1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/sys/boot/common/module.c,v 1.27 2007/10/04 18:29:52 obrien Exp $");
29
30 /*
31 * file/module function dispatcher, support, etc.
32 */
33
34 #include <stand.h>
35 #include <string.h>
36 #include <sys/param.h>
37 #include <sys/linker.h>
38 #include <sys/module.h>
39 #include <sys/queue.h>
40
41 #include "bootstrap.h"
42
43 #define MDIR_REMOVED 0x0001
44 #define MDIR_NOHINTS 0x0002
45
46 struct moduledir {
47 char *d_path; /* path of modules directory */
48 u_char *d_hints; /* content of linker.hints file */
49 int d_hintsz; /* size of hints data */
50 int d_flags;
51 STAILQ_ENTRY(moduledir) d_link;
52 };
53
54 static int file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
55 static int file_loadraw(char *type, char *name);
56 static int file_load_dependencies(struct preloaded_file *base_mod);
57 static char * file_search(const char *name, char **extlist);
58 static struct kernel_module * file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
59 static int file_havepath(const char *name);
60 static char *mod_searchmodule(char *name, struct mod_depend *verinfo);
61 static void file_insert_tail(struct preloaded_file *mp);
62 struct file_metadata* metadata_next(struct file_metadata *base_mp, int type);
63 static void moduledir_readhints(struct moduledir *mdp);
64 static void moduledir_rebuild(void);
65
66 /* load address should be tweaked by first module loaded (kernel) */
67 static vm_offset_t loadaddr = 0;
68
69 static const char *default_searchpath ="/boot/kernel;/boot/modules";
70
71 static STAILQ_HEAD(, moduledir) moduledir_list = STAILQ_HEAD_INITIALIZER(moduledir_list);
72
73 struct preloaded_file *preloaded_files = NULL;
74
75 static char *kld_ext_list[] = {
76 ".ko",
77 "",
78 ".debug",
79 NULL
80 };
81
82
83 /*
84 * load an object, either a disk file or code module.
85 *
86 * To load a file, the syntax is:
87 *
88 * load -t <type> <path>
89 *
90 * code modules are loaded as:
91 *
92 * load <path> <options>
93 */
94
95 COMMAND_SET(load, "load", "load a kernel or module", command_load);
96
97 static int
98 command_load(int argc, char *argv[])
99 {
100 char *typestr;
101 int dofile, dokld, ch, error;
102
103 dokld = dofile = 0;
104 optind = 1;
105 optreset = 1;
106 typestr = NULL;
107 if (argc == 1) {
108 command_errmsg = "no filename specified";
109 return(CMD_ERROR);
110 }
111 while ((ch = getopt(argc, argv, "kt:")) != -1) {
112 switch(ch) {
113 case 'k':
114 dokld = 1;
115 break;
116 case 't':
117 typestr = optarg;
118 dofile = 1;
119 break;
120 case '?':
121 default:
122 /* getopt has already reported an error */
123 return(CMD_OK);
124 }
125 }
126 argv += (optind - 1);
127 argc -= (optind - 1);
128
129 /*
130 * Request to load a raw file?
131 */
132 if (dofile) {
133 if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
134 command_errmsg = "invalid load type";
135 return(CMD_ERROR);
136 }
137 return(file_loadraw(typestr, argv[1]));
138 }
139 /*
140 * Do we have explicit KLD load ?
141 */
142 if (dokld || file_havepath(argv[1])) {
143 error = mod_loadkld(argv[1], argc - 2, argv + 2);
144 if (error == EEXIST)
145 sprintf(command_errbuf, "warning: KLD '%s' already loaded", argv[1]);
146 return (error == 0 ? CMD_OK : CMD_ERROR);
147 }
148 /*
149 * Looks like a request for a module.
