Commit | Line | Data |
---|---|---|
33d3dfff | 1 | #include <linux/fanotify.h> |
11637e4b | 2 | #include <linux/fcntl.h> |
2a3edf86 | 3 | #include <linux/file.h> |
11637e4b | 4 | #include <linux/fs.h> |
52c923dd | 5 | #include <linux/anon_inodes.h> |
11637e4b | 6 | #include <linux/fsnotify_backend.h> |
2a3edf86 | 7 | #include <linux/init.h> |
a1014f10 | 8 | #include <linux/mount.h> |
2a3edf86 | 9 | #include <linux/namei.h> |
a1014f10 | 10 | #include <linux/poll.h> |
11637e4b EP |
11 | #include <linux/security.h> |
12 | #include <linux/syscalls.h> | |
2a3edf86 | 13 | #include <linux/types.h> |
a1014f10 EP |
14 | #include <linux/uaccess.h> |
15 | ||
16 | #include <asm/ioctls.h> | |
11637e4b | 17 | |
33d3dfff | 18 | extern const struct fsnotify_ops fanotify_fsnotify_ops; |
11637e4b | 19 | |
2a3edf86 EP |
20 | static struct kmem_cache *fanotify_mark_cache __read_mostly; |
21 | ||
a1014f10 EP |
22 | /* |
23 | * Get an fsnotify notification event if one exists and is small | |
24 | * enough to fit in "count". Return an error pointer if the count | |
25 | * is not large enough. | |
26 | * | |
27 | * Called with the group->notification_mutex held. | |
28 | */ | |
29 | static struct fsnotify_event *get_one_event(struct fsnotify_group *group, | |
30 | size_t count) | |
31 | { | |
32 | BUG_ON(!mutex_is_locked(&group->notification_mutex)); | |
33 | ||
34 | pr_debug("%s: group=%p count=%zd\n", __func__, group, count); | |
35 | ||
36 | if (fsnotify_notify_queue_is_empty(group)) | |
37 | return NULL; | |
38 | ||
39 | if (FAN_EVENT_METADATA_LEN > count) | |
40 | return ERR_PTR(-EINVAL); | |
41 | ||
42 | /* held the notification_mutex the whole time, so this is the | |
43 | * same event we peeked above */ | |
44 | return fsnotify_remove_notify_event(group); | |
45 | } | |
46 | ||
22aa425d | 47 | static int create_fd(struct fsnotify_group *group, struct fsnotify_event *event) |
a1014f10 EP |
48 | { |
49 | int client_fd; | |
50 | struct dentry *dentry; | |
51 | struct vfsmount *mnt; | |
52 | struct file *new_file; | |
53 | ||
22aa425d | 54 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); |
a1014f10 EP |
55 | |
56 | client_fd = get_unused_fd(); | |
57 | if (client_fd < 0) | |
58 | return client_fd; | |
59 | ||
60 | if (event->data_type != FSNOTIFY_EVENT_PATH) { | |
61 | WARN_ON(1); | |
62 | put_unused_fd(client_fd); | |
63 | return -EINVAL; | |
64 | } | |
65 | ||
66 | /* | |
67 | * we need a new file handle for the userspace program so it can read even if it was | |
68 | * originally opened O_WRONLY. | |
69 | */ | |
70 | dentry = dget(event->path.dentry); | |
71 | mnt = mntget(event->path.mnt); | |
72 | /* it's possible this event was an overflow event. in that case dentry and mnt | |
73 | * are NULL; That's fine, just don't call dentry open */ | |
74 | if (dentry && mnt) | |
75 | new_file = dentry_open(dentry, mnt, | |
76 | O_RDONLY | O_LARGEFILE | FMODE_NONOTIFY, | |
77 | current_cred()); | |
78 | else | |
79 | new_file = ERR_PTR(-EOVERFLOW); | |
80 | if (IS_ERR(new_file)) { | |
81 | /* | |
