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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> |
d46eb14b | 19 | #include <linux/memcontrol.h> |
a1014f10 EP |
20 | |
21 | #include <asm/ioctls.h> | |
11637e4b | 22 | |
c63181e6 | 23 | #include "../../mount.h" |
be77196b | 24 | #include "../fdinfo.h" |
7053aee2 | 25 | #include "fanotify.h" |
c63181e6 | 26 | |
2529a0df | 27 | #define FANOTIFY_DEFAULT_MAX_EVENTS 16384 |
e7099d8a | 28 | #define FANOTIFY_DEFAULT_MAX_MARKS 8192 |
4afeff85 | 29 | #define FANOTIFY_DEFAULT_MAX_LISTENERS 128 |
2529a0df | 30 | |
48149e9d HS |
31 | /* |
32 | * All flags that may be specified in parameter event_f_flags of fanotify_init. | |
33 | * | |
34 | * Internal and external open flags are stored together in field f_flags of | |
35 | * struct file. Only external open flags shall be allowed in event_f_flags. | |
36 | * Internal flags like FMODE_NONOTIFY, FMODE_EXEC, FMODE_NOCMTIME shall be | |
37 | * excluded. | |
38 | */ | |
39 | #define FANOTIFY_INIT_ALL_EVENT_F_BITS ( \ | |
40 | O_ACCMODE | O_APPEND | O_NONBLOCK | \ | |
41 | __O_SYNC | O_DSYNC | O_CLOEXEC | \ | |
42 | O_LARGEFILE | O_NOATIME ) | |
43 | ||
33d3dfff | 44 | extern const struct fsnotify_ops fanotify_fsnotify_ops; |
11637e4b | 45 | |
054c636e | 46 | struct kmem_cache *fanotify_mark_cache __read_mostly; |
7053aee2 | 47 | struct kmem_cache *fanotify_event_cachep __read_mostly; |
f083441b | 48 | struct kmem_cache *fanotify_perm_event_cachep __read_mostly; |
2a3edf86 | 49 | |
a1014f10 EP |
50 | /* |
51 | * Get an fsnotify notification event if one exists and is small | |
52 | * enough to fit in "count". Return an error pointer if the count | |
53 | * is not large enough. | |
54 | * | |
c21dbe20 | 55 | * Called with the group->notification_lock held. |
a1014f10 EP |
56 | */ |
57 | static struct fsnotify_event *get_one_event(struct fsnotify_group *group, | |
58 | size_t count) | |
59 | { | |
ed272640 | 60 | assert_spin_locked(&group->notification_lock); |
a1014f10 EP |
61 | |
62 | pr_debug("%s: group=%p count=%zd\n", __func__, group, count); | |
63 | ||
64 | if (fsnotify_notify_queue_is_empty(group)) | |
65 | return NULL; | |
66 | ||
67 | if (FAN_EVENT_METADATA_LEN > count) | |
68 | return ERR_PTR(-EINVAL); | |
69 | ||
c21dbe20 | 70 | /* held the notification_lock the whole time, so this is the |
a1014f10 | 71 | * same event we peeked above */ |
8ba8fa91 | 72 | return fsnotify_remove_first_event(group); |
a1014f10 EP |
73 | } |
74 | ||
352e3b24 | 75 | static int create_fd(struct fsnotify_group *group, |
7053aee2 JK |
76 | struct fanotify_event_info *event, |
77 | struct file **file) | |
a1014f10 EP |
78 | { |
79 | int client_fd; | |
a1014f10 EP |
80 | struct file *new_file; |
81 | ||
22aa425d | 82 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); |
a1014f10 | 83 | |
0b37e097 | 84 | client_fd = get_unused_fd_flags(group->fanotify_data.f_flags); |
a1014f10 EP |
85 | if (client_fd < 0) |
86 | return client_fd; | |
87 | ||
a1014f10 EP |
88 | /* |