150 */
151 error = mod_load(argv[1], NULL, argc - 2, argv + 2);
152 if (error == EEXIST)
153 sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]);
154 return (error == 0 ? CMD_OK : CMD_ERROR);
155 }
156
157 COMMAND_SET(unload, "unload", "unload all modules", command_unload);
158
159 static int
160 command_unload(int argc, char *argv[])
161 {
162 struct preloaded_file *fp;
163
164 while (preloaded_files != NULL) {
165 fp = preloaded_files;
166 preloaded_files = preloaded_files->f_next;
167 file_discard(fp);
168 }
169 loadaddr = 0;
170 unsetenv("kernelname");
171 return(CMD_OK);
172 }
173
174 COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
175
176 static int
177 command_lsmod(int argc, char *argv[])
178 {
179 struct preloaded_file *fp;
180 struct kernel_module *mp;
181 struct file_metadata *md;
182 char lbuf[80];
183 int ch, verbose;
184
185 verbose = 0;
186 optind = 1;
187 optreset = 1;
188 while ((ch = getopt(argc, argv, "v")) != -1) {
189 switch(ch) {
190 case 'v':
191 verbose = 1;
192 break;
193 case '?':
194 default:
195 /* getopt has already reported an error */
196 return(CMD_OK);
197 }
198 }
199
200 pager_open();
201 for (fp = preloaded_files; fp; fp = fp->f_next) {
202 sprintf(lbuf, " %p: %s (%s, 0x%lx)\n",
203 (void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size);
204 pager_output(lbuf);
205 if (fp->f_args != NULL) {
206 pager_output(" args: ");
207 pager_output(fp->f_args);
208 pager_output("\n");
209 }
210 if (fp->f_modules) {
211 pager_output(" modules: ");
212 for (mp = fp->f_modules; mp; mp = mp->m_next) {
213 sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version);
214 pager_output(lbuf);
215 }
216 pager_output("\n");
217 }
218 if (verbose) {
219 /* XXX could add some formatting smarts here to display some better */
220 for (md = fp->f_metadata; md != NULL; md = md->md_next) {
221 sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size);
222 pager_output(lbuf);
223 }
224 }
225 }
226 pager_close();
227 return(CMD_OK);
228 }
229
230 /*
231 * File level interface, functions file_*
232 */
233 int
234 file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
235 {
236 struct preloaded_file *fp;
237 int error;
238 int i;
239
240 error = EFTYPE;
241 for (i = 0, fp = NULL; file_formats[i] && fp == NULL; i++) {
242 error = (file_formats[i]->l_load)(filename, loadaddr, &fp);
243 if (error == 0) {
244 fp->f_loader = i; /* remember the loader */
245 *result = fp;
246 break;
247 }
248 if (error == EFTYPE)
249 continue; /* Unknown to this handler? */
250 if (error) {
251 sprintf(command_errbuf, "can't load file '%s': %s",
252 filename, strerror(error));
253 break;
254 }
255 }
256 return (error);
257 }
258
259 static int
260 file_load_dependencies(struct preloaded_file *base_file) {
261 struct file_metadata *md;
262 struct preloaded_file *fp;
263 struct mod_depend *verinfo;
264 struct kernel_module *mp;
265 char *dmodname;
266 int error;
267
268 md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
269 if (md == NULL)
270 return (0);
271 error = 0;
272 do {
273 verinfo = (struct mod_depend*)md->md_data;
274 dmodname = (char *)(verinfo + 1);
275 if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
276 printf("loading required module '%s'\n", dmodname);
277 error = mod_load(dmodname, verinfo, 0, NULL);
278 if (error)
279 break;
280 /*
281 * If module loaded via kld name which isn't listed
282 * in the linker.hints file, we should check if it have
283 * required version.
284 */
285 mp = file_findmodule(NULL, dmodname, verinfo);
286 if (mp == NULL) {
287 sprintf(command_errbuf, "module '%s' exists but with wrong version",
288 dmodname);
289 error = ENOENT;
290 break;
291 }
292 }
293 md = metadata_next(md, MODINFOMD_DEPLIST);
294 } while (md);
295 if (!error)
296 return (0);
297 /* Load failed; discard everything */
298 while (base_file != NULL) {
299 fp = base_file;
300 base_file = base_file->f_next;
301 file_discard(fp);
302 }
303 return (error);
304 }
305 /*
306 * We've been asked to load (name) as (type), so just suck it in,
307 * no arguments or anything.