82 | * we still send an event even if we can't open the file. this | |
83 | * can happen when say tasks are gone and we try to open their | |
84 | * /proc files or we try to open a WRONLY file like in sysfs | |
85 | * we just send the errno to userspace since there isn't much | |
86 | * else we can do. | |
87 | */ | |
88 | put_unused_fd(client_fd); | |
89 | client_fd = PTR_ERR(new_file); | |
90 | } else { | |
91 | fd_install(client_fd, new_file); | |
92 | } | |
93 | ||
22aa425d | 94 | return client_fd; |
a1014f10 EP |
95 | } |
96 | ||
97 | static ssize_t fill_event_metadata(struct fsnotify_group *group, | |
98 | struct fanotify_event_metadata *metadata, | |
99 | struct fsnotify_event *event) | |
100 | { | |
101 | pr_debug("%s: group=%p metadata=%p event=%p\n", __func__, | |
102 | group, metadata, event); | |
103 | ||
104 | metadata->event_len = FAN_EVENT_METADATA_LEN; | |
105 | metadata->vers = FANOTIFY_METADATA_VERSION; | |
33d3dfff | 106 | metadata->mask = event->mask & FAN_ALL_OUTGOING_EVENTS; |
32c32632 | 107 | metadata->pid = pid_vnr(event->tgid); |
22aa425d | 108 | metadata->fd = create_fd(group, event); |
a1014f10 | 109 | |
22aa425d | 110 | return metadata->fd; |
a1014f10 EP |
111 | } |
112 | ||
113 | static ssize_t copy_event_to_user(struct fsnotify_group *group, | |
114 | struct fsnotify_event *event, | |
115 | char __user *buf) | |
116 | { | |
117 | struct fanotify_event_metadata fanotify_event_metadata; | |
118 | int ret; | |
119 | ||
120 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); | |
121 | ||
122 | ret = fill_event_metadata(group, &fanotify_event_metadata, event); | |
22aa425d | 123 | if (ret < 0) |
a1014f10 EP |
124 | return ret; |
125 | ||
126 | if (copy_to_user(buf, &fanotify_event_metadata, FAN_EVENT_METADATA_LEN)) | |
127 | return -EFAULT; | |
128 | ||
129 | return FAN_EVENT_METADATA_LEN; | |
130 | } | |
131 | ||
132 | /* intofiy userspace file descriptor functions */ | |
133 | static unsigned int fanotify_poll(struct file *file, poll_table *wait) | |
134 | { | |
135 | struct fsnotify_group *group = file->private_data; | |
136 | int ret = 0; | |
137 | ||
138 | poll_wait(file, &group->notification_waitq, wait); | |
139 | mutex_lock(&group->notification_mutex); | |
140 | if (!fsnotify_notify_queue_is_empty(group)) | |
141 | ret = POLLIN | POLLRDNORM; | |
142 | mutex_unlock(&group->notification_mutex); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
147 | static ssize_t fanotify_read(struct file *file, char __user *buf, | |
148 | size_t count, loff_t *pos) | |
149 | { | |
150 | struct fsnotify_group *group; | |
151 | struct fsnotify_event *kevent; | |
152 | char __user *start; | |
153 | int ret; | |
154 | DEFINE_WAIT(wait); | |
155 | ||
156 | start = buf; | |
157 | group = file->private_data; | |
158 | ||
159 | pr_debug("%s: group=%p\n", __func__, group); | |
160 | ||
161 | while (1) { | |
162 | prepare_to_wait(&group->notification_waitq, &wait, TASK_INTERRUPTIBLE); | |
163 | ||
164 | mutex_lock(&group->notification_mutex); | |
165 | kevent = get_one_event(group, count); | |
