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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
33d3dfff | 2 | #include <linux/fanotify.h> |
11637e4b | 3 | #include <linux/fcntl.h> |
2a3edf86 | 4 | #include <linux/file.h> |
11637e4b | 5 | #include <linux/fs.h> |
52c923dd | 6 | #include <linux/anon_inodes.h> |
11637e4b | 7 | #include <linux/fsnotify_backend.h> |
2a3edf86 | 8 | #include <linux/init.h> |
a1014f10 | 9 | #include <linux/mount.h> |
2a3edf86 | 10 | #include <linux/namei.h> |
a1014f10 | 11 | #include <linux/poll.h> |
11637e4b EP |
12 | #include <linux/security.h> |
13 | #include <linux/syscalls.h> | |
e4e047a2 | 14 | #include <linux/slab.h> |
2a3edf86 | 15 | #include <linux/types.h> |
a1014f10 | 16 | #include <linux/uaccess.h> |
91c2e0bc | 17 | #include <linux/compat.h> |
174cd4b1 | 18 | #include <linux/sched/signal.h> |
a1014f10 EP |
19 | |
20 | #include <asm/ioctls.h> | |
11637e4b | 21 | |
c63181e6 | 22 | #include "../../mount.h" |
be77196b | 23 | #include "../fdinfo.h" |
7053aee2 | 24 | #include "fanotify.h" |
c63181e6 | 25 | |
2529a0df | 26 | #define FANOTIFY_DEFAULT_MAX_EVENTS 16384 |
e7099d8a | 27 | #define FANOTIFY_DEFAULT_MAX_MARKS 8192 |
4afeff85 | 28 | #define FANOTIFY_DEFAULT_MAX_LISTENERS 128 |
2529a0df | 29 | |
48149e9d HS |
30 | /* |
31 | * All flags that may be specified in parameter event_f_flags of fanotify_init. | |
32 | * | |
33 | * Internal and external open flags are stored together in field f_flags of | |
34 | * struct file. Only external open flags shall be allowed in event_f_flags. | |
35 | * Internal flags like FMODE_NONOTIFY, FMODE_EXEC, FMODE_NOCMTIME shall be | |
36 | * excluded. | |
37 | */ | |
38 | #define FANOTIFY_INIT_ALL_EVENT_F_BITS ( \ | |
39 | O_ACCMODE | O_APPEND | O_NONBLOCK | \ | |
40 | __O_SYNC | O_DSYNC | O_CLOEXEC | \ | |
41 | O_LARGEFILE | O_NOATIME ) | |
42 | ||
33d3dfff | 43 | extern const struct fsnotify_ops fanotify_fsnotify_ops; |
11637e4b | 44 | |
054c636e | 45 | struct kmem_cache *fanotify_mark_cache __read_mostly; |
7053aee2 | 46 | struct kmem_cache *fanotify_event_cachep __read_mostly; |
f083441b | 47 | struct kmem_cache *fanotify_perm_event_cachep __read_mostly; |
2a3edf86 | 48 | |
a1014f10 EP |
49 | /* |
50 | * Get an fsnotify notification event if one exists and is small | |
51 | * enough to fit in "count". Return an error pointer if the count | |
52 | * is not large enough. | |
53 | * | |
c21dbe20 | 54 | * Called with the group->notification_lock held. |
a1014f10 EP |
55 | */ |
56 | static struct fsnotify_event *get_one_event(struct fsnotify_group *group, | |
57 | size_t count) | |
58 | { | |
ed272640 | 59 | assert_spin_locked(&group->notification_lock); |
a1014f10 EP |
60 | |
61 | pr_debug("%s: group=%p count=%zd\n", __func__, group, count); | |
62 | ||
63 | if (fsnotify_notify_queue_is_empty(group)) | |
64 | return NULL; | |
65 | ||
66 | if (FAN_EVENT_METADATA_LEN > count) | |
67 | return ERR_PTR(-EINVAL); | |
68 | ||
c21dbe20 | 69 | /* held the notification_lock the whole time, so this is the |
a1014f10 | 70 | * same event we peeked above */ |
8ba8fa91 | 71 | return fsnotify_remove_first_event(group); |
a1014f10 EP |
72 | } |
73 | ||
352e3b24 | 74 | static int create_fd(struct fsnotify_group *group, |
7053aee2 JK |
75 | struct fanotify_event_info *event, |
76 | struct file **file) | |
a1014f10 EP |
77 | { |
78 | int client_fd; | |
a1014f10 EP |
79 | struct file *new_file; |
80 | ||
22aa425d | 81 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); |
a1014f10 | 82 | |
0b37e097 | 83 | client_fd = get_unused_fd_flags(group->fanotify_data.f_flags); |
a1014f10 EP |
84 | if (client_fd < 0) |
85 | return client_fd; | |
86 | ||
a1014f10 EP |
87 | /* |
88 | * we need a new file handle for the userspace program so it can read even if it was | |
89 | * originally opened O_WRONLY. | |
90 | */ | |
a1014f10 EP |
91 | /* it's possible this event was an overflow event. in that case dentry and mnt |
92 | * are NULL; That's fine, just don't call dentry open */ | |
765927b2 AV |
93 | if (event->path.dentry && event->path.mnt) |
94 | new_file = dentry_open(&event->path, | |
80af2588 | 95 | group->fanotify_data.f_flags | FMODE_NONOTIFY, |
a1014f10 EP |
96 | current_cred()); |
97 | else | |
98 | new_file = ERR_PTR(-EOVERFLOW); | |
99 | if (IS_ERR(new_file)) { | |
100 | /* | |
101 | * we still send an event even if we can't open the file. this | |
102 | * can happen when say tasks are gone and we try to open their | |
103 | * /proc files or we try to open a WRONLY file like in sysfs | |
104 | * we just send the errno to userspace since there isn't much | |