89 | * we need a new file handle for the userspace program so it can read even if it was | |
90 | * originally opened O_WRONLY. | |
91 | */ | |
a1014f10 EP |
92 | /* it's possible this event was an overflow event. in that case dentry and mnt |
93 | * are NULL; That's fine, just don't call dentry open */ | |
765927b2 AV |
94 | if (event->path.dentry && event->path.mnt) |
95 | new_file = dentry_open(&event->path, | |
80af2588 | 96 | group->fanotify_data.f_flags | FMODE_NONOTIFY, |
a1014f10 EP |
97 | current_cred()); |
98 | else | |
99 | new_file = ERR_PTR(-EOVERFLOW); | |
100 | if (IS_ERR(new_file)) { | |
101 | /* | |
102 | * we still send an event even if we can't open the file. this | |
103 | * can happen when say tasks are gone and we try to open their | |
104 | * /proc files or we try to open a WRONLY file like in sysfs | |
105 | * we just send the errno to userspace since there isn't much | |
106 | * else we can do. | |
107 | */ | |
108 | put_unused_fd(client_fd); | |
109 | client_fd = PTR_ERR(new_file); | |
110 | } else { | |
352e3b24 | 111 | *file = new_file; |
a1014f10 EP |
112 | } |
113 | ||
22aa425d | 114 | return client_fd; |
a1014f10 EP |
115 | } |
116 | ||
ecf6f5e7 | 117 | static int fill_event_metadata(struct fsnotify_group *group, |
7053aee2 JK |
118 | struct fanotify_event_metadata *metadata, |
119 | struct fsnotify_event *fsn_event, | |
120 | struct file **file) | |
a1014f10 | 121 | { |
fdbf3cee | 122 | int ret = 0; |
7053aee2 | 123 | struct fanotify_event_info *event; |
fdbf3cee | 124 | |
a1014f10 | 125 | pr_debug("%s: group=%p metadata=%p event=%p\n", __func__, |
7053aee2 | 126 | group, metadata, fsn_event); |
a1014f10 | 127 | |
352e3b24 | 128 | *file = NULL; |
7053aee2 | 129 | event = container_of(fsn_event, struct fanotify_event_info, fse); |
a1014f10 | 130 | metadata->event_len = FAN_EVENT_METADATA_LEN; |
7d131623 | 131 | metadata->metadata_len = FAN_EVENT_METADATA_LEN; |
a1014f10 | 132 | metadata->vers = FANOTIFY_METADATA_VERSION; |
de1e0c40 | 133 | metadata->reserved = 0; |
23c9deeb | 134 | metadata->mask = fsn_event->mask & FANOTIFY_OUTGOING_EVENTS; |
d0a6a87e | 135 | metadata->pid = pid_vnr(event->pid); |
7053aee2 | 136 | if (unlikely(fsn_event->mask & FAN_Q_OVERFLOW)) |
fdbf3cee LS |
137 | metadata->fd = FAN_NOFD; |
138 | else { | |
352e3b24 | 139 | metadata->fd = create_fd(group, event, file); |
fdbf3cee LS |
140 | if (metadata->fd < 0) |
141 | ret = metadata->fd; | |
142 | } | |
a1014f10 | 143 | |
fdbf3cee | 144 | return ret; |
a1014f10 EP |
145 | } |
146 | ||
f083441b JK |
147 | static struct fanotify_perm_event_info *dequeue_event( |
148 | struct fsnotify_group *group, int fd) | |
b2d87909 | 149 | { |
f083441b | 150 | struct fanotify_perm_event_info *event, *return_e = NULL; |
b2d87909 | 151 | |
073f6552 | 152 | spin_lock(&group->notification_lock); |
f083441b JK |
153 | list_for_each_entry(event, &group->fanotify_data.access_list, |
154 | fae.fse.list) { | |
155 | if (event->fd != fd) | |
b2d87909 EP |
156 | continue; |
157 | ||
f083441b JK |
158 | list_del_init(&event->fae.fse.list); |