166 | mutex_unlock(&group->notification_mutex); | |
167 | ||
168 | if (kevent) { | |
169 | ret = PTR_ERR(kevent); | |
170 | if (IS_ERR(kevent)) | |
171 | break; | |
172 | ret = copy_event_to_user(group, kevent, buf); | |
173 | fsnotify_put_event(kevent); | |
174 | if (ret < 0) | |
175 | break; | |
176 | buf += ret; | |
177 | count -= ret; | |
178 | continue; | |
179 | } | |
180 | ||
181 | ret = -EAGAIN; | |
182 | if (file->f_flags & O_NONBLOCK) | |
183 | break; | |
184 | ret = -EINTR; | |
185 | if (signal_pending(current)) | |
186 | break; | |
187 | ||
188 | if (start != buf) | |
189 | break; | |
190 | ||
191 | schedule(); | |
192 | } | |
193 | ||
194 | finish_wait(&group->notification_waitq, &wait); | |
195 | if (start != buf && ret != -EFAULT) | |
196 | ret = buf - start; | |
197 | return ret; | |
198 | } | |
199 | ||
52c923dd EP |
200 | static int fanotify_release(struct inode *ignored, struct file *file) |
201 | { | |
202 | struct fsnotify_group *group = file->private_data; | |
203 | ||
204 | pr_debug("%s: file=%p group=%p\n", __func__, file, group); | |
205 | ||
206 | /* matches the fanotify_init->fsnotify_alloc_group */ | |
207 | fsnotify_put_group(group); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
a1014f10 EP |
212 | static long fanotify_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
213 | { | |
214 | struct fsnotify_group *group; | |
215 | struct fsnotify_event_holder *holder; | |
216 | void __user *p; | |
217 | int ret = -ENOTTY; | |
218 | size_t send_len = 0; | |
219 | ||
220 | group = file->private_data; | |
221 | ||
222 | p = (void __user *) arg; | |
223 | ||
224 | switch (cmd) { | |
225 | case FIONREAD: | |
226 | mutex_lock(&group->notification_mutex); | |
227 | list_for_each_entry(holder, &group->notification_list, event_list) | |
228 | send_len += FAN_EVENT_METADATA_LEN; | |
229 | mutex_unlock(&group->notification_mutex); | |
230 | ret = put_user(send_len, (int __user *) p); | |
231 | break; | |
232 | } | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
52c923dd | 237 | static const struct file_operations fanotify_fops = { |
a1014f10 EP |
238 | .poll = fanotify_poll, |
239 | .read = fanotify_read, | |
52c923dd EP |
240 | .fasync = NULL, |
241 | .release = fanotify_release, | |
a1014f10 EP |
242 | .unlocked_ioctl = fanotify_ioctl, |
243 | .compat_ioctl = fanotify_ioctl, | |
52c923dd EP |
244 | }; |
245 | ||
2a3edf86 EP |
246 | static void fanotify_free_mark(struct fsnotify_mark *fsn_mark) |
247 | { | |
248 | kmem_cache_free(fanotify_mark_cache, fsn_mark); | |
249 | } | |
250 | ||
251 | static int fanotify_find_path(int dfd, const char __user *filename, | |
252 | struct path *path, unsigned int flags) | |
253 | { | |
254 | int ret; | |
255 | ||
256 | pr_debug("%s: dfd=%d filename=%p flags=%x\n", __func__, | |
257 | dfd, filename, flags); | |
258 | ||
259 | if (filename == NULL) { | |
260 | struct file *file; | |
261 | int fput_needed; | |
262 | ||
263 | ret = -EBADF; | |
264 | file = fget_light(dfd, &fput_needed); | |
265 | if (!file) | |
266 | goto out; | |
267 | ||
268 | ret = -ENOTDIR; | |