105 | * else we can do. | |
106 | */ | |
107 | put_unused_fd(client_fd); | |
108 | client_fd = PTR_ERR(new_file); | |
109 | } else { | |
352e3b24 | 110 | *file = new_file; |
a1014f10 EP |
111 | } |
112 | ||
22aa425d | 113 | return client_fd; |
a1014f10 EP |
114 | } |
115 | ||
ecf6f5e7 | 116 | static int fill_event_metadata(struct fsnotify_group *group, |
7053aee2 JK |
117 | struct fanotify_event_metadata *metadata, |
118 | struct fsnotify_event *fsn_event, | |
119 | struct file **file) | |
a1014f10 | 120 | { |
fdbf3cee | 121 | int ret = 0; |
7053aee2 | 122 | struct fanotify_event_info *event; |
fdbf3cee | 123 | |
a1014f10 | 124 | pr_debug("%s: group=%p metadata=%p event=%p\n", __func__, |
7053aee2 | 125 | group, metadata, fsn_event); |
a1014f10 | 126 | |
352e3b24 | 127 | *file = NULL; |
7053aee2 | 128 | event = container_of(fsn_event, struct fanotify_event_info, fse); |
a1014f10 | 129 | metadata->event_len = FAN_EVENT_METADATA_LEN; |
7d131623 | 130 | metadata->metadata_len = FAN_EVENT_METADATA_LEN; |
a1014f10 | 131 | metadata->vers = FANOTIFY_METADATA_VERSION; |
de1e0c40 | 132 | metadata->reserved = 0; |
7053aee2 | 133 | metadata->mask = fsn_event->mask & FAN_ALL_OUTGOING_EVENTS; |
32c32632 | 134 | metadata->pid = pid_vnr(event->tgid); |
7053aee2 | 135 | if (unlikely(fsn_event->mask & FAN_Q_OVERFLOW)) |
fdbf3cee LS |
136 | metadata->fd = FAN_NOFD; |
137 | else { | |
352e3b24 | 138 | metadata->fd = create_fd(group, event, file); |
fdbf3cee LS |
139 | if (metadata->fd < 0) |
140 | ret = metadata->fd; | |
141 | } | |
a1014f10 | 142 | |
fdbf3cee | 143 | return ret; |
a1014f10 EP |
144 | } |
145 | ||
f083441b JK |
146 | static struct fanotify_perm_event_info *dequeue_event( |
147 | struct fsnotify_group *group, int fd) | |
b2d87909 | 148 | { |
f083441b | 149 | struct fanotify_perm_event_info *event, *return_e = NULL; |
b2d87909 | 150 | |
073f6552 | 151 | spin_lock(&group->notification_lock); |
f083441b JK |
152 | list_for_each_entry(event, &group->fanotify_data.access_list, |
153 | fae.fse.list) { | |
154 | if (event->fd != fd) | |
b2d87909 EP |
155 | continue; |
156 | ||
f083441b JK |
157 | list_del_init(&event->fae.fse.list); |
158 | return_e = event; | |
b2d87909 EP |
159 | break; |
160 | } | |
073f6552 | 161 | spin_unlock(&group->notification_lock); |
b2d87909 | 162 | |
f083441b | 163 | pr_debug("%s: found return_re=%p\n", __func__, return_e); |
b2d87909 | 164 | |
f083441b | 165 | return return_e; |
b2d87909 EP |
166 | } |
167 | ||
168 | static int process_access_response(struct fsnotify_group *group, | |
169 | struct fanotify_response *response_struct) | |
170 | { | |
f083441b JK |
171 | struct fanotify_perm_event_info *event; |
172 | int fd = response_struct->fd; | |
173 | int response = response_struct->response; | |
b2d87909 EP |
174 | |
175 | pr_debug("%s: group=%p fd=%d response=%d\n", __func__, group, | |
176 | fd, response); | |
177 | /* | |
178 | * make sure the response is valid, if invalid we do nothing and either | |
25985edc | 179 | * userspace can send a valid response or we will clean it up after the |
b2d87909 EP |
180 | * timeout |
181 | */ | |
de8cd83e | 182 | switch (response & ~FAN_AUDIT) { |
b2d87909 EP |
183 | case FAN_ALLOW: |
184 | case FAN_DENY: | |
185 | break; | |
186 | default: | |
187 | return -EINVAL; | |
188 | } | |
189 | ||
190 | if (fd < 0) | |
191 | return -EINVAL; | |
192 | ||
de8cd83e SG |
193 | if ((response & FAN_AUDIT) && !group->fanotify_data.audit) |
194 | return -EINVAL; | |
195 | ||
f083441b JK |
196 | event = dequeue_event(group, fd); |
197 | if (!event) | |
b2d87909 EP |
198 | return -ENOENT; |
199 | ||
f083441b | 200 | event->response = response; |
b2d87909 EP |
201 | wake_up(&group->fanotify_data.access_waitq); |
202 | ||
b2d87909 EP |
203 | return 0; |
204 | } | |
b2d87909 | 205 | |
a1014f10 EP |
206 | static ssize_t copy_event_to_user(struct fsnotify_group *group, |
207 | struct fsnotify_event *event, | |
208 | char __user *buf) | |
209 | { | |
210 | struct fanotify_event_metadata fanotify_event_metadata; | |
352e3b24 | 211 | struct file *f; |
b2d87909 | 212 | int fd, ret; |
a1014f10 EP |
213 | |
214 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); | |
215 | ||
352e3b24 | 216 | ret = fill_event_metadata(group, &fanotify_event_metadata, event, &f); |
ecf6f5e7 | 217 | if (ret < 0) |
d507816b | 218 | return ret; |
b2d87909 | 219 | |
fdbf3cee | 220 | fd = fanotify_event_metadata.fd; |
b2d87909 | 221 | ret = -EFAULT; |
7d131623 EP |
222 | if (copy_to_user(buf, &fanotify_event_metadata, |
223 | fanotify_event_metadata.event_len)) | |
352e3b24 AV |
224 | goto out_close_fd; |
225 | ||
