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