269 | if ((flags & FAN_MARK_ONLYDIR) && | |
270 | !(S_ISDIR(file->f_path.dentry->d_inode->i_mode))) { | |
271 | fput_light(file, fput_needed); | |
272 | goto out; | |
273 | } | |
274 | ||
275 | *path = file->f_path; | |
276 | path_get(path); | |
277 | fput_light(file, fput_needed); | |
278 | } else { | |
279 | unsigned int lookup_flags = 0; | |
280 | ||
281 | if (!(flags & FAN_MARK_DONT_FOLLOW)) | |
282 | lookup_flags |= LOOKUP_FOLLOW; | |
283 | if (flags & FAN_MARK_ONLYDIR) | |
284 | lookup_flags |= LOOKUP_DIRECTORY; | |
285 | ||
286 | ret = user_path_at(dfd, filename, lookup_flags, path); | |
287 | if (ret) | |
288 | goto out; | |
289 | } | |
290 | ||
291 | /* you can only watch an inode if you have read permissions on it */ | |
292 | ret = inode_permission(path->dentry->d_inode, MAY_READ); | |
293 | if (ret) | |
294 | path_put(path); | |
295 | out: | |
296 | return ret; | |
297 | } | |
298 | ||
b9e4e3bd EP |
299 | static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark, |
300 | __u32 mask, | |
301 | unsigned int flags) | |
088b09b0 AG |
302 | { |
303 | __u32 oldmask; | |
304 | ||
305 | spin_lock(&fsn_mark->lock); | |
b9e4e3bd EP |
306 | if (!(flags & FAN_MARK_IGNORED_MASK)) { |
307 | oldmask = fsn_mark->mask; | |
308 | fsnotify_set_mark_mask_locked(fsn_mark, (oldmask & ~mask)); | |
309 | } else { | |
310 | oldmask = fsn_mark->ignored_mask; | |
311 | fsnotify_set_mark_ignored_mask_locked(fsn_mark, (oldmask & ~mask)); | |
312 | } | |
088b09b0 AG |
313 | spin_unlock(&fsn_mark->lock); |
314 | ||
315 | if (!(oldmask & ~mask)) | |
316 | fsnotify_destroy_mark(fsn_mark); | |
317 | ||
318 | return mask & oldmask; | |
319 | } | |
320 | ||
f3640192 | 321 | static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
322 | struct vfsmount *mnt, __u32 mask, |
323 | unsigned int flags) | |
88826276 EP |
324 | { |
325 | struct fsnotify_mark *fsn_mark = NULL; | |
088b09b0 | 326 | __u32 removed; |
88826276 | 327 | |
f3640192 AG |
328 | fsn_mark = fsnotify_find_vfsmount_mark(group, mnt); |
329 | if (!fsn_mark) | |
330 | return -ENOENT; | |
88826276 | 331 | |
b9e4e3bd | 332 | removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags); |
f3640192 AG |
333 | fsnotify_put_mark(fsn_mark); |
334 | if (removed & group->mask) | |
335 | fsnotify_recalc_group_mask(group); | |
336 | if (removed & mnt->mnt_fsnotify_mask) | |
337 | fsnotify_recalc_vfsmount_mask(mnt); | |
338 | ||
339 | return 0; | |
340 | } | |
2a3edf86 | 341 | |
f3640192 | 342 | static int fanotify_remove_inode_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
343 | struct inode *inode, __u32 mask, |
344 | unsigned int flags) | |
f3640192 AG |
345 | { |
346 | struct fsnotify_mark *fsn_mark = NULL; | |
347 | __u32 removed; | |
348 | ||
349 | fsn_mark = fsnotify_find_inode_mark(group, inode); | |
88826276 EP |
350 | if (!fsn_mark) |
351 | return -ENOENT; | |
352 | ||
b9e4e3bd | 353 | removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags); |
5444e298 | 354 | /* matches the fsnotify_find_inode_mark() */ |
2a3edf86 EP |
355 | fsnotify_put_mark(fsn_mark); |