308 */
309 int
310 file_loadraw(char *type, char *name)
311 {
312 struct preloaded_file *fp;
313 char *cp;
314 int fd, got;
315 vm_offset_t laddr;
316
317 /* We can't load first */
318 if ((file_findfile(NULL, NULL)) == NULL) {
319 command_errmsg = "can't load file before kernel";
320 return(CMD_ERROR);
321 }
322
323 /* locate the file on the load path */
324 cp = file_search(name, NULL);
325 if (cp == NULL) {
326 sprintf(command_errbuf, "can't find '%s'", name);
327 return(CMD_ERROR);
328 }
329 name = cp;
330
331 if ((fd = open(name, O_RDONLY)) < 0) {
332 sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno));
333 free(name);
334 return(CMD_ERROR);
335 }
336
337 laddr = loadaddr;
338 for (;;) {
339 /* read in 4k chunks; size is not really important */
340 got = archsw.arch_readin(fd, laddr, 4096);
341 if (got == 0) /* end of file */
342 break;
343 if (got < 0) { /* error */
344 sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno));
345 free(name);
346 close(fd);
347 return(CMD_ERROR);
348 }
349 laddr += got;
350 }
351
352 /* Looks OK so far; create & populate control structure */
353 fp = file_alloc();
354 fp->f_name = name;
355 fp->f_type = strdup(type);
356 fp->f_args = NULL;
357 fp->f_metadata = NULL;
358 fp->f_loader = -1;
359 fp->f_addr = loadaddr;
360 fp->f_size = laddr - loadaddr;
361
362 /* recognise space consumption */
363 loadaddr = laddr;
364
365 /* Add to the list of loaded files */
366 file_insert_tail(fp);
367 close(fd);
368 return(CMD_OK);
369 }
370
371 /*
372 * Load the module (name), pass it (argc),(argv), add container file
373 * to the list of loaded files.
374 * If module is already loaded just assign new argc/argv.
375 */
376 int
377 mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
378 {
379 struct kernel_module *mp;
380 int err;
381 char *filename;
382
383 if (file_havepath(modname)) {
384 printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
385 return (mod_loadkld(modname, argc, argv));
386 }
387 /* see if module is already loaded */
388 mp = file_findmodule(NULL, modname, verinfo);
389 if (mp) {
390 #ifdef moduleargs
391 if (mp->m_args)
392 free(mp->m_args);
393 mp->m_args = unargv(argc, argv);
394 #endif
395 sprintf(command_errbuf, "warning: module '%s' already loaded", mp->m_name);
396 return (0);
397 }
398 /* locate file with the module on the search path */
399 filename = mod_searchmodule(modname, verinfo);
400 if (filename == NULL) {
401 sprintf(command_errbuf, "can't find '%s'", modname);
402 return (ENOENT);
403 }
404 err = mod_loadkld(filename, argc, argv);
405 return (err);
406 }
407
408 /*
409 * Load specified KLD. If path is omitted, then try to locate it via
410 * search path.
411 */
412 int
413 mod_loadkld(const char *kldname, int argc, char *argv[])
414 {
415 struct preloaded_file *fp, *last_file;
416 int err;
417 char *filename;
418
419 /*
420 * Get fully qualified KLD name
421 */
422 filename = file_search(kldname, kld_ext_list);
423 if (filename == NULL) {
424 sprintf(command_errbuf, "can't find '%s'", kldname);
425 return (ENOENT);
426 }
427 /*
428 * Check if KLD already loaded
429 */
430 fp = file_findfile(filename, NULL);
431 if (fp) {
432 sprintf(command_errbuf, "warning: KLD '%s' already loaded", filename);
433 free(filename);
434 return (0);
435 }
436 for (last_file = preloaded_files;
437 last_file != NULL && last_file->f_next != NULL;
438 last_file = last_file->f_next)
439 ;
440
441 do {
442 err = file_load(filename, loadaddr, &fp);
443 if (err)
444 break;
445 fp->f_args = unargv(argc, argv);
446 loadaddr = fp->f_addr + fp->f_size;
447 file_insert_tail(fp); /* Add to the list of loaded files */
448 if (file_load_dependencies(fp) != 0) {
449 err = ENOENT;
450 last_file->f_next = NULL;
451 loadaddr = last_file->f_addr + last_file->f_size;
452 fp = NULL;
453 break;
454 }
455 } while(0);
456 if (err == EFTYPE)
457 sprintf(command_errbuf, "don't know how to load module '%s'", filename);
458 if (err && fp)
459 file_discard(fp);
460 free(filename);
461 return (err);
462 }
463
464 /*
465 * Find a file matching (name) and (type).