159 | return_e = event; | |
b2d87909 EP |
160 | break; |
161 | } | |
073f6552 | 162 | spin_unlock(&group->notification_lock); |
b2d87909 | 163 | |
f083441b | 164 | pr_debug("%s: found return_re=%p\n", __func__, return_e); |
b2d87909 | 165 | |
f083441b | 166 | return return_e; |
b2d87909 EP |
167 | } |
168 | ||
169 | static int process_access_response(struct fsnotify_group *group, | |
170 | struct fanotify_response *response_struct) | |
171 | { | |
f083441b JK |
172 | struct fanotify_perm_event_info *event; |
173 | int fd = response_struct->fd; | |
174 | int response = response_struct->response; | |
b2d87909 EP |
175 | |
176 | pr_debug("%s: group=%p fd=%d response=%d\n", __func__, group, | |
177 | fd, response); | |
178 | /* | |
179 | * make sure the response is valid, if invalid we do nothing and either | |
25985edc | 180 | * userspace can send a valid response or we will clean it up after the |
b2d87909 EP |
181 | * timeout |
182 | */ | |
de8cd83e | 183 | switch (response & ~FAN_AUDIT) { |
b2d87909 EP |
184 | case FAN_ALLOW: |
185 | case FAN_DENY: | |
186 | break; | |
187 | default: | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | if (fd < 0) | |
192 | return -EINVAL; | |
193 | ||
96a71f21 | 194 | if ((response & FAN_AUDIT) && !FAN_GROUP_FLAG(group, FAN_ENABLE_AUDIT)) |
de8cd83e SG |
195 | return -EINVAL; |
196 | ||
f083441b JK |
197 | event = dequeue_event(group, fd); |
198 | if (!event) | |
b2d87909 EP |
199 | return -ENOENT; |
200 | ||
f083441b | 201 | event->response = response; |
b2d87909 EP |
202 | wake_up(&group->fanotify_data.access_waitq); |
203 | ||
b2d87909 EP |
204 | return 0; |
205 | } | |
b2d87909 | 206 | |
a1014f10 EP |
207 | static ssize_t copy_event_to_user(struct fsnotify_group *group, |
208 | struct fsnotify_event *event, | |
5b03a472 | 209 | char __user *buf, size_t count) |
a1014f10 EP |
210 | { |
211 | struct fanotify_event_metadata fanotify_event_metadata; | |
352e3b24 | 212 | struct file *f; |
b2d87909 | 213 | int fd, ret; |
a1014f10 EP |
214 | |
215 | pr_debug("%s: group=%p event=%p\n", __func__, group, event); | |
216 | ||
352e3b24 | 217 | ret = fill_event_metadata(group, &fanotify_event_metadata, event, &f); |
ecf6f5e7 | 218 | if (ret < 0) |
d507816b | 219 | return ret; |
b2d87909 | 220 | |
fdbf3cee | 221 | fd = fanotify_event_metadata.fd; |
b2d87909 | 222 | ret = -EFAULT; |
5b03a472 KC |
223 | /* |
224 | * Sanity check copy size in case get_one_event() and | |
225 | * fill_event_metadata() event_len sizes ever get out of sync. | |
226 | */ | |
227 | if (WARN_ON_ONCE(fanotify_event_metadata.event_len > count)) | |
228 | goto out_close_fd; | |
7d131623 EP |
229 | if (copy_to_user(buf, &fanotify_event_metadata, |
230 | fanotify_event_metadata.event_len)) | |
352e3b24 AV |
231 | goto out_close_fd; |
232 | ||
6685df31 | 233 | if (fanotify_is_perm_event(event->mask)) |
d507816b | 234 | FANOTIFY_PE(event)->fd = fd; |
a1014f10 | 235 | |
3587b1b0 AV |
236 | if (fd != FAN_NOFD) |
237 | fd_install(fd, f); | |