356 | ||
088b09b0 AG |
357 | if (removed & group->mask) |
358 | fsnotify_recalc_group_mask(group); | |
f3640192 AG |
359 | if (removed & inode->i_fsnotify_mask) |
360 | fsnotify_recalc_inode_mask(inode); | |
088b09b0 | 361 | |
2a3edf86 EP |
362 | return 0; |
363 | } | |
364 | ||
b9e4e3bd EP |
365 | static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark, |
366 | __u32 mask, | |
367 | unsigned int flags) | |
912ee394 AG |
368 | { |
369 | __u32 oldmask; | |
370 | ||
371 | spin_lock(&fsn_mark->lock); | |
b9e4e3bd EP |
372 | if (!(flags & FAN_MARK_IGNORED_MASK)) { |
373 | oldmask = fsn_mark->mask; | |
374 | fsnotify_set_mark_mask_locked(fsn_mark, (oldmask | mask)); | |
375 | } else { | |
376 | oldmask = fsn_mark->ignored_mask; | |
377 | fsnotify_set_mark_ignored_mask_locked(fsn_mark, (oldmask | mask)); | |
c9778a98 EP |
378 | if (flags & FAN_MARK_IGNORED_SURV_MODIFY) |
379 | fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY; | |
b9e4e3bd | 380 | } |
912ee394 AG |
381 | spin_unlock(&fsn_mark->lock); |
382 | ||
383 | return mask & ~oldmask; | |
384 | } | |
385 | ||
52202dfb | 386 | static int fanotify_add_vfsmount_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
387 | struct vfsmount *mnt, __u32 mask, |
388 | unsigned int flags) | |
2a3edf86 EP |
389 | { |
390 | struct fsnotify_mark *fsn_mark; | |
912ee394 | 391 | __u32 added; |
2a3edf86 | 392 | |
88826276 EP |
393 | fsn_mark = fsnotify_find_vfsmount_mark(group, mnt); |
394 | if (!fsn_mark) { | |
88826276 EP |
395 | int ret; |
396 | ||
912ee394 AG |
397 | fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL); |
398 | if (!fsn_mark) | |
52202dfb | 399 | return -ENOMEM; |
88826276 | 400 | |
912ee394 AG |
401 | fsnotify_init_mark(fsn_mark, fanotify_free_mark); |
402 | ret = fsnotify_add_mark(fsn_mark, group, NULL, mnt, 0); | |
88826276 | 403 | if (ret) { |
912ee394 | 404 | fanotify_free_mark(fsn_mark); |
52202dfb | 405 | return ret; |
88826276 | 406 | } |
88826276 | 407 | } |
b9e4e3bd | 408 | added = fanotify_mark_add_to_mask(fsn_mark, mask, flags); |
52202dfb | 409 | fsnotify_put_mark(fsn_mark); |
912ee394 AG |
410 | if (added) { |
411 | if (added & ~group->mask) | |
412 | fsnotify_recalc_group_mask(group); | |
413 | if (added & ~mnt->mnt_fsnotify_mask) | |
414 | fsnotify_recalc_vfsmount_mask(mnt); | |
415 | } | |
52202dfb | 416 | return 0; |
88826276 EP |
417 | } |
418 | ||
52202dfb | 419 | static int fanotify_add_inode_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
420 | struct inode *inode, __u32 mask, |
421 | unsigned int flags) | |
88826276 EP |
422 | { |
423 | struct fsnotify_mark *fsn_mark; | |
912ee394 | 424 | __u32 added; |
88826276 EP |
425 | |
426 | pr_debug("%s: group=%p inode=%p\n", __func__, group, inode); | |
2a3edf86 | 427 | |
5444e298 | 428 | fsn_mark = fsnotify_find_inode_mark(group, inode); |
2a3edf86 | 429 | if (!fsn_mark) { |
88826276 | 430 | int ret; |
2a3edf86 | 431 | |
912ee394 AG |
432 | fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL); |
433 | if (!fsn_mark) | |
52202dfb | 434 | return -ENOMEM; |