6685df31 | 226 | if (fanotify_is_perm_event(event->mask)) |
d507816b | 227 | FANOTIFY_PE(event)->fd = fd; |
a1014f10 | 228 | |
3587b1b0 AV |
229 | if (fd != FAN_NOFD) |
230 | fd_install(fd, f); | |
7d131623 | 231 | return fanotify_event_metadata.event_len; |
b2d87909 | 232 | |
b2d87909 | 233 | out_close_fd: |
352e3b24 AV |
234 | if (fd != FAN_NOFD) { |
235 | put_unused_fd(fd); | |
236 | fput(f); | |
237 | } | |
b2d87909 | 238 | return ret; |
a1014f10 EP |
239 | } |
240 | ||
241 | /* intofiy userspace file descriptor functions */ | |
076ccb76 | 242 | static __poll_t fanotify_poll(struct file *file, poll_table *wait) |
a1014f10 EP |
243 | { |
244 | struct fsnotify_group *group = file->private_data; | |
076ccb76 | 245 | __poll_t ret = 0; |
a1014f10 EP |
246 | |
247 | poll_wait(file, &group->notification_waitq, wait); | |
c21dbe20 | 248 | spin_lock(&group->notification_lock); |
a1014f10 EP |
249 | if (!fsnotify_notify_queue_is_empty(group)) |
250 | ret = POLLIN | POLLRDNORM; | |
c21dbe20 | 251 | spin_unlock(&group->notification_lock); |
a1014f10 EP |
252 | |
253 | return ret; | |
254 | } | |
255 | ||
256 | static ssize_t fanotify_read(struct file *file, char __user *buf, | |
257 | size_t count, loff_t *pos) | |
258 | { | |
259 | struct fsnotify_group *group; | |
260 | struct fsnotify_event *kevent; | |
261 | char __user *start; | |
262 | int ret; | |
536ebe9c | 263 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
a1014f10 EP |
264 | |
265 | start = buf; | |
266 | group = file->private_data; | |
267 | ||
268 | pr_debug("%s: group=%p\n", __func__, group); | |
269 | ||
536ebe9c | 270 | add_wait_queue(&group->notification_waitq, &wait); |
a1014f10 | 271 | while (1) { |
c21dbe20 | 272 | spin_lock(&group->notification_lock); |
a1014f10 | 273 | kevent = get_one_event(group, count); |
c21dbe20 | 274 | spin_unlock(&group->notification_lock); |
a1014f10 | 275 | |
d8aaab4f | 276 | if (IS_ERR(kevent)) { |
a1014f10 | 277 | ret = PTR_ERR(kevent); |
d8aaab4f JK |
278 | break; |
279 | } | |
280 | ||
281 | if (!kevent) { | |
282 | ret = -EAGAIN; | |
283 | if (file->f_flags & O_NONBLOCK) | |
a1014f10 | 284 | break; |
d8aaab4f JK |
285 | |
286 | ret = -ERESTARTSYS; | |
287 | if (signal_pending(current)) | |
288 | break; | |
289 | ||
290 | if (start != buf) | |
a1014f10 | 291 | break; |
536ebe9c PZ |
292 | |
293 | wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
a1014f10 EP |
294 | continue; |
295 | } | |
296 | ||
d8aaab4f | 297 | ret = copy_event_to_user(group, kevent, buf); |
4ff33aaf AG |
298 | if (unlikely(ret == -EOPENSTALE)) { |
299 | /* | |
300 | * We cannot report events with stale fd so drop it. | |
301 | * Setting ret to 0 will continue the event loop and | |
302 | * do the right thing if there are no more events to | |
303 | * read (i.e. return bytes read, -EAGAIN or wait). | |
304 | */ | |
305 | ret = 0; | |
306 | } | |
307 | ||
d8aaab4f JK |
308 | /* |
309 | * Permission events get queued to wait for response. Other | |
310 | * events can be destroyed now. | |
311 | */ | |
6685df31 | 312 | if (!fanotify_is_perm_event(kevent->mask)) { |
d8aaab4f | 313 | fsnotify_destroy_event(group, kevent); |
d507816b | 314 | } else { |
4ff33aaf | 315 | if (ret <= 0) { |
d507816b JK |
316 | FANOTIFY_PE(kevent)->response = FAN_DENY; |
317 | wake_up(&group->fanotify_data.access_waitq); | |
4ff33aaf AG |
318 | } else { |
319 | spin_lock(&group->notification_lock); | |
320 | list_add_tail(&kevent->list, | |
321 | &group->fanotify_data.access_list); | |
322 | spin_unlock(&group->notification_lock); | |
d507816b | 323 | } |
d507816b | 324 | } |
4ff33aaf AG |
325 | if (ret < 0) |
326 | break; | |
d8aaab4f JK |
327 | buf += ret; |
328 | count -= ret; | |
a1014f10 | 329 | } |
536ebe9c | 330 | remove_wait_queue(&group->notification_waitq, &wait); |
a1014f10 | 331 | |
a1014f10 EP |
332 | if (start != buf && ret != -EFAULT) |
333 | ret = buf - start; | |
334 | return ret; | |
335 | } | |
336 | ||
b2d87909 EP |
337 | static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) |
338 | { | |
b2d87909 EP |
339 | struct fanotify_response response = { .fd = -1, .response = -1 }; |
340 | struct fsnotify_group *group; | |
341 | int ret; | |
342 | ||
6685df31 MS |
343 | if (!IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) |
344 | return -EINVAL; | |
345 | ||
b2d87909 EP |
346 | group = file->private_data; |
347 | ||
348 | if (count > sizeof(response)) | |
349 | count = sizeof(response); | |
350 | ||
351 | pr_debug("%s: group=%p count=%zu\n", __func__, group, count); | |
352 | ||
353 | if (copy_from_user(&response, buf, count)) | |
354 | return -EFAULT; | |
355 | ||
