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1 | /* |
2 | * binfmt_misc.c |
3 | * |
4 | * Copyright (C) 1997 Richard Günther |
5 | * |
6 | * binfmt_misc detects binaries via a magic or filename extension and invokes |
7 | * a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and |
8 | * binfmt_mz. |
9 | * |
10 | * 1997-04-25 first version |
11 | * [...] |
12 | * 1997-05-19 cleanup |
13 | * 1997-06-26 hpa: pass the real filename rather than argv[0] |
14 | * 1997-06-30 minor cleanup |
15 | * 1997-08-09 removed extension stripping, locking cleanup |
16 | * 2001-02-28 AV: rewritten into something that resembles C. Original didn't. |
17 | */ |
18 | |
19 | #include <linux/module.h> |
20 | #include <linux/init.h> |
21 | #include <linux/sched.h> |
22 | #include <linux/binfmts.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/ctype.h> |
25 | #include <linux/file.h> |
26 | #include <linux/pagemap.h> |
27 | #include <linux/namei.h> |
28 | #include <linux/mount.h> |
29 | #include <linux/syscalls.h> |
30 | #include <linux/fs.h> |
31 | |
32 | #include <asm/uaccess.h> |
33 | |
34 | enum { |
35 | VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */ |
36 | }; |
37 | |
38 | static LIST_HEAD(entries); |
39 | static int enabled = 1; |
40 | |
41 | enum {Enabled, Magic}; |
42 | #define MISC_FMT_PRESERVE_ARGV0 (1<<31) |
43 | #define MISC_FMT_OPEN_BINARY (1<<30) |
44 | #define MISC_FMT_CREDENTIALS (1<<29) |
45 | |
46 | typedef struct { |
47 | struct list_head list; |
48 | unsigned long flags; /* type, status, etc. */ |
49 | int offset; /* offset of magic */ |
50 | int size; /* size of magic/mask */ |
51 | char *magic; /* magic or filename extension */ |
52 | char *mask; /* mask, NULL for exact match */ |
53 | char *interpreter; /* filename of interpreter */ |
54 | char *name; |
55 | struct dentry *dentry; |
56 | } Node; |
57 | |
58 | static DEFINE_RWLOCK(entries_lock); |
59 | static struct file_system_type bm_fs_type; |
60 | static struct vfsmount *bm_mnt; |
61 | static int entry_count; |
62 | |
63 | /* |
64 | * Check if we support the binfmt |
65 | * if we do, return the node, else NULL |
66 | * locking is done in load_misc_binary |
67 | */ |
68 | static Node *check_file(struct linux_binprm *bprm) |
69 | { |
70 | char *p = strrchr(bprm->interp, '.'); |
71 | struct list_head *l; |
72 | |
73 | list_for_each(l, &entries) { |
74 | Node *e = list_entry(l, Node, list); |
75 | char *s; |
76 | int j; |
77 | |
78 | if (!test_bit(Enabled, &e->flags)) |
79 | continue; |
80 | |
81 | if (!test_bit(Magic, &e->flags)) { |
82 | if (p && !strcmp(e->magic, p + 1)) |
83 | return e; |
84 | continue; |
85 | } |
86 | |
87 | s = bprm->buf + e->offset; |
88 | if (e->mask) { |
89 | for (j = 0; j < e->size; j++) |
90 | if ((*s++ ^ e->magic[j]) & e->mask[j]) |
91 | break; |
92 | } else { |
93 | for (j = 0; j < e->size; j++) |
94 | if ((*s++ ^ e->magic[j])) |
95 | break; |
96 | } |
97 | if (j == e->size) |
98 | return e; |
99 | } |
100 | return NULL; |
101 | } |
102 | |
103 | /* |
104 | * the loader itself |
105 | */ |
106 | static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
107 | { |
108 | Node *fmt; |
109 | struct file * interp_file = NULL; |
110 | char iname[BINPRM_BUF_SIZE]; |
111 | char *iname_addr = iname; |
112 | int retval; |
113 | int fd_binary = -1; |
114 | |
115 | retval = -ENOEXEC; |
116 | if (!enabled) |
117 | goto _ret; |