2a3edf86 | 435 | |
912ee394 AG |
436 | fsnotify_init_mark(fsn_mark, fanotify_free_mark); |
437 | ret = fsnotify_add_mark(fsn_mark, group, inode, NULL, 0); | |
2a3edf86 | 438 | if (ret) { |
912ee394 | 439 | fanotify_free_mark(fsn_mark); |
52202dfb | 440 | return ret; |
2a3edf86 | 441 | } |
2a3edf86 | 442 | } |
b9e4e3bd | 443 | added = fanotify_mark_add_to_mask(fsn_mark, mask, flags); |
52202dfb | 444 | fsnotify_put_mark(fsn_mark); |
912ee394 AG |
445 | if (added) { |
446 | if (added & ~group->mask) | |
447 | fsnotify_recalc_group_mask(group); | |
448 | if (added & ~inode->i_fsnotify_mask) | |
449 | fsnotify_recalc_inode_mask(inode); | |
450 | } | |
52202dfb | 451 | return 0; |
88826276 | 452 | } |
2a3edf86 | 453 | |
52c923dd | 454 | /* fanotify syscalls */ |
11637e4b EP |
455 | SYSCALL_DEFINE3(fanotify_init, unsigned int, flags, unsigned int, event_f_flags, |
456 | unsigned int, priority) | |
457 | { | |
52c923dd EP |
458 | struct fsnotify_group *group; |
459 | int f_flags, fd; | |
460 | ||
461 | pr_debug("%s: flags=%d event_f_flags=%d priority=%d\n", | |
462 | __func__, flags, event_f_flags, priority); | |
463 | ||
464 | if (event_f_flags) | |
465 | return -EINVAL; | |
466 | if (priority) | |
467 | return -EINVAL; | |
468 | ||
469 | if (!capable(CAP_SYS_ADMIN)) | |
470 | return -EACCES; | |
471 | ||
472 | if (flags & ~FAN_ALL_INIT_FLAGS) | |
473 | return -EINVAL; | |
474 | ||
475 | f_flags = (O_RDONLY | FMODE_NONOTIFY); | |
476 | if (flags & FAN_CLOEXEC) | |
477 | f_flags |= O_CLOEXEC; | |
478 | if (flags & FAN_NONBLOCK) | |
479 | f_flags |= O_NONBLOCK; | |
480 | ||
481 | /* fsnotify_alloc_group takes a ref. Dropped in fanotify_release */ | |
482 | group = fsnotify_alloc_group(&fanotify_fsnotify_ops); | |
483 | if (IS_ERR(group)) | |
484 | return PTR_ERR(group); | |
485 | ||
486 | fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags); | |
487 | if (fd < 0) | |
488 | goto out_put_group; | |
489 | ||
490 | return fd; | |
491 | ||
492 | out_put_group: | |
493 | fsnotify_put_group(group); | |
494 | return fd; | |
11637e4b | 495 | } |
bbaa4168 | 496 | |
9bbfc964 HC |
497 | SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags, |
498 | __u64 mask, int dfd, | |
499 | const char __user * pathname) | |
bbaa4168 | 500 | { |
0ff21db9 EP |
501 | struct inode *inode = NULL; |
502 | struct vfsmount *mnt = NULL; | |
2a3edf86 EP |
503 | struct fsnotify_group *group; |
504 | struct file *filp; | |
505 | struct path path; | |
506 | int ret, fput_needed; | |
507 | ||
508 | pr_debug("%s: fanotify_fd=%d flags=%x dfd=%d pathname=%p mask=%llx\n", | |
509 | __func__, fanotify_fd, flags, dfd, pathname, mask); | |
510 | ||
511 | /* we only use the lower 32 bits as of right now. */ | |
512 | if (mask & ((__u64)0xffffffff << 32)) | |
513 | return -EINVAL; | |
514 | ||
88380fe6 AG |
515 | if (flags & ~FAN_ALL_MARK_FLAGS) |
516 | return -EINVAL; | |
4d92604c | 517 | switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) { |
88380fe6 AG |
518 | case FAN_MARK_ADD: |
519 | case FAN_MARK_REMOVE: | |
4d92604c | 520 | case FAN_MARK_FLUSH: |
