609 return (NULL);
610 lf->refs = 1;
611 lf->userrefs = 0;
612 lf->flags = 0;
613 lf->filename = strdup(filename, M_LINKER);
614 lf->pathname = strdup(pathname, M_LINKER);
615 LINKER_GET_NEXT_FILE_ID(lf->id);
616 lf->ndeps = 0;
617 lf->deps = NULL;
618 lf->loadcnt = ++loadcnt;
619 STAILQ_INIT(&lf->common);
620 TAILQ_INIT(&lf->modules);
621 TAILQ_INSERT_TAIL(&linker_files, lf, link);
622 return (lf);
623 }
624
625 int
626 linker_file_unload(linker_file_t file, int flags)
627 {
628 module_t mod, next;
629 modlist_t ml, nextml;
630 struct common_symbol *cp;
631 int error, i;
632
633 /* Refuse to unload modules if securelevel raised. */
634 if (prison0.pr_securelevel > 0)
635 return (EPERM);
636
637 sx_assert(&kld_sx, SA_XLOCKED);
638 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
639
640 /* Easy case of just dropping a reference. */
641 if (file->refs > 1) {
642 file->refs--;
643 return (0);
644 }
645
646 /* Give eventhandlers a chance to prevent the unload. */
647 error = 0;
648 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
649 if (error != 0)
650 return (EBUSY);
651
652 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
653 " informing modules\n"));
654
655 /*
656 * Quiesce all the modules to give them a chance to veto the unload.
657 */
658 MOD_SLOCK;
659 for (mod = TAILQ_FIRST(&file->modules); mod;
660 mod = module_getfnext(mod)) {
661
662 error = module_quiesce(mod);
663 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
664 KLD_DPF(FILE, ("linker_file_unload: module %s"
665 " vetoed unload\n", module_getname(mod)));
666 /*
667 * XXX: Do we need to tell all the quiesced modules
668 * that they can resume work now via a new module
669 * event?
670 */
671 MOD_SUNLOCK;
672 return (error);
673 }
674 }
675 MOD_SUNLOCK;
676
677 /*
678 * Inform any modules associated with this file that they are
679 * being unloaded.
680 */
681 MOD_XLOCK;
682 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
683 next = module_getfnext(mod);
684 MOD_XUNLOCK;
685
686 /*
687 * Give the module a chance to veto the unload.
688 */
689 if ((error = module_unload(mod)) != 0) {
690 #ifdef KLD_DEBUG
691 MOD_SLOCK;
692 KLD_DPF(FILE, ("linker_file_unload: module %s"
693 " failed unload\n", module_getname(mod)));
694 MOD_SUNLOCK;
695 #endif
696 return (error);
697 }
698 MOD_XLOCK;
699 module_release(mod);
700 }
701 MOD_XUNLOCK;
702
703 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
704 if (ml->container == file) {
705 TAILQ_REMOVE(&found_modules, ml, link);
706 free(ml, M_LINKER);
707 }
708 }
709
710 /*
711 * Don't try to run SYSUNINITs if we are unloaded due to a
712 * link error.
713 */
714 if (file->flags & LINKER_FILE_LINKED) {
715 file->flags &= ~LINKER_FILE_LINKED;
716 linker_file_unregister_sysctls(file);
717 linker_file_sysuninit(file);
718 }
719 TAILQ_REMOVE(&linker_files, file, link);
720
721 if (file->deps) {
722 for (i = 0; i < file->ndeps; i++)
723 linker_file_unload(file->deps[i], flags);
724 free(file->deps, M_LINKER);
725 file->deps = NULL;
726 }
727 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
728 STAILQ_REMOVE_HEAD(&file->common, link);
729 free(cp, M_LINKER);
730 }
731
732 LINKER_UNLOAD(file);
733
734 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
735 file->size);
736
737 if (file->filename) {
738 free(file->filename, M_LINKER);
739 file->filename = NULL;
740 }
741 if (file->pathname) {
742 free(file->pathname, M_LINKER);
743 file->pathname = NULL;
744 }
745 kobj_delete((kobj_t) file, M_LINKER);
746 return (0);
747 }
748
749 int
750 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
751 {
752 return (LINKER_CTF_GET(file, lc));
753 }
754
755 static int
756 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
757 {
758 linker_file_t *newdeps;
759
760 sx_assert(&kld_sx, SA_XLOCKED);
761 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
762 M_LINKER, M_WAITOK | M_ZERO);
763 file->deps[file->ndeps] = dep;
764 file->ndeps++;
765 KLD_DPF(FILE, ("linker_file_add_dependency:"
766 " adding %s as dependency for %s\n",
767 dep->filename, file->filename));
768 return (0);
769 }
770
771 /*
772 * Locate a linker set and its contents. This is a helper function to avoid
773 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
774 * This function is used in this file so we can avoid having lots of (void **)
775 * casts.
776 */
777 int
778 linker_file_lookup_set(linker_file_t file, const char *name,
779 void *firstp, void *lastp, int *countp)
780 {
781
782 sx_assert(&kld_sx, SA_LOCKED);
783 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
784 }
785
786 /*
787 * List all functions in a file.