118 | |
119 | retval = -ENOEXEC; |
120 | if (bprm->recursion_depth > BINPRM_MAX_RECURSION) |
121 | goto _ret; |
122 | |
123 | /* to keep locking time low, we copy the interpreter string */ |
124 | read_lock(&entries_lock); |
125 | fmt = check_file(bprm); |
126 | if (fmt) |
127 | strlcpy(iname, fmt->interpreter, BINPRM_BUF_SIZE); |
128 | read_unlock(&entries_lock); |
129 | if (!fmt) |
130 | goto _ret; |
131 | |
132 | if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) { |
133 | retval = remove_arg_zero(bprm); |
134 | if (retval) |
135 | goto _ret; |
136 | } |
137 | |
138 | if (fmt->flags & MISC_FMT_OPEN_BINARY) { |
139 | |
140 | /* if the binary should be opened on behalf of the |
141 | * interpreter than keep it open and assign descriptor |
142 | * to it */ |
143 | fd_binary = get_unused_fd(); |
144 | if (fd_binary < 0) { |
145 | retval = fd_binary; |
146 | goto _ret; |
147 | } |
148 | fd_install(fd_binary, bprm->file); |
149 | |
150 | /* if the binary is not readable than enforce mm->dumpable=0 |
151 | regardless of the interpreter's permissions */ |
152 | if (file_permission(bprm->file, MAY_READ)) |
153 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; |
154 | |
155 | allow_write_access(bprm->file); |
156 | bprm->file = NULL; |
157 | |
158 | /* mark the bprm that fd should be passed to interp */ |
159 | bprm->interp_flags |= BINPRM_FLAGS_EXECFD; |
160 | bprm->interp_data = fd_binary; |
161 | |
162 | } else { |
163 | allow_write_access(bprm->file); |
164 | fput(bprm->file); |
165 | bprm->file = NULL; |
166 | } |
167 | /* make argv[1] be the path to the binary */ |
168 | retval = copy_strings_kernel (1, &bprm->interp, bprm); |
169 | if (retval < 0) |
170 | goto _error; |
171 | bprm->argc++; |
172 | |
173 | /* add the interp as argv[0] */ |
174 | retval = copy_strings_kernel (1, &iname_addr, bprm); |
175 | if (retval < 0) |
176 | goto _error; |
177 | bprm->argc ++; |
178 | |
179 | bprm->interp = iname; /* for binfmt_script */ |
180 | |
181 | interp_file = open_exec (iname); |
182 | retval = PTR_ERR (interp_file); |
183 | if (IS_ERR (interp_file)) |
184 | goto _error; |
185 | |
186 | bprm->file = interp_file; |
187 | if (fmt->flags & MISC_FMT_CREDENTIALS) { |
188 | /* |
189 | * No need to call prepare_binprm(), it's already been |
190 | * done. bprm->buf is stale, update from interp_file. |
191 | */ |
192 | memset(bprm->buf, 0, BINPRM_BUF_SIZE); |
193 | retval = kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE); |
194 | } else |
195 | retval = prepare_binprm (bprm); |
196 | |
197 | if (retval < 0) |
198 | goto _error; |
199 | |
200 | bprm->recursion_depth++; |
201 | |
202 | retval = search_binary_handler (bprm, regs); |
203 | if (retval < 0) |
204 | goto _error; |
205 | |
206 | _ret: |
207 | return retval; |
208 | _error: |
209 | if (fd_binary > 0) |
210 | sys_close(fd_binary); |
211 | bprm->interp_flags = 0; |
212 | bprm->interp_data = 0; |
213 | goto _ret; |
214 | } |
215 | |
216 | /* Command parsers */ |
217 | |
218 | /* |
219 | * parses and copies one argument enclosed in del from *sp to *dp, |
220 | * recognising the \x special. |
221 | * returns pointer to the copied argument or NULL in case of an |
222 | * error (and sets err) or null argument length. |
223 | */ |
224 | static char *scanarg(char *s, char del) |
225 | { |
226 | char c; |
227 | |
228 | while ((c = *s++) != del) { |