7d131623 | 238 | return fanotify_event_metadata.event_len; |
b2d87909 | 239 | |
b2d87909 | 240 | out_close_fd: |
352e3b24 AV |
241 | if (fd != FAN_NOFD) { |
242 | put_unused_fd(fd); | |
243 | fput(f); | |
244 | } | |
b2d87909 | 245 | return ret; |
a1014f10 EP |
246 | } |
247 | ||
248 | /* intofiy userspace file descriptor functions */ | |
076ccb76 | 249 | static __poll_t fanotify_poll(struct file *file, poll_table *wait) |
a1014f10 EP |
250 | { |
251 | struct fsnotify_group *group = file->private_data; | |
076ccb76 | 252 | __poll_t ret = 0; |
a1014f10 EP |
253 | |
254 | poll_wait(file, &group->notification_waitq, wait); | |
c21dbe20 | 255 | spin_lock(&group->notification_lock); |
a1014f10 | 256 | if (!fsnotify_notify_queue_is_empty(group)) |
a9a08845 | 257 | ret = EPOLLIN | EPOLLRDNORM; |
c21dbe20 | 258 | spin_unlock(&group->notification_lock); |
a1014f10 EP |
259 | |
260 | return ret; | |
261 | } | |
262 | ||
263 | static ssize_t fanotify_read(struct file *file, char __user *buf, | |
264 | size_t count, loff_t *pos) | |
265 | { | |
266 | struct fsnotify_group *group; | |
267 | struct fsnotify_event *kevent; | |
268 | char __user *start; | |
269 | int ret; | |
536ebe9c | 270 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
a1014f10 EP |
271 | |
272 | start = buf; | |
273 | group = file->private_data; | |
274 | ||
275 | pr_debug("%s: group=%p\n", __func__, group); | |
276 | ||
536ebe9c | 277 | add_wait_queue(&group->notification_waitq, &wait); |
a1014f10 | 278 | while (1) { |
c21dbe20 | 279 | spin_lock(&group->notification_lock); |
a1014f10 | 280 | kevent = get_one_event(group, count); |
c21dbe20 | 281 | spin_unlock(&group->notification_lock); |
a1014f10 | 282 | |
d8aaab4f | 283 | if (IS_ERR(kevent)) { |
a1014f10 | 284 | ret = PTR_ERR(kevent); |
d8aaab4f JK |
285 | break; |
286 | } | |
287 | ||
288 | if (!kevent) { | |
289 | ret = -EAGAIN; | |
290 | if (file->f_flags & O_NONBLOCK) | |
a1014f10 | 291 | break; |
d8aaab4f JK |
292 | |
293 | ret = -ERESTARTSYS; | |
294 | if (signal_pending(current)) | |
295 | break; | |
296 | ||
297 | if (start != buf) | |
a1014f10 | 298 | break; |
536ebe9c PZ |
299 | |
300 | wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
a1014f10 EP |
301 | continue; |
302 | } | |
303 | ||
5b03a472 | 304 | ret = copy_event_to_user(group, kevent, buf, count); |
4ff33aaf AG |
305 | if (unlikely(ret == -EOPENSTALE)) { |
306 | /* | |
307 | * We cannot report events with stale fd so drop it. | |
308 | * Setting ret to 0 will continue the event loop and | |
309 | * do the right thing if there are no more events to | |
310 | * read (i.e. return bytes read, -EAGAIN or wait). | |
311 | */ | |
312 | ret = 0; | |
313 | } | |
314 | ||
d8aaab4f JK |
315 | /* |
316 | * Permission events get queued to wait for response. Other | |
317 | * events can be destroyed now. | |
318 | */ | |
6685df31 | 319 | if (!fanotify_is_perm_event(kevent->mask)) { |
d8aaab4f | 320 | fsnotify_destroy_event(group, kevent); |
d507816b | 321 | } else { |
4ff33aaf | 322 | if (ret <= 0) { |
d507816b JK |