788 */
789 int
790 linker_file_function_listall(linker_file_t lf,
791 linker_function_nameval_callback_t callback_func, void *arg)
792 {
793 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
794 }
795
796 caddr_t
797 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
798 {
799 caddr_t sym;
800 int locked;
801
802 locked = sx_xlocked(&kld_sx);
803 if (!locked)
804 sx_xlock(&kld_sx);
805 sym = linker_file_lookup_symbol_internal(file, name, deps);
806 if (!locked)
807 sx_xunlock(&kld_sx);
808 return (sym);
809 }
810
811 static caddr_t
812 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
813 int deps)
814 {
815 c_linker_sym_t sym;
816 linker_symval_t symval;
817 caddr_t address;
818 size_t common_size = 0;
819 int i;
820
821 sx_assert(&kld_sx, SA_XLOCKED);
822 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
823 file, name, deps));
824
825 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
826 LINKER_SYMBOL_VALUES(file, sym, &symval);
827 if (symval.value == 0)
828 /*
829 * For commons, first look them up in the
830 * dependencies and only allocate space if not found
831 * there.
832 */
833 common_size = symval.size;
834 else {
835 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
836 ".value=%p\n", symval.value));
837 return (symval.value);
838 }
839 }
840 if (deps) {
841 for (i = 0; i < file->ndeps; i++) {
842 address = linker_file_lookup_symbol_internal(
843 file->deps[i], name, 0);
844 if (address) {
845 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
846 " deps value=%p\n", address));
847 return (address);
848 }
849 }
850 }
851 if (common_size > 0) {
852 /*
853 * This is a common symbol which was not found in the
854 * dependencies. We maintain a simple common symbol table in
855 * the file object.
856 */
857 struct common_symbol *cp;
858
859 STAILQ_FOREACH(cp, &file->common, link) {
860 if (strcmp(cp->name, name) == 0) {
861 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
862 " old common value=%p\n", cp->address));
863 return (cp->address);
864 }
865 }
866 /*
867 * Round the symbol size up to align.
868 */
869 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
870 cp = malloc(sizeof(struct common_symbol)
871 + common_size + strlen(name) + 1, M_LINKER,
872 M_WAITOK | M_ZERO);
873 cp->address = (caddr_t)(cp + 1);
874 cp->name = cp->address + common_size;
875 strcpy(cp->name, name);
876 bzero(cp->address, common_size);
877 STAILQ_INSERT_TAIL(&file->common, cp, link);
878
879 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
880 " value=%p\n", cp->address));
881 return (cp->address);
882 }
883 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
884 return (0);
885 }
886
887 /*
888 * Both DDB and stack(9) rely on the kernel linker to provide forward and
889 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
890 * do this in a lockfree manner. We provide a set of internal helper
891 * routines to perform these operations without locks, and then wrappers that
892 * optionally lock.
893 *
894 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
895 */
896 #ifdef DDB
897 static int
898 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
899 {
900 linker_file_t lf;
901
902 TAILQ_FOREACH(lf, &linker_files, link) {
903 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
904 return (0);
905 }
906 return (ENOENT);
907 }
908 #endif
909
910 static int
911 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
912 {
913 linker_file_t lf;
914 c_linker_sym_t best, es;
915 u_long diff, bestdiff, off;
916
917 best = 0;
918 off = (uintptr_t)value;
919 bestdiff = off;
920 TAILQ_FOREACH(lf, &linker_files, link) {
921 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
922 continue;
923 if (es != 0 && diff < bestdiff) {
924 best = es;
925 bestdiff = diff;
926 }
927 if (bestdiff == 0)
928 break;
929 }
930 if (best) {
931 *sym = best;
932 *diffp = bestdiff;
933 return (0);
934 } else {
935 *sym = 0;
936 *diffp = off;
937 return (ENOENT);
938 }
939 }
940
941 static int
942 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
943 {
944 linker_file_t lf;
945
946 TAILQ_FOREACH(lf, &linker_files, link) {
947 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
948 return (0);
949 }
950 return (ENOENT);
951 }
952
953 static int
954 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
955 long *offset)
956 {
957 linker_symval_t symval;
958 c_linker_sym_t sym;
959 int error;
960
961 *offset = 0;
962 error = linker_debug_search_symbol(value, &sym, offset);
963 if (error)
964 return (error);
965 error = linker_debug_symbol_values(sym, &symval);
966 if (error)
967 return (error);
968 strlcpy(buf, symval.name, buflen);
969 return (0);
970 }
971
972 /*
973 * DDB Helpers. DDB has to look across multiple files with their own symbol
974 * tables and string tables.
975 *
976 * Note that we do not obey list locking protocols here. We really don't need
977 * DDB to hang because somebody's got the lock held. We'll take the chance
978 * that the files list is inconsistent instead.
979 */
980 #ifdef DDB
981 int
982 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
983 {
984
985 return (linker_debug_lookup(symstr, sym));
986 }
987 #endif
988
989 int
990 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
991 {
992
993 return (linker_debug_search_symbol(value, sym, diffp));
994 }
995
996 int
997 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
998 {
999
1000 return (linker_debug_symbol_values(sym, symval));
1001 }
1002
1003 int
1004 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1005 long *offset)
1006 {
1007
1008 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
1009 }
1010
1011 /*
1012 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
1013 * obey locking protocols, and offer a significantly less complex interface.
1014 */
1015 int
1016 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1017 long *offset)
1018 {
1019 int error;
1020
1021 sx_xlock(&kld_sx);
1022 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1023 sx_xunlock(&kld_sx);
1024 return (error);
1025 }
1026
1027 /*
1028 * Syscalls.
1029 */
1030 int
1031 kern_kldload(struct thread *td, const char *file, int *fileid)
1032 {
1033 const char *kldname, *modname;
1034 linker_file_t lf;
1035 int error;
1036
1037 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1038 return (error);
1039
1040 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1041 return (error);
1042
1043 /*
1044 * It is possible that kldloaded module will attach a new ifnet,
1045 * so vnet context must be set when this ocurs.
1046 */
1047 CURVNET_SET(TD_TO_VNET(td));
1048
1049 /*
1050 * If file does not contain a qualified name or any dot in it
1051 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1052 * name.