229 | if (c == '\\' && *s == 'x') { |
230 | s++; |
231 | if (!isxdigit(*s++)) |
232 | return NULL; |
233 | if (!isxdigit(*s++)) |
234 | return NULL; |
235 | } |
236 | } |
237 | return s; |
238 | } |
239 | |
240 | static int unquote(char *from) |
241 | { |
242 | char c = 0, *s = from, *p = from; |
243 | |
244 | while ((c = *s++) != '\0') { |
245 | if (c == '\\' && *s == 'x') { |
246 | s++; |
247 | c = toupper(*s++); |
248 | *p = (c - (isdigit(c) ? '0' : 'A' - 10)) << 4; |
249 | c = toupper(*s++); |
250 | *p++ |= c - (isdigit(c) ? '0' : 'A' - 10); |
251 | continue; |
252 | } |
253 | *p++ = c; |
254 | } |
255 | return p - from; |
256 | } |
257 | |
258 | static char * check_special_flags (char * sfs, Node * e) |
259 | { |
260 | char * p = sfs; |
261 | int cont = 1; |
262 | |
263 | /* special flags */ |
264 | while (cont) { |
265 | switch (*p) { |
266 | case 'P': |
267 | p++; |
268 | e->flags |= MISC_FMT_PRESERVE_ARGV0; |
269 | break; |
270 | case 'O': |
271 | p++; |
272 | e->flags |= MISC_FMT_OPEN_BINARY; |
273 | break; |
274 | case 'C': |
275 | p++; |
276 | /* this flags also implies the |
277 | open-binary flag */ |
278 | e->flags |= (MISC_FMT_CREDENTIALS | |
279 | MISC_FMT_OPEN_BINARY); |
280 | break; |
281 | default: |
282 | cont = 0; |
283 | } |
284 | } |
285 | |
286 | return p; |
287 | } |
288 | /* |
289 | * This registers a new binary format, it recognises the syntax |
290 | * ':name:type:offset:magic:mask:interpreter:flags' |
291 | * where the ':' is the IFS, that can be chosen with the first char |
292 | */ |
293 | static Node *create_entry(const char __user *buffer, size_t count) |
294 | { |
295 | Node *e; |
296 | int memsize, err; |
297 | char *buf, *p; |
298 | char del; |
299 | |
300 | /* some sanity checks */ |
301 | err = -EINVAL; |
302 | if ((count < 11) || (count > 256)) |
303 | goto out; |
304 | |
305 | err = -ENOMEM; |
306 | memsize = sizeof(Node) + count + 8; |
307 | e = kmalloc(memsize, GFP_USER); |
308 | if (!e) |
309 | goto out; |
310 | |
311 | p = buf = (char *)e + sizeof(Node); |
312 | |
313 | memset(e, 0, sizeof(Node)); |
314 | if (copy_from_user(buf, buffer, count)) |
315 | goto Efault; |
316 | |
317 | del = *p++; /* delimeter */ |
318 | |
319 | memset(buf+count, del, 8); |
320 | |
321 | e->name = p; |
322 | p = strchr(p, del); |
323 | if (!p) |
324 | goto Einval; |
325 | *p++ = '\0'; |
326 | if (!e->name[0] || |
327 | !strcmp(e->name, ".") || |
328 | !strcmp(e->name, "..") || |
329 | strchr(e->name, '/')) |
330 | goto Einval; |
331 | switch (*p++) { |
332 | case 'E': e->flags = 1<<Enabled; break; |
333 | case 'M': e->flags = (1<<Enabled) | (1<<Magic); break; |
334 | default: goto Einval; |
335 | } |
336 | if (*p++ != del) |
337 | goto Einval; |
338 | if (test_bit(Magic, &e->flags)) { |
339 | char *s = strchr(p, del); |
340 | if (!s) |
341 | goto Einval; |
342 | *s++ = '\0'; |
343 | e->offset = simple_strtoul(p, &p, 10); |
344 | if (*p++) |
345 | goto Einval; |
346 | e->magic = p; |
347 | p = scanarg(p, del); |
348 | if (!p) |
349 | goto Einval; |
350 | p[-1] = '\0'; |
351 | if (!e->magic[0]) |
352 | goto Einval; |
353 | e->mask = p; |
354 | p = scanarg(p, del); |
355 | if (!p) |
356 | goto Einval; |
357 | p[-1] = '\0'; |
358 | if (!e->mask[0]) |
359 | e->mask = NULL; |
360 | e->size = unquote(e->magic); |
361 | if (e->mask && unquote(e->mask) != e->size) |
362 | goto Einval; |