323 | FANOTIFY_PE(kevent)->response = FAN_DENY; |
324 | wake_up(&group->fanotify_data.access_waitq); | |
4ff33aaf AG |
325 | } else { |
326 | spin_lock(&group->notification_lock); | |
327 | list_add_tail(&kevent->list, | |
328 | &group->fanotify_data.access_list); | |
329 | spin_unlock(&group->notification_lock); | |
d507816b | 330 | } |
d507816b | 331 | } |
4ff33aaf AG |
332 | if (ret < 0) |
333 | break; | |
d8aaab4f JK |
334 | buf += ret; |
335 | count -= ret; | |
a1014f10 | 336 | } |
536ebe9c | 337 | remove_wait_queue(&group->notification_waitq, &wait); |
a1014f10 | 338 | |
a1014f10 EP |
339 | if (start != buf && ret != -EFAULT) |
340 | ret = buf - start; | |
341 | return ret; | |
342 | } | |
343 | ||
b2d87909 EP |
344 | static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) |
345 | { | |
b2d87909 EP |
346 | struct fanotify_response response = { .fd = -1, .response = -1 }; |
347 | struct fsnotify_group *group; | |
348 | int ret; | |
349 | ||
6685df31 MS |
350 | if (!IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) |
351 | return -EINVAL; | |
352 | ||
b2d87909 EP |
353 | group = file->private_data; |
354 | ||
355 | if (count > sizeof(response)) | |
356 | count = sizeof(response); | |
357 | ||
358 | pr_debug("%s: group=%p count=%zu\n", __func__, group, count); | |
359 | ||
360 | if (copy_from_user(&response, buf, count)) | |
361 | return -EFAULT; | |
362 | ||
363 | ret = process_access_response(group, &response); | |
364 | if (ret < 0) | |
365 | count = ret; | |
366 | ||
367 | return count; | |
b2d87909 EP |
368 | } |
369 | ||
52c923dd EP |
370 | static int fanotify_release(struct inode *ignored, struct file *file) |
371 | { | |
372 | struct fsnotify_group *group = file->private_data; | |
f083441b | 373 | struct fanotify_perm_event_info *event, *next; |
96d41019 | 374 | struct fsnotify_event *fsn_event; |
19ba54f4 | 375 | |
5838d444 | 376 | /* |
96d41019 JK |
377 | * Stop new events from arriving in the notification queue. since |
378 | * userspace cannot use fanotify fd anymore, no event can enter or | |
379 | * leave access_list by now either. | |
5838d444 | 380 | */ |
96d41019 | 381 | fsnotify_group_stop_queueing(group); |
2eebf582 | 382 | |
96d41019 JK |
383 | /* |
384 | * Process all permission events on access_list and notification queue | |
385 | * and simulate reply from userspace. | |
386 | */ | |
073f6552 | 387 | spin_lock(&group->notification_lock); |
f083441b JK |
388 | list_for_each_entry_safe(event, next, &group->fanotify_data.access_list, |
389 | fae.fse.list) { | |
390 | pr_debug("%s: found group=%p event=%p\n", __func__, group, | |
391 | event); | |
2eebf582 | 392 | |
f083441b JK |
393 | list_del_init(&event->fae.fse.list); |
394 | event->response = FAN_ALLOW; | |
2eebf582 | 395 | } |
2eebf582 | 396 | |
5838d444 | 397 | /* |
96d41019 JK |
398 | * Destroy all non-permission events. For permission events just |
399 | * dequeue them and set the response. They will be freed once the | |
400 | * response is consumed and fanotify_get_response() returns. | |