1053 */
1054 if (strchr(file, '/') || strchr(file, '.')) {
1055 kldname = file;
1056 modname = NULL;
1057 } else {
1058 kldname = NULL;
1059 modname = file;
1060 }
1061
1062 sx_xlock(&kld_sx);
1063 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1064 if (error) {
1065 sx_xunlock(&kld_sx);
1066 goto done;
1067 }
1068 lf->userrefs++;
1069 if (fileid != NULL)
1070 *fileid = lf->id;
1071 sx_xunlock(&kld_sx);
1072
1073 done:
1074 CURVNET_RESTORE();
1075 return (error);
1076 }
1077
1078 int
1079 sys_kldload(struct thread *td, struct kldload_args *uap)
1080 {
1081 char *pathname = NULL;
1082 int error, fileid;
1083
1084 td->td_retval[0] = -1;
1085
1086 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1087 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1088 if (error == 0) {
1089 error = kern_kldload(td, pathname, &fileid);
1090 if (error == 0)
1091 td->td_retval[0] = fileid;
1092 }
1093 free(pathname, M_TEMP);
1094 return (error);
1095 }
1096
1097 int
1098 kern_kldunload(struct thread *td, int fileid, int flags)
1099 {
1100 linker_file_t lf;
1101 int error = 0;
1102
1103 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1104 return (error);
1105
1106 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1107 return (error);
1108
1109 CURVNET_SET(TD_TO_VNET(td));
1110 sx_xlock(&kld_sx);
1111 lf = linker_find_file_by_id(fileid);
1112 if (lf) {
1113 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1114
1115 if (lf->userrefs == 0) {
1116 /*
1117 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1118 */
1119 printf("kldunload: attempt to unload file that was"
1120 " loaded by the kernel\n");
1121 error = EBUSY;
1122 } else {
1123 lf->userrefs--;
1124 error = linker_file_unload(lf, flags);
1125 if (error)
1126 lf->userrefs++;
1127 }
1128 } else
1129 error = ENOENT;
1130 sx_xunlock(&kld_sx);
1131
1132 CURVNET_RESTORE();
1133 return (error);
1134 }
1135
1136 int
1137 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1138 {
1139
1140 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1141 }
1142
1143 int
1144 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1145 {
1146
1147 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1148 uap->flags != LINKER_UNLOAD_FORCE)
1149 return (EINVAL);
1150 return (kern_kldunload(td, uap->fileid, uap->flags));
1151 }
1152
1153 int
1154 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1155 {
1156 char *pathname;
1157 const char *filename;
1158 linker_file_t lf;
1159 int error;
1160
1161 #ifdef MAC
1162 error = mac_kld_check_stat(td->td_ucred);
1163 if (error)
1164 return (error);
1165 #endif
1166
1167 td->td_retval[0] = -1;
1168
1169 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1170 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1171 goto out;
1172
1173 filename = linker_basename(pathname);
1174 sx_xlock(&kld_sx);
1175 lf = linker_find_file_by_name(filename);
1176 if (lf)
1177 td->td_retval[0] = lf->id;
1178 else
1179 error = ENOENT;
1180 sx_xunlock(&kld_sx);
1181 out:
1182 free(pathname, M_TEMP);
1183 return (error);
1184 }
1185
1186 int
1187 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1188 {
1189 linker_file_t lf;
1190 int error = 0;
1191
1192 #ifdef MAC
1193 error = mac_kld_check_stat(td->td_ucred);
1194 if (error)
1195 return (error);
1196 #endif
1197
1198 sx_xlock(&kld_sx);
1199 if (uap->fileid == 0)
1200 lf = TAILQ_FIRST(&linker_files);
1201 else {
1202 lf = linker_find_file_by_id(uap->fileid);
1203 if (lf == NULL) {
1204 error = ENOENT;
1205 goto out;
1206 }
1207 lf = TAILQ_NEXT(lf, link);
1208 }
1209
1210 /* Skip partially loaded files. */
1211 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1212 lf = TAILQ_NEXT(lf, link);
1213
1214 if (lf)
1215 td->td_retval[0] = lf->id;
1216 else
1217 td->td_retval[0] = 0;
1218 out:
1219 sx_xunlock(&kld_sx);
1220 return (error);
1221 }
1222
1223 int
1224 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1225 {
1226 struct kld_file_stat *stat;
1227 int error, version;
1228
1229 /*
1230 * Check the version of the user's structure.