363 | if (e->size + e->offset > BINPRM_BUF_SIZE) |
364 | goto Einval; |
365 | } else { |
366 | p = strchr(p, del); |
367 | if (!p) |
368 | goto Einval; |
369 | *p++ = '\0'; |
370 | e->magic = p; |
371 | p = strchr(p, del); |
372 | if (!p) |
373 | goto Einval; |
374 | *p++ = '\0'; |
375 | if (!e->magic[0] || strchr(e->magic, '/')) |
376 | goto Einval; |
377 | p = strchr(p, del); |
378 | if (!p) |
379 | goto Einval; |
380 | *p++ = '\0'; |
381 | } |
382 | e->interpreter = p; |
383 | p = strchr(p, del); |
384 | if (!p) |
385 | goto Einval; |
386 | *p++ = '\0'; |
387 | if (!e->interpreter[0]) |
388 | goto Einval; |
389 | |
390 | |
391 | p = check_special_flags (p, e); |
392 | |
393 | if (*p == '\n') |
394 | p++; |
395 | if (p != buf + count) |
396 | goto Einval; |
397 | return e; |
398 | |
399 | out: |
400 | return ERR_PTR(err); |
401 | |
402 | Efault: |
403 | kfree(e); |
404 | return ERR_PTR(-EFAULT); |
405 | Einval: |
406 | kfree(e); |
407 | return ERR_PTR(-EINVAL); |
408 | } |
409 | |
410 | /* |
411 | * Set status of entry/binfmt_misc: |
412 | * '1' enables, '0' disables and '-1' clears entry/binfmt_misc |
413 | */ |
414 | static int parse_command(const char __user *buffer, size_t count) |
415 | { |
416 | char s[4]; |
417 | |
418 | if (!count) |
419 | return 0; |
420 | if (count > 3) |
421 | return -EINVAL; |
422 | if (copy_from_user(s, buffer, count)) |
423 | return -EFAULT; |
424 | if (s[count-1] == '\n') |
425 | count--; |
426 | if (count == 1 && s[0] == '0') |
427 | return 1; |
428 | if (count == 1 && s[0] == '1') |
429 | return 2; |
430 | if (count == 2 && s[0] == '-' && s[1] == '1') |
431 | return 3; |
432 | return -EINVAL; |
433 | } |
434 | |
435 | /* generic stuff */ |
436 | |
437 | static void entry_status(Node *e, char *page) |
438 | { |
439 | char *dp; |
440 | char *status = "disabled"; |
441 | const char * flags = "flags: "; |
442 | |
443 | if (test_bit(Enabled, &e->flags)) |
444 | status = "enabled"; |
445 | |
446 | if (!VERBOSE_STATUS) { |
447 | sprintf(page, "%s\n", status); |
448 | return; |
449 | } |
450 | |
451 | sprintf(page, "%s\ninterpreter %s\n", status, e->interpreter); |
452 | dp = page + strlen(page); |
453 | |
454 | /* print the special flags */ |
455 | sprintf (dp, "%s", flags); |
456 | dp += strlen (flags); |
457 | if (e->flags & MISC_FMT_PRESERVE_ARGV0) { |
458 | *dp ++ = 'P'; |
459 | } |
460 | if (e->flags & MISC_FMT_OPEN_BINARY) { |
461 | *dp ++ = 'O'; |
462 | } |
463 | if (e->flags & MISC_FMT_CREDENTIALS) { |
464 | *dp ++ = 'C'; |
465 | } |
466 | *dp ++ = '\n'; |
467 | |
468 | |
469 | if (!test_bit(Magic, &e->flags)) { |
470 | sprintf(dp, "extension .%s\n", e->magic); |
471 | } else { |
472 | int i; |
473 | |
474 | sprintf(dp, "offset %i\nmagic ", e->offset); |
475 | dp = page + strlen(page); |
476 | for (i = 0; i < e->size; i++) { |
477 | sprintf(dp, "%02x", 0xff & (int) (e->magic[i])); |
478 | dp += 2; |
479 | } |
480 | if (e->mask) { |
481 | sprintf(dp, "\nmask "); |
482 | dp += 6; |
483 | for (i = 0; i < e->size; i++) { |
484 | sprintf(dp, "%02x", 0xff & (int) (e->mask[i])); |
485 | dp += 2; |
486 | } |
487 | } |
488 | *dp++ = '\n'; |
489 | *dp = '\0'; |
490 | } |
491 | } |
492 | |
493 | static struct inode *bm_get_inode(struct super_block *sb, int mode) |
494 | { |
495 | struct inode * inode = new_inode(sb); |
496 | |
497 | if (inode) { |
498 | inode->i_mode = mode; |
499 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