466 * NULL may be passed as a wildcard to either.
467 */
468 struct preloaded_file *
469 file_findfile(char *name, char *type)
470 {
471 struct preloaded_file *fp;
472
473 for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
474 if (((name == NULL) || !strcmp(name, fp->f_name)) &&
475 ((type == NULL) || !strcmp(type, fp->f_type)))
476 break;
477 }
478 return (fp);
479 }
480
481 /*
482 * Find a module matching (name) inside of given file.
483 * NULL may be passed as a wildcard.
484 */
485 struct kernel_module *
486 file_findmodule(struct preloaded_file *fp, char *modname,
487 struct mod_depend *verinfo)
488 {
489 struct kernel_module *mp, *best;
490 int bestver, mver;
491
492 if (fp == NULL) {
493 for (fp = preloaded_files; fp; fp = fp->f_next) {
494 mp = file_findmodule(fp, modname, verinfo);
495 if (mp)
496 return (mp);
497 }
498 return (NULL);
499 }
500 best = NULL;
501 bestver = 0;
502 for (mp = fp->f_modules; mp; mp = mp->m_next) {
503 if (strcmp(modname, mp->m_name) == 0) {
504 if (verinfo == NULL)
505 return (mp);
506 mver = mp->m_version;
507 if (mver == verinfo->md_ver_preferred)
508 return (mp);
509 if (mver >= verinfo->md_ver_minimum &&
510 mver <= verinfo->md_ver_maximum &&
511 mver > bestver) {
512 best = mp;
513 bestver = mver;
514 }
515 }
516 }
517 return (best);
518 }
519 /*
520 * Make a copy of (size) bytes of data from (p), and associate them as
521 * metadata of (type) to the module (mp).
522 */
523 void
524 file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
525 {
526 struct file_metadata *md;
527
528 md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
529 md->md_size = size;
530 md->md_type = type;
531 bcopy(p, md->md_data, size);
532 md->md_next = fp->f_metadata;
533 fp->f_metadata = md;
534 }
535
536 /*
537 * Find a metadata object of (type) associated with the file (fp)
538 */
539 struct file_metadata *
540 file_findmetadata(struct preloaded_file *fp, int type)
541 {
542 struct file_metadata *md;
543
544 for (md = fp->f_metadata; md != NULL; md = md->md_next)
545 if (md->md_type == type)
546 break;
547 return(md);
548 }
549
550 struct file_metadata *
551 metadata_next(struct file_metadata *md, int type)
552 {
553 if (md == NULL)
554 return (NULL);
555 while((md = md->md_next) != NULL)
556 if (md->md_type == type)
557 break;
558 return (md);
559 }
560
561 static char *emptyextlist[] = { "", NULL };
562
563 /*
564 * Check if the given file is in place and return full path to it.
565 */
566 static char *
567 file_lookup(const char *path, const char *name, int namelen, char **extlist)
568 {
569 struct stat st;
570 char *result, *cp, **cpp;
571 int pathlen, extlen, len;
572
573 pathlen = strlen(path);
574 extlen = 0;
575 if (extlist == NULL)
576 extlist = emptyextlist;
577 for (cpp = extlist; *cpp; cpp++) {
578 len = strlen(*cpp);
579 if (len > extlen)
580 extlen = len;
581 }
582 result = malloc(pathlen + namelen + extlen + 2);
583 if (result == NULL)
584 return (NULL);
585 bcopy(path, result, pathlen);
586 if (pathlen > 0 && result[pathlen - 1] != '/')
587 result[pathlen++] = '/';
588 cp = result + pathlen;
589 bcopy(name, cp, namelen);
590 cp += namelen;
591 for (cpp = extlist; *cpp; cpp++) {
592 strcpy(cp, *cpp);
593 if (stat(result, &st) == 0 && S_ISREG(st.st_mode))
594 return result;
595 }
596 free(result);
597 return NULL;
598 }
599
600 /*
601 * Check if file name have any qualifiers
602 */
603 static int
604 file_havepath(const char *name)
605 {
606 const char *cp;
607
608 archsw.arch_getdev(NULL, name, &cp);
609 return (cp != name || strchr(name, '/') != NULL);
610 }
611
612 /*
613 * Attempt to find the file (name) on the module searchpath.