1231 */
1232 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1233 != 0)
1234 return (error);
1235 if (version != sizeof(struct kld_file_stat_1) &&
1236 version != sizeof(struct kld_file_stat))
1237 return (EINVAL);
1238
1239 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1240 error = kern_kldstat(td, uap->fileid, stat);
1241 if (error == 0)
1242 error = copyout(stat, uap->stat, version);
1243 free(stat, M_TEMP);
1244 return (error);
1245 }
1246
1247 int
1248 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1249 {
1250 linker_file_t lf;
1251 int namelen;
1252 #ifdef MAC
1253 int error;
1254
1255 error = mac_kld_check_stat(td->td_ucred);
1256 if (error)
1257 return (error);
1258 #endif
1259
1260 sx_xlock(&kld_sx);
1261 lf = linker_find_file_by_id(fileid);
1262 if (lf == NULL) {
1263 sx_xunlock(&kld_sx);
1264 return (ENOENT);
1265 }
1266
1267 /* Version 1 fields: */
1268 namelen = strlen(lf->filename) + 1;
1269 if (namelen > MAXPATHLEN)
1270 namelen = MAXPATHLEN;
1271 bcopy(lf->filename, &stat->name[0], namelen);
1272 stat->refs = lf->refs;
1273 stat->id = lf->id;
1274 stat->address = lf->address;
1275 stat->size = lf->size;
1276 /* Version 2 fields: */
1277 namelen = strlen(lf->pathname) + 1;
1278 if (namelen > MAXPATHLEN)
1279 namelen = MAXPATHLEN;
1280 bcopy(lf->pathname, &stat->pathname[0], namelen);
1281 sx_xunlock(&kld_sx);
1282
1283 td->td_retval[0] = 0;
1284 return (0);
1285 }
1286
1287 int
1288 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1289 {
1290 linker_file_t lf;
1291 module_t mp;
1292 int error = 0;
1293
1294 #ifdef MAC
1295 error = mac_kld_check_stat(td->td_ucred);
1296 if (error)
1297 return (error);
1298 #endif
1299
1300 sx_xlock(&kld_sx);
1301 lf = linker_find_file_by_id(uap->fileid);
1302 if (lf) {
1303 MOD_SLOCK;
1304 mp = TAILQ_FIRST(&lf->modules);
1305 if (mp != NULL)
1306 td->td_retval[0] = module_getid(mp);
1307 else
1308 td->td_retval[0] = 0;
1309 MOD_SUNLOCK;
1310 } else
1311 error = ENOENT;
1312 sx_xunlock(&kld_sx);
1313 return (error);
1314 }
1315
1316 int
1317 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1318 {
1319 char *symstr = NULL;
1320 c_linker_sym_t sym;
1321 linker_symval_t symval;
1322 linker_file_t lf;
1323 struct kld_sym_lookup lookup;
1324 int error = 0;
1325
1326 #ifdef MAC
1327 error = mac_kld_check_stat(td->td_ucred);
1328 if (error)
1329 return (error);
1330 #endif
1331
1332 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1333 return (error);
1334 if (lookup.version != sizeof(lookup) ||
1335 uap->cmd != KLDSYM_LOOKUP)
1336 return (EINVAL);
1337 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1338 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1339 goto out;
1340 sx_xlock(&kld_sx);
1341 if (uap->fileid != 0) {
1342 lf = linker_find_file_by_id(uap->fileid);
1343 if (lf == NULL)
1344 error = ENOENT;
1345 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1346 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1347 lookup.symvalue = (uintptr_t) symval.value;
1348 lookup.symsize = symval.size;
1349 error = copyout(&lookup, uap->data, sizeof(lookup));
1350 } else
1351 error = ENOENT;
1352 } else {
1353 TAILQ_FOREACH(lf, &linker_files, link) {
1354 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1355 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1356 lookup.symvalue = (uintptr_t)symval.value;
1357 lookup.symsize = symval.size;
1358 error = copyout(&lookup, uap->data,
1359 sizeof(lookup));
1360 break;
1361 }
1362 }
1363 if (lf == NULL)
1364 error = ENOENT;
1365 }
1366 sx_xunlock(&kld_sx);
1367 out:
1368 free(symstr, M_TEMP);
1369 return (error);
1370 }
1371
1372 /*
1373 * Preloaded module support
1374 */
1375
1376 static modlist_t
1377 modlist_lookup(const char *name, int ver)
1378 {
1379 modlist_t mod;
1380
1381 TAILQ_FOREACH(mod, &found_modules, link) {
1382 if (strcmp(mod->name, name) == 0 &&
1383 (ver == 0 || mod->version == ver))
1384 return (mod);
1385 }
1386 return (NULL);
1387 }
1388
1389 static modlist_t
1390 modlist_lookup2(const char *name, struct mod_depend *verinfo)
1391 {
1392 modlist_t mod, bestmod;
1393 int ver;
1394
1395 if (verinfo == NULL)
1396 return (modlist_lookup(name, 0));
1397 bestmod = NULL;
1398 TAILQ_FOREACH(mod, &found_modules, link) {
1399 if (strcmp(mod->name, name) != 0)
1400 continue;
1401 ver = mod->version;
1402 if (ver == verinfo->md_ver_preferred)
1403 return (mod);
1404 if (ver >= verinfo->md_ver_minimum &&
1405 ver <= verinfo->md_ver_maximum &&
1406 (bestmod == NULL || ver > bestmod->version))
1407 bestmod = mod;
1408 }
1409 return (bestmod);
1410 }
1411
1412 static modlist_t
1413 modlist_newmodule(const char *modname, int version, linker_file_t container)
1414 {
1415 modlist_t mod;
1416
1417 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1418 if (mod == NULL)
1419 panic("no memory for module list");
1420 mod->container = container;
1421 mod->name = modname;
1422 mod->version = version;
1423 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1424 return (mod);
1425 }
1426
1427 static void
1428 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1429 struct mod_metadata **stop, int preload)
1430 {
1431 struct mod_metadata *mp, **mdp;
1432 const char *modname;
1433 int ver;
1434
1435 for (mdp = start; mdp < stop; mdp++) {
1436 mp = *mdp;
1437 if (mp->md_type != MDT_VERSION)
1438 continue;
1439 modname = mp->md_cval;
1440 ver = ((struct mod_version *)mp->md_data)->mv_version;
1441 if (modlist_lookup(modname, ver) != NULL) {
1442 printf("module %s already present!\n", modname);
1443 /* XXX what can we do? this is a build error. :-( */
1444 continue;
1445 }
1446 modlist_newmodule(modname, ver, lf);
1447 }
1448 }
1449
1450 static void
1451 linker_preload(void *arg)
1452 {
1453 caddr_t modptr;
1454 const char *modname, *nmodname;
1455 char *modtype;
1456 linker_file_t lf, nlf;
1457 linker_class_t lc;
1458 int error;
1459 linker_file_list_t loaded_files;
1460 linker_file_list_t depended_files;
1461 struct mod_metadata *mp, *nmp;
1462 struct mod_metadata **start, **stop, **mdp, **nmdp;
1463 struct mod_depend *verinfo;
1464 int nver;
1465 int resolves;
1466 modlist_t mod;
1467 struct sysinit **si_start, **si_stop;
1468
1469 TAILQ_INIT(&loaded_files);
1470 TAILQ_INIT(&depended_files);
1471 TAILQ_INIT(&found_modules);
1472 error = 0;
1473
1474 modptr = NULL;
1475 sx_xlock(&kld_sx);
1476 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1477 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1478 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1479 if (modname == NULL) {
1480 printf("Preloaded module at %p does not have a"
1481 " name!\n", modptr);
1482 continue;
1483 }
1484 if (modtype == NULL) {
1485 printf("Preloaded module at %p does not have a type!\n",
1486 modptr);
1487 continue;
1488 }
1489 if (bootverbose)
1490 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1491 modptr);
1492 lf = NULL;
1493 TAILQ_FOREACH(lc, &classes, link) {
1494 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1495 if (!error)
1496 break;
1497 lf = NULL;
1498 }
1499 if (lf)
1500 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1501 }
1502
1503 /*
1504 * First get a list of stuff in the kernel.