500 | current_fs_time(inode->i_sb); |
501 | } |
502 | return inode; |
503 | } |
504 | |
505 | static void bm_clear_inode(struct inode *inode) |
506 | { |
507 | kfree(inode->i_private); |
508 | } |
509 | |
510 | static void kill_node(Node *e) |
511 | { |
512 | struct dentry *dentry; |
513 | |
514 | write_lock(&entries_lock); |
515 | dentry = e->dentry; |
516 | if (dentry) { |
517 | list_del_init(&e->list); |
518 | e->dentry = NULL; |
519 | } |
520 | write_unlock(&entries_lock); |
521 | |
522 | if (dentry) { |
523 | dentry->d_inode->i_nlink--; |
524 | d_drop(dentry); |
525 | dput(dentry); |
526 | simple_release_fs(&bm_mnt, &entry_count); |
527 | } |
528 | } |
529 | |
530 | /* /<entry> */ |
531 | |
532 | static ssize_t |
533 | bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos) |
534 | { |
535 | Node *e = file->f_path.dentry->d_inode->i_private; |
536 | ssize_t res; |
537 | char *page; |
538 | |
539 | if (!(page = (char*) __get_free_page(GFP_KERNEL))) |
540 | return -ENOMEM; |
541 | |
542 | entry_status(e, page); |
543 | |
544 | res = simple_read_from_buffer(buf, nbytes, ppos, page, strlen(page)); |
545 | |
546 | free_page((unsigned long) page); |
547 | return res; |
548 | } |
549 | |
550 | static ssize_t bm_entry_write(struct file *file, const char __user *buffer, |
551 | size_t count, loff_t *ppos) |
552 | { |
553 | struct dentry *root; |
554 | Node *e = file->f_path.dentry->d_inode->i_private; |
555 | int res = parse_command(buffer, count); |
556 | |
557 | switch (res) { |
558 | case 1: clear_bit(Enabled, &e->flags); |
559 | break; |
560 | case 2: set_bit(Enabled, &e->flags); |
561 | break; |
562 | case 3: root = dget(file->f_path.mnt->mnt_sb->s_root); |
563 | mutex_lock(&root->d_inode->i_mutex); |
564 | |
565 | kill_node(e); |
566 | |
567 | mutex_unlock(&root->d_inode->i_mutex); |
568 | dput(root); |
569 | break; |
570 | default: return res; |
571 | } |
572 | return count; |
573 | } |
574 | |
575 | static const struct file_operations bm_entry_operations = { |
576 | .read = bm_entry_read, |
577 | .write = bm_entry_write, |
578 | }; |
579 | |
580 | /* /register */ |
581 | |
582 | static ssize_t bm_register_write(struct file *file, const char __user *buffer, |
583 | size_t count, loff_t *ppos) |
584 | { |
585 | Node *e; |
586 | struct inode *inode; |
587 | struct dentry *root, *dentry; |
588 | struct super_block *sb = file->f_path.mnt->mnt_sb; |
589 | int err = 0; |
590 | |
591 | e = create_entry(buffer, count); |
592 | |
593 | if (IS_ERR(e)) |
594 | return PTR_ERR(e); |
595 | |
596 | root = dget(sb->s_root); |
597 | mutex_lock(&root->d_inode->i_mutex); |
598 | dentry = lookup_one_len(e->name, root, strlen(e->name)); |
599 | err = PTR_ERR(dentry); |
600 | if (IS_ERR(dentry)) |
601 | goto out; |
602 | |
603 | err = -EEXIST; |
604 | if (dentry->d_inode) |
605 | goto out2; |
606 | |
607 | inode = bm_get_inode(sb, S_IFREG | 0644); |
608 | |
609 | err = -ENOMEM; |
610 | if (!inode) |
611 | goto out2; |
612 | |
613 | err = simple_pin_fs(&bm_fs_type, &bm_mnt, &entry_count); |
614 | if (err) { |
615 | iput(inode); |
616 | inode = NULL; |
617 | goto out2; |
618 | } |
619 | |
620 | e->dentry = dget(dentry); |
621 | inode->i_private = e; |
622 | inode->i_fop = &bm_entry_operations; |
623 | |
624 | d_instantiate(dentry, inode); |
625 | write_lock(&entries_lock); |
626 | list_add(&e->list, &entries); |