614 * If (name) is qualified in any way, we simply check it and
615 * return it or NULL. If it is not qualified, then we attempt
616 * to construct a path using entries in the environment variable
617 * module_path.
618 *
619 * The path we return a pointer to need never be freed, as we manage
620 * it internally.
621 */
622 static char *
623 file_search(const char *name, char **extlist)
624 {
625 struct moduledir *mdp;
626 struct stat sb;
627 char *result;
628 int namelen;
629
630 /* Don't look for nothing */
631 if (name == NULL)
632 return(NULL);
633
634 if (*name == 0)
635 return(strdup(name));
636
637 if (file_havepath(name)) {
638 /* Qualified, so just see if it exists */
639 if (stat(name, &sb) == 0)
640 return(strdup(name));
641 return(NULL);
642 }
643 moduledir_rebuild();
644 result = NULL;
645 namelen = strlen(name);
646 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
647 result = file_lookup(mdp->d_path, name, namelen, extlist);
648 if (result)
649 break;
650 }
651 return(result);
652 }
653
654 #define INT_ALIGN(base, ptr) ptr = \
655 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
656
657 static char *
658 mod_search_hints(struct moduledir *mdp, const char *modname,
659 struct mod_depend *verinfo)
660 {
661 u_char *cp, *recptr, *bufend, *best;
662 char *result;
663 int *intp, bestver, blen, clen, found, ival, modnamelen, reclen;
664
665 moduledir_readhints(mdp);
666 modnamelen = strlen(modname);
667 found = 0;
668 result = NULL;
669 bestver = 0;
670 if (mdp->d_hints == NULL)
671 goto bad;
672 recptr = mdp->d_hints;
673 bufend = recptr + mdp->d_hintsz;
674 clen = blen = 0;
675 best = cp = NULL;
676 while (recptr < bufend && !found) {
677 intp = (int*)recptr;
678 reclen = *intp++;
679 ival = *intp++;
680 cp = (char*)intp;
681 switch (ival) {
682 case MDT_VERSION:
683 clen = *cp++;
684 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
685 break;
686 cp += clen;
687 INT_ALIGN(mdp->d_hints, cp);
688 ival = *(int*)cp;
689 cp += sizeof(int);
690 clen = *cp++;
691 if (verinfo == NULL || ival == verinfo->md_ver_preferred) {
692 found = 1;
693 break;
694 }
695 if (ival >= verinfo->md_ver_minimum &&
696 ival <= verinfo->md_ver_maximum &&
697 ival > bestver) {
698 bestver = ival;
699 best = cp;
700 blen = clen;
701 }
702 break;
703 default:
704 break;
705 }
706 recptr += reclen + sizeof(int);
707 }
708 /*
709 * Finally check if KLD is in the place
710 */
711 if (found)
712 result = file_lookup(mdp->d_path, cp, clen, NULL);
713 else if (best)
714 result = file_lookup(mdp->d_path, best, blen, NULL);
715 bad:
716 /*
717 * If nothing found or hints is absent - fallback to the old way
718 * by using "kldname[.ko]" as module name.