356 | ret = process_access_response(group, &response); | |
357 | if (ret < 0) | |
358 | count = ret; | |
359 | ||
360 | return count; | |
b2d87909 EP |
361 | } |
362 | ||
52c923dd EP |
363 | static int fanotify_release(struct inode *ignored, struct file *file) |
364 | { | |
365 | struct fsnotify_group *group = file->private_data; | |
f083441b | 366 | struct fanotify_perm_event_info *event, *next; |
96d41019 | 367 | struct fsnotify_event *fsn_event; |
19ba54f4 | 368 | |
5838d444 | 369 | /* |
96d41019 JK |
370 | * Stop new events from arriving in the notification queue. since |
371 | * userspace cannot use fanotify fd anymore, no event can enter or | |
372 | * leave access_list by now either. | |
5838d444 | 373 | */ |
96d41019 | 374 | fsnotify_group_stop_queueing(group); |
2eebf582 | 375 | |
96d41019 JK |
376 | /* |
377 | * Process all permission events on access_list and notification queue | |
378 | * and simulate reply from userspace. | |
379 | */ | |
073f6552 | 380 | spin_lock(&group->notification_lock); |
f083441b JK |
381 | list_for_each_entry_safe(event, next, &group->fanotify_data.access_list, |
382 | fae.fse.list) { | |
383 | pr_debug("%s: found group=%p event=%p\n", __func__, group, | |
384 | event); | |
2eebf582 | 385 | |
f083441b JK |
386 | list_del_init(&event->fae.fse.list); |
387 | event->response = FAN_ALLOW; | |
2eebf582 | 388 | } |
2eebf582 | 389 | |
5838d444 | 390 | /* |
96d41019 JK |
391 | * Destroy all non-permission events. For permission events just |
392 | * dequeue them and set the response. They will be freed once the | |
393 | * response is consumed and fanotify_get_response() returns. | |
5838d444 | 394 | */ |
96d41019 JK |
395 | while (!fsnotify_notify_queue_is_empty(group)) { |
396 | fsn_event = fsnotify_remove_first_event(group); | |
1404ff3c | 397 | if (!(fsn_event->mask & FAN_ALL_PERM_EVENTS)) { |
c21dbe20 | 398 | spin_unlock(&group->notification_lock); |
96d41019 | 399 | fsnotify_destroy_event(group, fsn_event); |
c21dbe20 | 400 | spin_lock(&group->notification_lock); |
6685df31 | 401 | } else { |
96d41019 | 402 | FANOTIFY_PE(fsn_event)->response = FAN_ALLOW; |
6685df31 | 403 | } |
96d41019 | 404 | } |
c21dbe20 | 405 | spin_unlock(&group->notification_lock); |
96d41019 JK |
406 | |
407 | /* Response for all permission events it set, wakeup waiters */ | |
2eebf582 | 408 | wake_up(&group->fanotify_data.access_waitq); |
0a6b6bd5 | 409 | |
52c923dd | 410 | /* matches the fanotify_init->fsnotify_alloc_group */ |
d8153d4d | 411 | fsnotify_destroy_group(group); |
52c923dd EP |
412 | |
413 | return 0; | |
414 | } | |
415 | ||
a1014f10 EP |
416 | static long fanotify_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
417 | { | |
418 | struct fsnotify_group *group; | |
7053aee2 | 419 | struct fsnotify_event *fsn_event; |
a1014f10 EP |
420 | void __user *p; |
421 | int ret = -ENOTTY; | |
422 | size_t send_len = 0; | |
423 | ||
424 | group = file->private_data; | |
425 | ||
426 | p = (void __user *) arg; | |
427 | ||
428 | switch (cmd) { | |
429 | case FIONREAD: | |
c21dbe20 | 430 | spin_lock(&group->notification_lock); |
7053aee2 | 431 | list_for_each_entry(fsn_event, &group->notification_list, list) |
a1014f10 | 432 | send_len += FAN_EVENT_METADATA_LEN; |
c21dbe20 | 433 | spin_unlock(&group->notification_lock); |
a1014f10 EP |
434 | ret = put_user(send_len, (int __user *) p); |
435 | break; | |
436 | } | |
437 | ||
438 | return ret; | |
439 | } | |
440 | ||
52c923dd | 441 | static const struct file_operations fanotify_fops = { |
be77196b | 442 | .show_fdinfo = fanotify_show_fdinfo, |
a1014f10 EP |
443 | .poll = fanotify_poll, |
444 | .read = fanotify_read, | |
b2d87909 | 445 | .write = fanotify_write, |
52c923dd EP |
446 | .fasync = NULL, |
447 | .release = fanotify_release, | |
a1014f10 EP |
448 | .unlocked_ioctl = fanotify_ioctl, |
449 | .compat_ioctl = fanotify_ioctl, | |
6038f373 | 450 | .llseek = noop_llseek, |
52c923dd EP |
451 | }; |
452 | ||
2a3edf86 EP |
453 | static int fanotify_find_path(int dfd, const char __user *filename, |
454 | struct path *path, unsigned int flags) | |
455 | { | |
456 | int ret; | |
457 | ||
458 | pr_debug("%s: dfd=%d filename=%p flags=%x\n", __func__, | |
459 | dfd, filename, flags); | |
460 | ||
461 | if (filename == NULL) { | |
2903ff01 | 462 | struct fd f = fdget(dfd); |
2a3edf86 EP |
463 | |
464 | ret = -EBADF; | |
2903ff01 | 465 | if (!f.file) |
2a3edf86 EP |
466 | goto out; |
467 | ||
468 | ret = -ENOTDIR; | |
469 | if ((flags & FAN_MARK_ONLYDIR) && | |
496ad9aa | 470 | !(S_ISDIR(file_inode(f.file)->i_mode))) { |
2903ff01 | 471 | fdput(f); |
2a3edf86 EP |