88380fe6 AG |
521 | break; |
522 | default: | |
523 | return -EINVAL; | |
524 | } | |
525 | if (mask & ~(FAN_ALL_EVENTS | FAN_EVENT_ON_CHILD)) | |
2a3edf86 EP |
526 | return -EINVAL; |
527 | ||
528 | filp = fget_light(fanotify_fd, &fput_needed); | |
529 | if (unlikely(!filp)) | |
530 | return -EBADF; | |
531 | ||
532 | /* verify that this is indeed an fanotify instance */ | |
533 | ret = -EINVAL; | |
534 | if (unlikely(filp->f_op != &fanotify_fops)) | |
535 | goto fput_and_out; | |
536 | ||
537 | ret = fanotify_find_path(dfd, pathname, &path, flags); | |
538 | if (ret) | |
539 | goto fput_and_out; | |
540 | ||
541 | /* inode held in place by reference to path; group by fget on fd */ | |
eac8e9e8 | 542 | if (!(flags & FAN_MARK_MOUNT)) |
0ff21db9 EP |
543 | inode = path.dentry->d_inode; |
544 | else | |
545 | mnt = path.mnt; | |
2a3edf86 EP |
546 | group = filp->private_data; |
547 | ||
548 | /* create/update an inode mark */ | |
4d92604c | 549 | switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) { |
c6223f46 | 550 | case FAN_MARK_ADD: |
eac8e9e8 | 551 | if (flags & FAN_MARK_MOUNT) |
b9e4e3bd | 552 | ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags); |
0ff21db9 | 553 | else |
b9e4e3bd | 554 | ret = fanotify_add_inode_mark(group, inode, mask, flags); |
c6223f46 AG |
555 | break; |
556 | case FAN_MARK_REMOVE: | |
f3640192 | 557 | if (flags & FAN_MARK_MOUNT) |
b9e4e3bd | 558 | ret = fanotify_remove_vfsmount_mark(group, mnt, mask, flags); |
f3640192 | 559 | else |
b9e4e3bd | 560 | ret = fanotify_remove_inode_mark(group, inode, mask, flags); |
c6223f46 | 561 | break; |
4d92604c EP |
562 | case FAN_MARK_FLUSH: |
563 | if (flags & FAN_MARK_MOUNT) | |
564 | fsnotify_clear_vfsmount_marks_by_group(group); | |
565 | else | |
566 | fsnotify_clear_inode_marks_by_group(group); | |
567 | fsnotify_recalc_group_mask(group); | |
568 | break; | |
c6223f46 AG |
569 | default: |
570 | ret = -EINVAL; | |
571 | } | |
2a3edf86 EP |
572 | |
573 | path_put(&path); | |
574 | fput_and_out: | |
575 | fput_light(filp, fput_needed); | |
576 | return ret; | |
577 | } | |
578 | ||
9bbfc964 HC |
579 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
580 | asmlinkage long SyS_fanotify_mark(long fanotify_fd, long flags, __u64 mask, | |
581 | long dfd, long pathname) | |
582 | { | |
583 | return SYSC_fanotify_mark((int) fanotify_fd, (unsigned int) flags, | |
584 | mask, (int) dfd, | |
585 | (const char __user *) pathname); | |
586 | } | |
587 | SYSCALL_ALIAS(sys_fanotify_mark, SyS_fanotify_mark); | |
588 | #endif | |
589 | ||
2a3edf86 EP |
590 | /* |
591 | * fanotify_user_setup - Our initialization function. Note that we cannnot return | |
592 | * error because we have compiled-in VFS hooks. So an (unlikely) failure here | |
593 | * must result in panic(). | |
594 | */ | |
595 | static int __init fanotify_user_setup(void) | |
596 | { | |
597 | fanotify_mark_cache = KMEM_CACHE(fsnotify_mark, SLAB_PANIC); | |
598 | ||
599 | return 0; | |
bbaa4168 | 600 | } |
2a3edf86 | 601 | device_initcall(fanotify_user_setup); |