719 */
720 if (!found && !bestver && result == NULL)
721 result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
722 return result;
723 }
724
725 /*
726 * Attempt to locate the file containing the module (name)
727 */
728 static char *
729 mod_searchmodule(char *name, struct mod_depend *verinfo)
730 {
731 struct moduledir *mdp;
732 char *result;
733
734 moduledir_rebuild();
735 /*
736 * Now we ready to lookup module in the given directories
737 */
738 result = NULL;
739 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
740 result = mod_search_hints(mdp, name, verinfo);
741 if (result)
742 break;
743 }
744
745 return(result);
746 }
747
748 int
749 file_addmodule(struct preloaded_file *fp, char *modname, int version,
750 struct kernel_module **newmp)
751 {
752 struct kernel_module *mp;
753 struct mod_depend mdepend;
754
755 bzero(&mdepend, sizeof(mdepend));
756 mdepend.md_ver_preferred = version;
757 mp = file_findmodule(fp, modname, &mdepend);
758 if (mp)
759 return (EEXIST);
760 mp = malloc(sizeof(struct kernel_module));
761 if (mp == NULL)
762 return (ENOMEM);
763 bzero(mp, sizeof(struct kernel_module));
764 mp->m_name = strdup(modname);
765 mp->m_version = version;
766 mp->m_fp = fp;
767 mp->m_next = fp->f_modules;
768 fp->f_modules = mp;
769 if (newmp)
770 *newmp = mp;
771 return (0);
772 }
773
774 /*
775 * Throw a file away
776 */
777 void
778 file_discard(struct preloaded_file *fp)
779 {
780 struct file_metadata *md, *md1;
781 struct kernel_module *mp, *mp1;
782 if (fp == NULL)
783 return;
784 md = fp->f_metadata;
785 while (md) {
786 md1 = md;
787 md = md->md_next;
788 free(md1);
789 }
790 mp = fp->f_modules;
791 while (mp) {
792 if (mp->m_name)
793 free(mp->m_name);
794 mp1 = mp;
795 mp = mp->m_next;
796 free(mp1);
797 }
798 if (fp->f_name != NULL)
799 free(fp->f_name);
800 if (fp->f_type != NULL)
801 free(fp->f_type);
802 if (fp->f_args != NULL)
803 free(fp->f_args);
804 free(fp);
805 }
806
807 /*
808 * Allocate a new file; must be used instead of malloc()
809 * to ensure safe initialisation.
810 */
811 struct preloaded_file *
812 file_alloc(void)
813 {
814 struct preloaded_file *fp;
815
816 if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) {
817 bzero(fp, sizeof(struct preloaded_file));
818 }
819 return (fp);
820 }
821
822 /*
823 * Add a module to the chain
824 */
825 static void
826 file_insert_tail(struct preloaded_file *fp)
827 {
828 struct preloaded_file *cm;
829
830 /* Append to list of loaded file */
831 fp->f_next = NULL;
832 if (preloaded_files == NULL) {
833 preloaded_files = fp;
834 } else {
835 for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
836 ;
837 cm->f_next = fp;
838 }
839 }
840
841 static char *
842 moduledir_fullpath(struct moduledir *mdp, const char *fname)
843 {
844 char *cp;
845
846 cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
847 if (cp == NULL)
848 return NULL;
849 strcpy(cp, mdp->d_path);
850 strcat(cp, "/");
851 strcat(cp, fname);
852 return (cp);
853 }
854
855 /*
856 * Read linker.hints file into memory performing some sanity checks.
857 */
858 static void
859 moduledir_readhints(struct moduledir *mdp)
860 {
861 struct stat st;
862 char *path;
863 int fd, size, version;
864
865 if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
866 return;
867 path = moduledir_fullpath(mdp, "linker.hints");
868 if (stat(path, &st) != 0 ||
869 st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) ||
870 st.st_size > 100 * 1024 || (fd = open(path, O_RDONLY)) < 0) {
871 free(path);
872 mdp->d_flags |= MDIR_NOHINTS;
873 return;
874 }
875 free(path);
876 size = read(fd, &version, sizeof(version));
877 if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
878 goto bad;
879 size = st.st_size - size;
880 mdp->d_hints = malloc(size);
881 if (mdp->d_hints == NULL)
882 goto bad;
883 if (read(fd, mdp->d_hints, size) != size)
884 goto bad;
885 mdp->d_hintsz = size;
886 close(fd);
887 return;
888 bad:
889 close(fd);
890 if (mdp->d_hints) {
891 free(mdp->d_hints);
892 mdp->d_hints = NULL;
893 }
894 mdp->d_flags |= MDIR_NOHINTS;
895 return;
896 }
897
898 /*
899 * Extract directories from the ';' separated list, remove duplicates.
900 */
901 static void
902 moduledir_re |