472 | goto out; |
473 | } | |
474 | ||
2903ff01 | 475 | *path = f.file->f_path; |
2a3edf86 | 476 | path_get(path); |
2903ff01 | 477 | fdput(f); |
2a3edf86 EP |
478 | } else { |
479 | unsigned int lookup_flags = 0; | |
480 | ||
481 | if (!(flags & FAN_MARK_DONT_FOLLOW)) | |
482 | lookup_flags |= LOOKUP_FOLLOW; | |
483 | if (flags & FAN_MARK_ONLYDIR) | |
484 | lookup_flags |= LOOKUP_DIRECTORY; | |
485 | ||
486 | ret = user_path_at(dfd, filename, lookup_flags, path); | |
487 | if (ret) | |
488 | goto out; | |
489 | } | |
490 | ||
491 | /* you can only watch an inode if you have read permissions on it */ | |
492 | ret = inode_permission(path->dentry->d_inode, MAY_READ); | |
493 | if (ret) | |
494 | path_put(path); | |
495 | out: | |
496 | return ret; | |
497 | } | |
498 | ||
b9e4e3bd EP |
499 | static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark, |
500 | __u32 mask, | |
6dfbd149 LS |
501 | unsigned int flags, |
502 | int *destroy) | |
088b09b0 | 503 | { |
d2c1874c | 504 | __u32 oldmask = 0; |
088b09b0 AG |
505 | |
506 | spin_lock(&fsn_mark->lock); | |
b9e4e3bd | 507 | if (!(flags & FAN_MARK_IGNORED_MASK)) { |
66ba93c0 LS |
508 | __u32 tmask = fsn_mark->mask & ~mask; |
509 | ||
510 | if (flags & FAN_MARK_ONDIR) | |
511 | tmask &= ~FAN_ONDIR; | |
512 | ||
b9e4e3bd | 513 | oldmask = fsn_mark->mask; |
66d2b81b | 514 | fsn_mark->mask = tmask; |
b9e4e3bd | 515 | } else { |
d2c1874c | 516 | __u32 tmask = fsn_mark->ignored_mask & ~mask; |
66ba93c0 LS |
517 | if (flags & FAN_MARK_ONDIR) |
518 | tmask &= ~FAN_ONDIR; | |
66d2b81b | 519 | fsn_mark->ignored_mask = tmask; |
b9e4e3bd | 520 | } |
a118449a | 521 | *destroy = !(fsn_mark->mask | fsn_mark->ignored_mask); |
088b09b0 AG |
522 | spin_unlock(&fsn_mark->lock); |
523 | ||
088b09b0 AG |
524 | return mask & oldmask; |
525 | } | |
526 | ||
f3640192 | 527 | static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
528 | struct vfsmount *mnt, __u32 mask, |
529 | unsigned int flags) | |
88826276 EP |
530 | { |
531 | struct fsnotify_mark *fsn_mark = NULL; | |
088b09b0 | 532 | __u32 removed; |
6dfbd149 | 533 | int destroy_mark; |
88826276 | 534 | |
7b18527c | 535 | mutex_lock(&group->mark_mutex); |
b1362edf JK |
536 | fsn_mark = fsnotify_find_mark(&real_mount(mnt)->mnt_fsnotify_marks, |
537 | group); | |
7b18527c LS |
538 | if (!fsn_mark) { |
539 | mutex_unlock(&group->mark_mutex); | |
f3640192 | 540 | return -ENOENT; |
7b18527c | 541 | } |
88826276 | 542 | |
6dfbd149 LS |
543 | removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags, |
544 | &destroy_mark); | |
c9747640 | 545 | if (removed & real_mount(mnt)->mnt_fsnotify_mask) |
8920d273 | 546 | fsnotify_recalc_mask(real_mount(mnt)->mnt_fsnotify_marks); |
6dfbd149 | 547 | if (destroy_mark) |
4712e722 | 548 | fsnotify_detach_mark(fsn_mark); |
7b18527c | 549 | mutex_unlock(&group->mark_mutex); |
4712e722 JK |
550 | if (destroy_mark) |
551 | fsnotify_free_mark(fsn_mark); | |
6dfbd149 | 552 | |
f3640192 | 553 | fsnotify_put_mark(fsn_mark); |
f3640192 AG |
554 | return 0; |
555 | } | |
2a3edf86 | 556 | |
f3640192 | 557 | static int fanotify_remove_inode_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
558 | struct inode *inode, __u32 mask, |
559 | unsigned int flags) | |
f3640192 AG |
560 | { |
561 | struct fsnotify_mark *fsn_mark = NULL; | |
562 | __u32 removed; | |
6dfbd149 | 563 | int destroy_mark; |
f3640192 | 564 | |
7b18527c | 565 | mutex_lock(&group->mark_mutex); |
b1362edf | 566 | fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group); |
7b18527c LS |
567 | if (!fsn_mark) { |
568 | mutex_unlock(&group->mark_mutex); | |
88826276 | 569 | return -ENOENT; |
7b18527c | 570 | } |
88826276 | 571 | |
6dfbd149 LS |
572 | removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags, |
573 | &destroy_mark); | |
c9747640 | 574 | if (removed & inode->i_fsnotify_mask) |
8920d273 | 575 | fsnotify_recalc_mask(inode->i_fsnotify_marks); |
6dfbd149 | 576 | if (destroy_mark) |
4712e722 | 577 | fsnotify_detach_mark(fsn_mark); |
7b18527c | 578 | mutex_unlock(&group->mark_mutex); |
4712e722 JK |
579 | if (destroy_mark) |
580 | fsnotify_free_mark(fsn_mark); | |
7b18527c | 581 | |
b1362edf | 582 | /* matches the fsnotify_find_mark() */ |
2a3edf86 | 583 | fsnotify_put_mark(fsn_mark); |
088b09b0 | 584 | |
2a3edf86 EP |
585 | return 0; |
586 | } | |
587 | ||
b9e4e3bd EP |
588 | static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark, |
589 | __u32 mask, | |
590 | unsigned int flags) | |
912ee394 | 591 | { |
192ca4d1 | 592 | __u32 oldmask = -1; |
912ee394 AG |
593 | |
594 | spin_lock(&fsn_mark->lock); | |
b9e4e3bd | 595 | if (!(flags & FAN_MARK_IGNORED_MASK)) { |