1505 */
1506 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1507 &stop, NULL) == 0)
1508 linker_addmodules(linker_kernel_file, start, stop, 1);
1509
1510 /*
1511 * This is a once-off kinky bubble sort to resolve relocation
1512 * dependency requirements.
1513 */
1514 restart:
1515 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1516 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1517 &stop, NULL);
1518 /*
1519 * First, look to see if we would successfully link with this
1520 * stuff.
1521 */
1522 resolves = 1; /* unless we know otherwise */
1523 if (!error) {
1524 for (mdp = start; mdp < stop; mdp++) {
1525 mp = *mdp;
1526 if (mp->md_type != MDT_DEPEND)
1527 continue;
1528 modname = mp->md_cval;
1529 verinfo = mp->md_data;
1530 for (nmdp = start; nmdp < stop; nmdp++) {
1531 nmp = *nmdp;
1532 if (nmp->md_type != MDT_VERSION)
1533 continue;
1534 nmodname = nmp->md_cval;
1535 if (strcmp(modname, nmodname) == 0)
1536 break;
1537 }
1538 if (nmdp < stop) /* it's a self reference */
1539 continue;
1540
1541 /*
1542 * ok, the module isn't here yet, we
1543 * are not finished
1544 */
1545 if (modlist_lookup2(modname, verinfo) == NULL)
1546 resolves = 0;
1547 }
1548 }
1549 /*
1550 * OK, if we found our modules, we can link. So, "provide"
1551 * the modules inside and add it to the end of the link order
1552 * list.
1553 */
1554 if (resolves) {
1555 if (!error) {
1556 for (mdp = start; mdp < stop; mdp++) {
1557 mp = *mdp;
1558 if (mp->md_type != MDT_VERSION)
1559 continue;
1560 modname = mp->md_cval;
1561 nver = ((struct mod_version *)
1562 mp->md_data)->mv_version;
1563 if (modlist_lookup(modname,
1564 nver) != NULL) {
1565 printf("module %s already"
1566 " present!\n", modname);
1567 TAILQ_REMOVE(&loaded_files,
1568 lf, loaded);
1569 linker_file_unload(lf,
1570 LINKER_UNLOAD_FORCE);
1571 /* we changed tailq next ptr */
1572 goto restart;
1573 }
1574 modlist_newmodule(modname, nver, lf);
1575 }
1576 }
1577 TAILQ_REMOVE(&loaded_files, lf, loaded);
1578 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1579 /*
1580 * Since we provided modules, we need to restart the
1581 * sort so that the previous files that depend on us
1582 * have a chance. Also, we've busted the tailq next
1583 * pointer with the REMOVE.
1584 */
1585 goto restart;
1586 }
1587 }
1588
1589 /*
1590 * At this point, we check to see what could not be resolved..
1591 */
1592 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1593 TAILQ_REMOVE(&loaded_files, lf, loaded);
1594 printf("KLD file %s is missing dependencies\n", lf->filename);
1595 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1596 }
1597
1598 /*
1599 * We made it. Finish off the linking in the order we determined.
1600 */
1601 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1602 if (linker_kernel_file) {
1603 linker_kernel_file->refs++;
1604 error = linker_file_add_dependency(lf,
1605 linker_kernel_file);
1606 if (error)
1607 panic("cannot add dependency");
1608 }
1609 lf->userrefs++; /* so we can (try to) kldunload it */
1610 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1611 &stop, NULL);
1612 if (!error) {
1613 for (mdp = start; mdp < stop; mdp++) {
1614 mp = *mdp;
1615 if (mp->md_type != MDT_DEPEND)
1616 continue;
1617 modname = mp->md_cval;
1618 verinfo = mp->md_data;
1619 mod = modlist_lookup2(modname, verinfo);
1620 if (mod == NULL) {
1621 printf("KLD file %s - cannot find "
1622 "dependency \"%s\"\n",
1623 lf->filename, modname);
1624 goto fail;
1625 }
1626 /* Don't count self-dependencies */
1627 if (lf == mod->container)
1628 continue;
1629 mod->container->refs++;
1630 error = linker_file_add_dependency(lf,
1631 mod->container);
1632 if (error)
1633 panic("cannot add dependency");
1634 }
1635 }
1636 /*
1637 * Now do relocation etc using the symbol search paths
1638 * established by the dependencies
1639 */
1640 error = LINKER_LINK_PRELOAD_FINISH(lf);
1641 if (error) {
1642 printf("KLD file %s - could not finalize loading\n",
1643 lf->filename);
1644 goto fail;
1645 }
1646 linker_file_register_modules(lf);
1647 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1648 &si_stop, NULL) == 0)
1649 sysinit_add(si_start, si_stop);
1650 linker_file_register_sysctls(lf, true);
1651 lf->flags |= LINKER_FILE_LINKED;
1652 continue;
1653 fail:
1654 TAILQ_REMOVE(&depended_files, lf, loaded);
1655 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1656 }
1657 sx_xunlock(&kld_sx);
1658 /* woohoo! we made it! */
1659 }
1660
1661 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1662
1663 /*
1664 * Search for a not-loaded module by name.