5838d444 | 401 | */ |
96d41019 JK |
402 | while (!fsnotify_notify_queue_is_empty(group)) { |
403 | fsn_event = fsnotify_remove_first_event(group); | |
23c9deeb | 404 | if (!(fsn_event->mask & FANOTIFY_PERM_EVENTS)) { |
c21dbe20 | 405 | spin_unlock(&group->notification_lock); |
96d41019 | 406 | fsnotify_destroy_event(group, fsn_event); |
c21dbe20 | 407 | spin_lock(&group->notification_lock); |
6685df31 | 408 | } else { |
96d41019 | 409 | FANOTIFY_PE(fsn_event)->response = FAN_ALLOW; |
6685df31 | 410 | } |
96d41019 | 411 | } |
c21dbe20 | 412 | spin_unlock(&group->notification_lock); |
96d41019 JK |
413 | |
414 | /* Response for all permission events it set, wakeup waiters */ | |
2eebf582 | 415 | wake_up(&group->fanotify_data.access_waitq); |
0a6b6bd5 | 416 | |
52c923dd | 417 | /* matches the fanotify_init->fsnotify_alloc_group */ |
d8153d4d | 418 | fsnotify_destroy_group(group); |
52c923dd EP |
419 | |
420 | return 0; | |
421 | } | |
422 | ||
a1014f10 EP |
423 | static long fanotify_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
424 | { | |
425 | struct fsnotify_group *group; | |
7053aee2 | 426 | struct fsnotify_event *fsn_event; |
a1014f10 EP |
427 | void __user *p; |
428 | int ret = -ENOTTY; | |
429 | size_t send_len = 0; | |
430 | ||
431 | group = file->private_data; | |
432 | ||
433 | p = (void __user *) arg; | |
434 | ||
435 | switch (cmd) { | |
436 | case FIONREAD: | |
c21dbe20 | 437 | spin_lock(&group->notification_lock); |
7053aee2 | 438 | list_for_each_entry(fsn_event, &group->notification_list, list) |
a1014f10 | 439 | send_len += FAN_EVENT_METADATA_LEN; |
c21dbe20 | 440 | spin_unlock(&group->notification_lock); |
a1014f10 EP |
441 | ret = put_user(send_len, (int __user *) p); |
442 | break; | |
443 | } | |
444 | ||
445 | return ret; | |
446 | } | |
447 | ||
52c923dd | 448 | static const struct file_operations fanotify_fops = { |
be77196b | 449 | .show_fdinfo = fanotify_show_fdinfo, |
a1014f10 EP |
450 | .poll = fanotify_poll, |
451 | .read = fanotify_read, | |
b2d87909 | 452 | .write = fanotify_write, |
52c923dd EP |
453 | .fasync = NULL, |
454 | .release = fanotify_release, | |
a1014f10 EP |
455 | .unlocked_ioctl = fanotify_ioctl, |
456 | .compat_ioctl = fanotify_ioctl, | |
6038f373 | 457 | .llseek = noop_llseek, |
52c923dd EP |
458 | }; |
459 | ||
2a3edf86 EP |
460 | static int fanotify_find_path(int dfd, const char __user *filename, |
461 | struct path *path, unsigned int flags) | |
462 | { | |
463 | int ret; | |
464 | ||
465 | pr_debug("%s: dfd=%d filename=%p flags=%x\n", __func__, | |
466 | dfd, filename, flags); | |
467 | ||
468 | if (filename == NULL) { | |
2903ff01 | 469 | struct fd f = fdget(dfd); |
2a3edf86 EP |
470 | |
471 | ret = -EBADF; | |
2903ff01 | 472 | if (!f.file) |
2a3edf86 EP |
473 | goto out; |
474 | ||
475 | ret = -ENOTDIR; | |
476 | if ((flags & FAN_MARK_ONLYDIR) && | |
496ad9aa | 477 | !(S_ISDIR(file_inode(f.file)->i_mode))) { |
2903ff01 | 478 | fdput(f); |
2a3edf86 EP |
479 | goto out; |
480 | } | |
481 | ||