66ba93c0 LS |
596 | __u32 tmask = fsn_mark->mask | mask; |
597 | ||
598 | if (flags & FAN_MARK_ONDIR) | |
599 | tmask |= FAN_ONDIR; | |
600 | ||
b9e4e3bd | 601 | oldmask = fsn_mark->mask; |
66d2b81b | 602 | fsn_mark->mask = tmask; |
b9e4e3bd | 603 | } else { |
192ca4d1 | 604 | __u32 tmask = fsn_mark->ignored_mask | mask; |
66ba93c0 LS |
605 | if (flags & FAN_MARK_ONDIR) |
606 | tmask |= FAN_ONDIR; | |
607 | ||
66d2b81b | 608 | fsn_mark->ignored_mask = tmask; |
c9778a98 EP |
609 | if (flags & FAN_MARK_IGNORED_SURV_MODIFY) |
610 | fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY; | |
b9e4e3bd | 611 | } |
912ee394 AG |
612 | spin_unlock(&fsn_mark->lock); |
613 | ||
614 | return mask & ~oldmask; | |
615 | } | |
616 | ||
5e9c070c LS |
617 | static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group, |
618 | struct inode *inode, | |
619 | struct vfsmount *mnt) | |
620 | { | |
621 | struct fsnotify_mark *mark; | |
622 | int ret; | |
623 | ||
624 | if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks) | |
625 | return ERR_PTR(-ENOSPC); | |
626 | ||
627 | mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL); | |
628 | if (!mark) | |
629 | return ERR_PTR(-ENOMEM); | |
630 | ||
054c636e | 631 | fsnotify_init_mark(mark, group); |
7b129323 | 632 | ret = fsnotify_add_mark_locked(mark, inode, mnt, 0); |
5e9c070c LS |
633 | if (ret) { |
634 | fsnotify_put_mark(mark); | |
635 | return ERR_PTR(ret); | |
636 | } | |
637 | ||
638 | return mark; | |
639 | } | |
640 | ||
641 | ||
52202dfb | 642 | static int fanotify_add_vfsmount_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
643 | struct vfsmount *mnt, __u32 mask, |
644 | unsigned int flags) | |
2a3edf86 EP |
645 | { |
646 | struct fsnotify_mark *fsn_mark; | |
912ee394 | 647 | __u32 added; |
2a3edf86 | 648 | |
7b18527c | 649 | mutex_lock(&group->mark_mutex); |
b1362edf JK |
650 | fsn_mark = fsnotify_find_mark(&real_mount(mnt)->mnt_fsnotify_marks, |
651 | group); | |
88826276 | 652 | if (!fsn_mark) { |
5e9c070c LS |
653 | fsn_mark = fanotify_add_new_mark(group, NULL, mnt); |
654 | if (IS_ERR(fsn_mark)) { | |
7b18527c | 655 | mutex_unlock(&group->mark_mutex); |
5e9c070c | 656 | return PTR_ERR(fsn_mark); |
7b18527c | 657 | } |
88826276 | 658 | } |
b9e4e3bd | 659 | added = fanotify_mark_add_to_mask(fsn_mark, mask, flags); |
c63181e6 | 660 | if (added & ~real_mount(mnt)->mnt_fsnotify_mask) |
8920d273 | 661 | fsnotify_recalc_mask(real_mount(mnt)->mnt_fsnotify_marks); |
c9747640 | 662 | mutex_unlock(&group->mark_mutex); |
5e9c070c | 663 | |
fa218ab9 | 664 | fsnotify_put_mark(fsn_mark); |
5e9c070c | 665 | return 0; |
88826276 EP |
666 | } |
667 | ||
52202dfb | 668 | static int fanotify_add_inode_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
669 | struct inode *inode, __u32 mask, |
670 | unsigned int flags) | |
88826276 EP |
671 | { |
672 | struct fsnotify_mark *fsn_mark; | |
912ee394 | 673 | __u32 added; |
88826276 EP |
674 | |
675 | pr_debug("%s: group=%p inode=%p\n", __func__, group, inode); | |
2a3edf86 | 676 | |
5322a59f EP |
677 | /* |
678 | * If some other task has this inode open for write we should not add | |
679 | * an ignored mark, unless that ignored mark is supposed to survive | |
680 | * modification changes anyway. | |
681 | */ | |
682 | if ((flags & FAN_MARK_IGNORED_MASK) && | |
683 | !(flags & FAN_MARK_IGNORED_SURV_MODIFY) && | |
684 | (atomic_read(&inode->i_writecount) > 0)) | |
685 | return 0; | |
686 | ||
7b18527c | 687 | mutex_lock(&group->mark_mutex); |
b1362edf | 688 | fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group); |
2a3edf86 | 689 | if (!fsn_mark) { |
5e9c070c LS |
690 | fsn_mark = fanotify_add_new_mark(group, inode, NULL); |
691 | if (IS_ERR(fsn_mark)) { | |
7b18527c | 692 | mutex_unlock(&group->mark_mutex); |
5e9c070c | 693 | return PTR_ERR(fsn_mark); |
7b18527c | 694 | } |
2a3edf86 | 695 | } |
b9e4e3bd | 696 | added = fanotify_mark_add_to_mask(fsn_mark, mask, flags); |
43709a28 | 697 | if (added & ~inode->i_fsnotify_mask) |
8920d273 | 698 | fsnotify_recalc_mask(inode->i_fsnotify_marks); |
c9747640 | 699 | mutex_unlock(&group->mark_mutex); |
5e9c070c | 700 | |
fa218ab9 | 701 | fsnotify_put_mark(fsn_mark); |
5e9c070c | 702 | return 0; |
88826276 | 703 | } |
2a3edf86 | 704 | |
52c923dd | 705 | /* fanotify syscalls */ |
08ae8938 | 706 | SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags) |
11637e4b | 707 | { |
52c923dd EP |
708 | struct fsnotify_group *group; |
709 | int f_flags, fd; | |
4afeff85 | 710 | struct user_struct *user; |
ff57cd58 | 711 | struct fanotify_event_info *oevent; |
52c923dd | 712 | |