1665 *
1666 * Modules may be found in the following locations:
1667 *
1668 * - preloaded (result is just the module name) - on disk (result is full path
1669 * to module)
1670 *
1671 * If the module name is qualified in any way (contains path, etc.) the we
1672 * simply return a copy of it.
1673 *
1674 * The search path can be manipulated via sysctl. Note that we use the ';'
1675 * character as a separator to be consistent with the bootloader.
1676 */
1677
1678 static char linker_hintfile[] = "linker.hints";
1679 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1680
1681 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
1682 sizeof(linker_path), "module load search path");
1683
1684 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1685
1686 static char *linker_ext_list[] = {
1687 "",
1688 ".ko",
1689 NULL
1690 };
1691
1692 /*
1693 * Check if file actually exists either with or without extension listed in
1694 * the linker_ext_list. (probably should be generic for the rest of the
1695 * kernel)
1696 */
1697 static char *
1698 linker_lookup_file(const char *path, int pathlen, const char *name,
1699 int namelen, struct vattr *vap)
1700 {
1701 struct nameidata nd;
1702 struct thread *td = curthread; /* XXX */
1703 char *result, **cpp, *sep;
1704 int error, len, extlen, reclen, flags;
1705 enum vtype type;
1706
1707 extlen = 0;
1708 for (cpp = linker_ext_list; *cpp; cpp++) {
1709 len = strlen(*cpp);
1710 if (len > extlen)
1711 extlen = len;
1712 }
1713 extlen++; /* trailing '\0' */
1714 sep = (path[pathlen - 1] != '/') ? "/" : "";
1715
1716 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1717 result = malloc(reclen, M_LINKER, M_WAITOK);
1718 for (cpp = linker_ext_list; *cpp; cpp++) {
1719 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1720 namelen, name, *cpp);
1721 /*
1722 * Attempt to open the file, and return the path if
1723 * we succeed and it's a regular file.
1724 */
1725 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1726 flags = FREAD;
1727 error = vn_open(&nd, &flags, 0, NULL);
1728 if (error == 0) {
1729 NDFREE(&nd, NDF_ONLY_PNBUF);
1730 type = nd.ni_vp->v_type;
1731 if (vap)
1732 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1733 VOP_UNLOCK(nd.ni_vp, 0);
1734 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1735 if (type == VREG)
1736 return (result);
1737 }
1738 }
1739 free(result, M_LINKER);
1740 return (NULL);
1741 }
1742
1743 #define INT_ALIGN(base, ptr) ptr = \
1744 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
1745
1746 /*
1747 * Lookup KLD which contains requested module in the "linker.hints" file. If
1748 * version specification is available, then try to find the best KLD.
1749 * Otherwise just find the latest one.
1750 */
1751 static char *
1752 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1753 int modnamelen, struct mod_depend *verinfo)
1754 {
1755 struct thread *td = curthread; /* XXX */
1756 struct ucred *cred = td ? td->td_ucred : NULL;
1757 struct nameidata nd;
1758 struct vattr vattr, mattr;
1759 u_char *hints = NULL;
1760 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1761 int error, ival, bestver, *intp, found, flags, clen, blen;
1762 ssize_t reclen;
1763
1764 result = NULL;
1765 bestver = found = 0;
1766
1767 sep = (path[pathlen - 1] != '/') ? "/" : "";
1768 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1769 strlen(sep) + 1;
1770 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1771 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1772 linker_hintfile);
1773
1774 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1775 flags = FREAD;
1776 error = vn_open(&nd, &flags, 0, NULL);
1777 if (error)
1778 goto bad;
1779 NDFREE(&nd, NDF_ONLY_PNBUF);
1780 if (nd.ni_vp->v_type != VREG)
1781 goto bad;
1782 best = cp = NULL;
1783 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1784 if (error)
1785 goto bad;
1786 /*
1787 * XXX: we need to limit this number to some reasonable value
1788 */
1789 if (vattr.va_size > 100 * 1024) {
1790 printf("hints file too large %ld\n", (long)vattr.va_size);
1791 goto bad;
1792 }
1793 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1794 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1795 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1796 if (error)
1797 goto bad;
1798 VOP_UNLOCK(nd.ni_vp, 0);
1799 vn_close(nd.ni_vp, FREAD, cred, td);
1800 nd.ni_vp = NULL;
1801 if (reclen != 0) {
1802 printf("can't read %zd\n", reclen);
1803 goto bad;
1804 }
1805 intp = (int *)hints;
1806 ival = *intp++;
1807 if (ival != LINKER_HINTS_VERSION) {
1808 printf("hints file version mismatch %d\n", ival);
1809 goto bad;
1810 }
1811 bufend = hints + vattr.va_size;
1812 recptr = (u_char *)intp;
1813 clen = blen = 0;
1814 while (recptr < bufend && !found) {
1815 intp = (int *)recptr;
1816 reclen = *intp++;
1817 ival = *intp++;
1818 cp = (char *)intp;
1819 switch (ival) {
1820 case MDT_VERSION:
1821 clen = *cp++;
1822 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1823 break;
1824 cp += clen;
1825 INT_ALIGN(hints, cp);
1826 ival = *(int *)cp;
1827 cp += sizeof(int);
1828 clen = *cp++;
1829 if (verinfo == NULL ||
1830 ival == verinfo->md_ver_preferred) {
1831 found = 1;
1832 break;
1833 }
1834 if (ival >= verinfo->md_ver_minimum &&
1835 ival <= verinfo->md_ver_maximum &&
1836 ival > bestver) {
1837 bestver = ival;
1838 best = cp;
1839 blen = clen;
1840 }
1841 break;
1842 default:
1843 break;
1844 }
1845 recptr += reclen + sizeof(int);
1846 }
1847 /*
1848 * Finally check if KLD is in the place
1849 */
1850 if (found)
1851 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1852 else if (best)
1853 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1854
1855 /*
1856 * KLD is newer than hints file. What we should do now?