627 | write_unlock(&entries_lock); |
628 | |
629 | err = 0; |
630 | out2: |
631 | dput(dentry); |
632 | out: |
633 | mutex_unlock(&root->d_inode->i_mutex); |
634 | dput(root); |
635 | |
636 | if (err) { |
637 | kfree(e); |
638 | return -EINVAL; |
639 | } |
640 | return count; |
641 | } |
642 | |
643 | static const struct file_operations bm_register_operations = { |
644 | .write = bm_register_write, |
645 | }; |
646 | |
647 | /* /status */ |
648 | |
649 | static ssize_t |
650 | bm_status_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) |
651 | { |
652 | char *s = enabled ? "enabled\n" : "disabled\n"; |
653 | |
654 | return simple_read_from_buffer(buf, nbytes, ppos, s, strlen(s)); |
655 | } |
656 | |
657 | static ssize_t bm_status_write(struct file * file, const char __user * buffer, |
658 | size_t count, loff_t *ppos) |
659 | { |
660 | int res = parse_command(buffer, count); |
661 | struct dentry *root; |
662 | |
663 | switch (res) { |
664 | case 1: enabled = 0; break; |
665 | case 2: enabled = 1; break; |
666 | case 3: root = dget(file->f_path.mnt->mnt_sb->s_root); |
667 | mutex_lock(&root->d_inode->i_mutex); |
668 | |
669 | while (!list_empty(&entries)) |
670 | kill_node(list_entry(entries.next, Node, list)); |
671 | |
672 | mutex_unlock(&root->d_inode->i_mutex); |
673 | dput(root); |
674 | default: return res; |
675 | } |
676 | return count; |
677 | } |
678 | |
679 | static const struct file_operations bm_status_operations = { |
680 | .read = bm_status_read, |
681 | .write = bm_status_write, |
682 | }; |
683 | |
684 | /* Superblock handling */ |
685 | |
686 | static const struct super_operations s_ops = { |
687 | .statfs = simple_statfs, |
688 | .clear_inode = bm_clear_inode, |
689 | }; |
690 | |
691 | static int bm_fill_super(struct super_block * sb, void * data, int silent) |
692 | { |
693 | static struct tree_descr bm_files[] = { |
694 | [2] = {"status", &bm_status_operations, S_IWUSR|S_IRUGO}, |
695 | [3] = {"register", &bm_register_operations, S_IWUSR}, |
696 | /* last one */ {""} |
697 | }; |
698 | int err = simple_fill_super(sb, 0x42494e4d, bm_files); |
699 | if (!err) |
700 | sb->s_op = &s_ops; |
701 | return err; |
702 | } |
703 | |
704 | static int bm_get_sb(struct file_system_type *fs_type, |
705 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
706 | { |
707 | return get_sb_single(fs_type, flags, data, bm_fill_super, mnt); |
708 | } |
709 | |
710 | static struct linux_binfmt misc_format = { |
711 | .module = THIS_MODULE, |
712 | .load_binary = load_misc_binary, |
713 | }; |
714 | |
715 | static struct file_system_type bm_fs_type = { |
716 | .owner = THIS_MODULE, |
717 | .name = "binfmt_misc", |
718 | .get_sb = bm_get_sb, |
719 | .kill_sb = kill_litter_super, |
720 | }; |
721 | |
722 | static int __init init_misc_binfmt(void) |
723 | { |
724 | int err = register_filesystem(&bm_fs_type); |
725 | if (!err) { |
726 | err = register_binfmt(&misc_format); |
727 | if (err) |
728 | unregister_filesystem(&bm_fs_type); |
729 | } |
730 | return err; |
731 | } |
732 | |
733 | static void __exit exit_misc_binfmt(void) |
734 | { |
735 | unregister_binfmt(&misc_format); |
736 | unregister_filesystem(&bm_fs_type); |
737 | } |
738 | |
739 | core_initcall(init_misc_binfmt); |
740 | module_exit(exit_misc_binfmt); |
741 | MODULE_LICENSE("GPL"); |
742 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9