08ae8938 EP |
713 | pr_debug("%s: flags=%d event_f_flags=%d\n", |
714 | __func__, flags, event_f_flags); | |
52c923dd | 715 | |
52c923dd | 716 | if (!capable(CAP_SYS_ADMIN)) |
a2f13ad0 | 717 | return -EPERM; |
52c923dd | 718 | |
de8cd83e SG |
719 | #ifdef CONFIG_AUDITSYSCALL |
720 | if (flags & ~(FAN_ALL_INIT_FLAGS | FAN_ENABLE_AUDIT)) | |
721 | #else | |
52c923dd | 722 | if (flags & ~FAN_ALL_INIT_FLAGS) |
de8cd83e | 723 | #endif |
52c923dd EP |
724 | return -EINVAL; |
725 | ||
48149e9d HS |
726 | if (event_f_flags & ~FANOTIFY_INIT_ALL_EVENT_F_BITS) |
727 | return -EINVAL; | |
728 | ||
729 | switch (event_f_flags & O_ACCMODE) { | |
730 | case O_RDONLY: | |
731 | case O_RDWR: | |
732 | case O_WRONLY: | |
733 | break; | |
734 | default: | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
4afeff85 EP |
738 | user = get_current_user(); |
739 | if (atomic_read(&user->fanotify_listeners) > FANOTIFY_DEFAULT_MAX_LISTENERS) { | |
740 | free_uid(user); | |
741 | return -EMFILE; | |
742 | } | |
743 | ||
b2d87909 | 744 | f_flags = O_RDWR | FMODE_NONOTIFY; |
52c923dd EP |
745 | if (flags & FAN_CLOEXEC) |
746 | f_flags |= O_CLOEXEC; | |
747 | if (flags & FAN_NONBLOCK) | |
748 | f_flags |= O_NONBLOCK; | |
749 | ||
750 | /* fsnotify_alloc_group takes a ref. Dropped in fanotify_release */ | |
751 | group = fsnotify_alloc_group(&fanotify_fsnotify_ops); | |
26379198 EP |
752 | if (IS_ERR(group)) { |
753 | free_uid(user); | |
52c923dd | 754 | return PTR_ERR(group); |
26379198 | 755 | } |
52c923dd | 756 | |
4afeff85 EP |
757 | group->fanotify_data.user = user; |
758 | atomic_inc(&user->fanotify_listeners); | |
759 | ||
f083441b | 760 | oevent = fanotify_alloc_event(NULL, FS_Q_OVERFLOW, NULL); |
ff57cd58 JK |
761 | if (unlikely(!oevent)) { |
762 | fd = -ENOMEM; | |
763 | goto out_destroy_group; | |
764 | } | |
765 | group->overflow_event = &oevent->fse; | |
ff57cd58 | 766 | |
1e2ee49f WW |
767 | if (force_o_largefile()) |
768 | event_f_flags |= O_LARGEFILE; | |
80af2588 | 769 | group->fanotify_data.f_flags = event_f_flags; |
9e66e423 EP |
770 | init_waitqueue_head(&group->fanotify_data.access_waitq); |
771 | INIT_LIST_HEAD(&group->fanotify_data.access_list); | |
4231a235 EP |
772 | switch (flags & FAN_ALL_CLASS_BITS) { |
773 | case FAN_CLASS_NOTIF: | |
774 | group->priority = FS_PRIO_0; | |
775 | break; | |
776 | case FAN_CLASS_CONTENT: | |
777 | group->priority = FS_PRIO_1; | |
778 | break; | |
779 | case FAN_CLASS_PRE_CONTENT: | |
780 | group->priority = FS_PRIO_2; | |
781 | break; | |
782 | default: | |
783 | fd = -EINVAL; | |
d8153d4d | 784 | goto out_destroy_group; |
4231a235 | 785 | } |
cb2d429f | 786 | |
5dd03f55 EP |
787 | if (flags & FAN_UNLIMITED_QUEUE) { |
788 | fd = -EPERM; | |
789 | if (!capable(CAP_SYS_ADMIN)) | |
d8153d4d | 790 | goto out_destroy_group; |
5dd03f55 EP |
791 | group->max_events = UINT_MAX; |
792 | } else { | |
793 | group->max_events = FANOTIFY_DEFAULT_MAX_EVENTS; | |
794 | } | |
2529a0df | 795 | |
ac7e22dc EP |
796 | if (flags & FAN_UNLIMITED_MARKS) { |
797 | fd = -EPERM; | |
798 | if (!capable(CAP_SYS_ADMIN)) | |
d8153d4d | 799 | goto out_destroy_group; |
ac7e22dc EP |
800 | group->fanotify_data.max_marks = UINT_MAX; |
801 | } else { | |
802 | group->fanotify_data.max_marks = FANOTIFY_DEFAULT_MAX_MARKS; | |
803 | } | |
e7099d8a | 804 | |
de8cd83e SG |
805 | if (flags & FAN_ENABLE_AUDIT) { |
806 | fd = -EPERM; | |
807 | if (!capable(CAP_AUDIT_WRITE)) | |
808 | goto out_destroy_group; | |
809 | group->fanotify_data.audit = true; | |
810 | } | |
811 | ||
52c923dd EP |
812 | fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags); |
813 | if (fd < 0) | |
d8153d4d | 814 | goto out_destroy_group; |
52c923dd EP |
815 | |
816 | return fd; | |
817 | ||
d8153d4d LS |
818 | out_destroy_group: |
819 | fsnotify_destroy_group(group); | |
52c923dd | 820 | return fd; |
11637e4b | 821 | } |
bbaa4168 | 822 | |
4a0fd5bf AV |
823 | SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags, |
824 | __u64, mask, int, dfd, | |
825 | const char __user *, pathname) | |
bbaa4168 | 826 | { |
0ff21db9 EP |
827 | struct inode *inode = NULL; |
828 | struct vfsmount *mnt = NULL; | |
2a3edf86 | 829 | struct fsnotify_group *group; |
2903ff01 | 830 | struct fd f; |
2a3edf86 | 831 | struct path path; |
6685df31 | 832 | u32 valid_mask = FAN_ALL_EVENTS | FAN_EVENT_ON_CHILD; |
2903ff01 | 833 | int ret; |
2a3edf86 EP |
834 | |
835 | pr_debug("%s: fanotify_fd=%d flags=%x dfd=%d pathname=%p mask=%llx\n", | |
836 | __func__, fanotify_fd, flags, dfd, pathname, mask); | |
837 | ||
838 | /* we only use the lower 32 bits as of right now. */ | |