1857 */
1858 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1859 printf("warning: KLD '%s' is newer than the linker.hints"
1860 " file\n", result);
1861 bad:
1862 free(pathbuf, M_LINKER);
1863 if (hints)
1864 free(hints, M_TEMP);
1865 if (nd.ni_vp != NULL) {
1866 VOP_UNLOCK(nd.ni_vp, 0);
1867 vn_close(nd.ni_vp, FREAD, cred, td);
1868 }
1869 /*
1870 * If nothing found or hints is absent - fallback to the old
1871 * way by using "kldname[.ko]" as module name.
1872 */
1873 if (!found && !bestver && result == NULL)
1874 result = linker_lookup_file(path, pathlen, modname,
1875 modnamelen, NULL);
1876 return (result);
1877 }
1878
1879 /*
1880 * Lookup KLD which contains requested module in the all directories.
1881 */
1882 static char *
1883 linker_search_module(const char *modname, int modnamelen,
1884 struct mod_depend *verinfo)
1885 {
1886 char *cp, *ep, *result;
1887
1888 /*
1889 * traverse the linker path
1890 */
1891 for (cp = linker_path; *cp; cp = ep + 1) {
1892 /* find the end of this component */
1893 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1894 result = linker_hints_lookup(cp, ep - cp, modname,
1895 modnamelen, verinfo);
1896 if (result != NULL)
1897 return (result);
1898 if (*ep == 0)
1899 break;
1900 }
1901 return (NULL);
1902 }
1903
1904 /*
1905 * Search for module in all directories listed in the linker_path.
1906 */
1907 static char *
1908 linker_search_kld(const char *name)
1909 {
1910 char *cp, *ep, *result;
1911 int len;
1912
1913 /* qualified at all? */
1914 if (strchr(name, '/'))
1915 return (strdup(name, M_LINKER));
1916
1917 /* traverse the linker path */
1918 len = strlen(name);
1919 for (ep = linker_path; *ep; ep++) {
1920 cp = ep;
1921 /* find the end of this component */
1922 for (; *ep != 0 && *ep != ';'; ep++);
1923 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
1924 if (result != NULL)
1925 return (result);
1926 }
1927 return (NULL);
1928 }
1929
1930 static const char *
1931 linker_basename(const char *path)
1932 {
1933 const char *filename;
1934
1935 filename = strrchr(path, '/');
1936 if (filename == NULL)
1937 return path;
1938 if (filename[1])
1939 filename++;
1940 return (filename);
1941 }
1942
1943 #ifdef HWPMC_HOOKS
1944 /*
1945 * Inform hwpmc about the set of kernel modules currently loaded.
1946 */
1947 void *
1948 linker_hwpmc_list_objects(void)
1949 {
1950 linker_file_t lf;
1951 struct pmckern_map_in *kobase;
1952 int i, nmappings;
1953
1954 nmappings = 0;
1955 sx_slock(&kld_sx);
1956 TAILQ_FOREACH(lf, &linker_files, link)
1957 nmappings++;
1958
1959 /* Allocate nmappings + 1 entries. */
1960 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
1961 M_LINKER, M_WAITOK | M_ZERO);
1962 i = 0;
1963 TAILQ_FOREACH(lf, &linker_files, link) {
1964
1965 /* Save the info for this linker file. */
1966 kobase[i].pm_file = lf->filename;
1967 kobase[i].pm_address = (uintptr_t)lf->address;
1968 i++;
1969 }
1970 sx_sunlock(&kld_sx);
1971
1972 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
1973
1974 /* The last entry of the malloced area comprises of all zeros. */
1975 KASSERT(kobase[i].pm_file == NULL,
1976 ("linker_hwpmc_list_objects: last object not NULL"));
1977
1978 return ((void *)kobase);
1979 }
1980 #endif
1981
1982 /*
1983 * Find a file which contains given module and load it, if "parent" is not
1984 * NULL, register a reference to it.