839 | if (mask & ((__u64)0xffffffff << 32)) | |
840 | return -EINVAL; | |
841 | ||
88380fe6 AG |
842 | if (flags & ~FAN_ALL_MARK_FLAGS) |
843 | return -EINVAL; | |
4d92604c | 844 | switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) { |
1734dee4 | 845 | case FAN_MARK_ADD: /* fallthrough */ |
88380fe6 | 846 | case FAN_MARK_REMOVE: |
1734dee4 LS |
847 | if (!mask) |
848 | return -EINVAL; | |
cc299a98 | 849 | break; |
4d92604c | 850 | case FAN_MARK_FLUSH: |
cc299a98 HS |
851 | if (flags & ~(FAN_MARK_MOUNT | FAN_MARK_FLUSH)) |
852 | return -EINVAL; | |
88380fe6 AG |
853 | break; |
854 | default: | |
855 | return -EINVAL; | |
856 | } | |
8fcd6528 EP |
857 | |
858 | if (mask & FAN_ONDIR) { | |
859 | flags |= FAN_MARK_ONDIR; | |
860 | mask &= ~FAN_ONDIR; | |
861 | } | |
862 | ||
6685df31 MS |
863 | if (IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) |
864 | valid_mask |= FAN_ALL_PERM_EVENTS; | |
865 | ||
866 | if (mask & ~valid_mask) | |
2a3edf86 EP |
867 | return -EINVAL; |
868 | ||
2903ff01 AV |
869 | f = fdget(fanotify_fd); |
870 | if (unlikely(!f.file)) | |
2a3edf86 EP |
871 | return -EBADF; |
872 | ||
873 | /* verify that this is indeed an fanotify instance */ | |
874 | ret = -EINVAL; | |
2903ff01 | 875 | if (unlikely(f.file->f_op != &fanotify_fops)) |
2a3edf86 | 876 | goto fput_and_out; |
2903ff01 | 877 | group = f.file->private_data; |
4231a235 EP |
878 | |
879 | /* | |
880 | * group->priority == FS_PRIO_0 == FAN_CLASS_NOTIF. These are not | |
881 | * allowed to set permissions events. | |
882 | */ | |
883 | ret = -EINVAL; | |
884 | if (mask & FAN_ALL_PERM_EVENTS && | |
885 | group->priority == FS_PRIO_0) | |
886 | goto fput_and_out; | |
2a3edf86 | 887 | |
0a8dd2db HS |
888 | if (flags & FAN_MARK_FLUSH) { |
889 | ret = 0; | |
890 | if (flags & FAN_MARK_MOUNT) | |
891 | fsnotify_clear_vfsmount_marks_by_group(group); | |
892 | else | |
893 | fsnotify_clear_inode_marks_by_group(group); | |
894 | goto fput_and_out; | |
895 | } | |
896 | ||
2a3edf86 EP |
897 | ret = fanotify_find_path(dfd, pathname, &path, flags); |
898 | if (ret) | |
899 | goto fput_and_out; | |
900 | ||
901 | /* inode held in place by reference to path; group by fget on fd */ | |
eac8e9e8 | 902 | if (!(flags & FAN_MARK_MOUNT)) |
0ff21db9 EP |
903 | inode = path.dentry->d_inode; |
904 | else | |
905 | mnt = path.mnt; | |
2a3edf86 EP |
906 | |
907 | /* create/update an inode mark */ | |
0a8dd2db | 908 | switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) { |
c6223f46 | 909 | case FAN_MARK_ADD: |
eac8e9e8 | 910 | if (flags & FAN_MARK_MOUNT) |
b9e4e3bd | 911 | ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags); |
0ff21db9 | 912 | else |
b9e4e3bd | 913 | ret = fanotify_add_inode_mark(group, inode, mask, flags); |
c6223f46 AG |
914 | break; |
915 | case FAN_MARK_REMOVE: | |
f3640192 | 916 | if (flags & FAN_MARK_MOUNT) |
b9e4e3bd | 917 | ret = fanotify_remove_vfsmount_mark(group, mnt, mask, flags); |
f3640192 | 918 | else |
b9e4e3bd | 919 | ret = fanotify_remove_inode_mark(group, inode, mask, flags); |
c6223f46 AG |
920 | break; |
921 | default: | |
922 | ret = -EINVAL; | |
923 | } | |
2a3edf86 EP |
924 | |
925 | path_put(&path); | |
926 | fput_and_out: | |
2903ff01 | 927 | fdput(f); |
2a3edf86 EP |
928 | return ret; |
929 | } | |
930 | ||
91c2e0bc AV |
931 | #ifdef CONFIG_COMPAT |
932 | COMPAT_SYSCALL_DEFINE6(fanotify_mark, | |
933 | int, fanotify_fd, unsigned int, flags, | |
934 | __u32, mask0, __u32, mask1, int, dfd, | |
935 | const char __user *, pathname) | |
936 | { | |
937 | return sys_fanotify_mark(fanotify_fd, flags, | |
938 | #ifdef __BIG_ENDIAN | |
91c2e0bc | 939 | ((__u64)mask0 << 32) | mask1, |
592f6b84 HC |
940 | #else |
941 | ((__u64)mask1 << 32) | mask0, | |
91c2e0bc AV |
942 | #endif |
943 | dfd, pathname); | |
944 | } | |
945 | #endif | |
946 | ||
2a3edf86 | 947 | /* |
ae0e47f0 | 948 | * fanotify_user_setup - Our initialization function. Note that we cannot return |
2a3edf86 EP |
949 | * error because we have compiled-in VFS hooks. So an (unlikely) failure here |
950 | * must result in panic(). | |
951 | */ | |
952 | static int __init fanotify_user_setup(void) | |
953 | { | |
954 | fanotify_mark_cache = KMEM_CACHE(fsnotify_mark, SLAB_PANIC); | |
7053aee2 | 955 | fanotify_event_cachep = KMEM_CACHE(fanotify_event_info, SLAB_PANIC); |
6685df31 MS |
956 | if (IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) { |
957 | fanotify_perm_event_cachep = | |
958 | KMEM_CACHE(fanotify_perm_event_info, SLAB_PANIC); | |
959 | } | |
2a3edf86 EP |
960 | |
961 | return 0; | |
bbaa4168 | 962 | } |
2a3edf86 | 963 | device_initcall(fanotify_user_setup); |