1985 */
1986 static int
1987 linker_load_module(const char *kldname, const char *modname,
1988 struct linker_file *parent, struct mod_depend *verinfo,
1989 struct linker_file **lfpp)
1990 {
1991 linker_file_t lfdep;
1992 const char *filename;
1993 char *pathname;
1994 int error;
1995
1996 sx_assert(&kld_sx, SA_XLOCKED);
1997 if (modname == NULL) {
1998 /*
1999 * We have to load KLD
2000 */
2001 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2002 " is not NULL"));
2003 /* check if root file system is not mounted */
2004 if (rootvnode == NULL || curproc->p_fd->fd_rdir == NULL)
2005 return (ENXIO);
2006 pathname = linker_search_kld(kldname);
2007 } else {
2008 if (modlist_lookup2(modname, verinfo) != NULL)
2009 return (EEXIST);
2010 /* check if root file system is not mounted */
2011 if (rootvnode == NULL || curproc->p_fd->fd_rdir == NULL)
2012 return (ENXIO);
2013 if (kldname != NULL)
2014 pathname = strdup(kldname, M_LINKER);
2015 else
2016 /*
2017 * Need to find a KLD with required module
2018 */
2019 pathname = linker_search_module(modname,
2020 strlen(modname), verinfo);
2021 }
2022 if (pathname == NULL)
2023 return (ENOENT);
2024
2025 /*
2026 * Can't load more than one file with the same basename XXX:
2027 * Actually it should be possible to have multiple KLDs with
2028 * the same basename but different path because they can
2029 * provide different versions of the same modules.
2030 */
2031 filename = linker_basename(pathname);
2032 if (linker_find_file_by_name(filename))
2033 error = EEXIST;
2034 else do {
2035 error = linker_load_file(pathname, &lfdep);
2036 if (error)
2037 break;
2038 if (modname && verinfo &&
2039 modlist_lookup2(modname, verinfo) == NULL) {
2040 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2041 error = ENOENT;
2042 break;
2043 }
2044 if (parent) {
2045 error = linker_file_add_dependency(parent, lfdep);
2046 if (error)
2047 break;
2048 }
2049 if (lfpp)
2050 *lfpp = lfdep;
2051 } while (0);
2052 free(pathname, M_LINKER);
2053 return (error);
2054 }
2055
2056 /*
2057 * This routine is responsible for finding dependencies of userland initiated
2058 * kldload(2)'s of files.
2059 */
2060 int
2061 linker_load_dependencies(linker_file_t lf)
2062 {
2063 linker_file_t lfdep;
2064 struct mod_metadata **start, **stop, **mdp, **nmdp;
2065 struct mod_metadata *mp, *nmp;
2066 struct mod_depend *verinfo;
2067 modlist_t mod;
2068 const char *modname, *nmodname;
2069 int ver, error = 0, count;
2070
2071 /*
2072 * All files are dependent on /kernel.
2073 */
2074 sx_assert(&kld_sx, SA_XLOCKED);
2075 if (linker_kernel_file) {
2076 linker_kernel_file->refs++;
2077 error = linker_file_add_dependency(lf, linker_kernel_file);
2078 if (error)
2079 return (error);
2080 }
2081 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2082 &count) != 0)
2083 return (0);
2084 for (mdp = start; mdp < stop; mdp++) {
2085 mp = *mdp;
2086 if (mp->md_type != MDT_VERSION)
2087 continue;
2088 modname = mp->md_cval;
2089 ver = ((struct mod_version *)mp->md_data)->mv_version;
2090 mod = modlist_lookup(modname, ver);
2091 if (mod != NULL) {
2092 printf("interface %s.%d already present in the KLD"
2093 " '%s'!\n", modname, ver,
2094 mod->container->filename);
2095 return (EEXIST);
2096 }
2097 }
2098
2099 for (mdp = start; mdp < stop; mdp++) {
2100 mp = *mdp;
2101 if (mp->md_type != MDT_DEPEND)
2102 continue;
2103 modname = mp->md_cval;
2104 verinfo = mp->md_data;
2105 nmodname = NULL;
2106 for (nmdp = start; nmdp < stop; nmdp++) {
2107 nmp = *nmdp;
2108 if (nmp->md_type != MDT_VERSION)
2109 continue;
2110 nmodname = nmp->md_cval;
2111 if (strcmp(modname, nmodname) == 0)
2112 break;
2113 }
2114 if (nmdp < stop)/* early exit, it's a self reference */
2115 continue;
2116 mod = modlist_lookup2(modname, verinfo);
2117 if (mod) { /* woohoo, it's loaded already */
2118 lfdep = mod->container;
2119 lfdep->refs++;
2120 error = linker_file_add_dependency(lf, lfdep);
2121 if (error)
2122 break;
2123 continue;
2124 }
2125 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2126 if (error) {
2127 printf("KLD %s: depends on %s - not available or"
2128 " version mismatch\n", lf->filename, modname);
2129 break;
2130 }
2131 }
2132
2133 if (error)
2134 return (error);
2135 linker_addmodules(lf, start, stop, 0);
2136 return (error);
2137 }
2138
2139 static int
2140 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2141 {
2142 struct sysctl_req *req;
2143
2144 req = opaque;
2145 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2146 }
2147
2148 /*
2149 * Export a nul-separated, double-nul-terminated list of all function names
2150 * in the kernel.
2151 */
2152 static int
2153 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2154 {
2155 linker_file_t lf;
2156 int error;
2157
2158 #ifdef MAC
2159 error = mac_kld_check_stat(req->td->td_ucred);
2160 if (error)
2161 return (error);
2162 #endif
2163 error = sysctl_wire_old_buffer(req, 0);
2164 if (error != 0)
2165 return (error);
2166 sx_xlock(&kld_sx);
2167 TAILQ_FOREACH(lf, &linker_files, link) {
2168 error = LINKER_EACH_FUNCTION_NAME(lf,
2169 sysctl_kern_function_list_iterate, req);
2170 if (error) {
2171 sx_xunlock(&kld_sx);
2172 return (error);
2173 }
2174 }
2175 sx_xunlock(&kld_sx);
2176 return (SYSCTL_OUT(req, "", 1));
2177 }
2178
2179 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2180 NULL, 0, sysctl_kern_function_list, "", "kernel function list");
Cache object: 17f0df1746134a98436e58a2ffd77f15
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