2903ff01 | 482 | *path = f.file->f_path; |
2a3edf86 | 483 | path_get(path); |
2903ff01 | 484 | fdput(f); |
2a3edf86 EP |
485 | } else { |
486 | unsigned int lookup_flags = 0; | |
487 | ||
488 | if (!(flags & FAN_MARK_DONT_FOLLOW)) | |
489 | lookup_flags |= LOOKUP_FOLLOW; | |
490 | if (flags & FAN_MARK_ONLYDIR) | |
491 | lookup_flags |= LOOKUP_DIRECTORY; | |
492 | ||
493 | ret = user_path_at(dfd, filename, lookup_flags, path); | |
494 | if (ret) | |
495 | goto out; | |
496 | } | |
497 | ||
498 | /* you can only watch an inode if you have read permissions on it */ | |
499 | ret = inode_permission(path->dentry->d_inode, MAY_READ); | |
500 | if (ret) | |
501 | path_put(path); | |
502 | out: | |
503 | return ret; | |
504 | } | |
505 | ||
b9e4e3bd EP |
506 | static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark, |
507 | __u32 mask, | |
6dfbd149 LS |
508 | unsigned int flags, |
509 | int *destroy) | |
088b09b0 | 510 | { |
d2c1874c | 511 | __u32 oldmask = 0; |
088b09b0 AG |
512 | |
513 | spin_lock(&fsn_mark->lock); | |
b9e4e3bd EP |
514 | if (!(flags & FAN_MARK_IGNORED_MASK)) { |
515 | oldmask = fsn_mark->mask; | |
a72fd224 | 516 | fsn_mark->mask &= ~mask; |
b9e4e3bd | 517 | } else { |
a72fd224 | 518 | fsn_mark->ignored_mask &= ~mask; |
b9e4e3bd | 519 | } |
a118449a | 520 | *destroy = !(fsn_mark->mask | fsn_mark->ignored_mask); |
088b09b0 AG |
521 | spin_unlock(&fsn_mark->lock); |
522 | ||
088b09b0 AG |
523 | return mask & oldmask; |
524 | } | |
525 | ||
eaa2c6b0 AG |
526 | static int fanotify_remove_mark(struct fsnotify_group *group, |
527 | fsnotify_connp_t *connp, __u32 mask, | |
528 | unsigned int flags) | |
88826276 EP |
529 | { |
530 | struct fsnotify_mark *fsn_mark = NULL; | |
088b09b0 | 531 | __u32 removed; |
6dfbd149 | 532 | int destroy_mark; |
88826276 | 533 | |
7b18527c | 534 | mutex_lock(&group->mark_mutex); |
eaa2c6b0 | 535 | fsn_mark = fsnotify_find_mark(connp, group); |
7b18527c LS |
536 | if (!fsn_mark) { |
537 | mutex_unlock(&group->mark_mutex); | |
f3640192 | 538 | return -ENOENT; |
7b18527c | 539 | } |
88826276 | 540 | |
6dfbd149 LS |
541 | removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags, |
542 | &destroy_mark); | |
3ac70bfc AG |
543 | if (removed & fsnotify_conn_mask(fsn_mark->connector)) |
544 | fsnotify_recalc_mask(fsn_mark->connector); | |
6dfbd149 | 545 | if (destroy_mark) |
4712e722 | 546 | fsnotify_detach_mark(fsn_mark); |
7b18527c | 547 | mutex_unlock(&group->mark_mutex); |
4712e722 JK |
548 | if (destroy_mark) |
549 | fsnotify_free_mark(fsn_mark); | |
6dfbd149 | 550 | |
eaa2c6b0 | 551 | /* matches the fsnotify_find_mark() */ |
f3640192 | 552 | fsnotify_put_mark(fsn_mark); |
f3640192 AG |
553 | return 0; |
554 | } | |
2a3edf86 | 555 | |
eaa2c6b0 AG |
556 | static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group, |
557 | struct vfsmount *mnt, __u32 mask, | |
558 | unsigned int flags) | |
559 | { | |
560 | return fanotify_remove_mark(group, &real_mount(mnt)->mnt_fsnotify_marks, | |
561 | mask, flags); | |
562 | } | |
563 | ||
d54f4fba AG |
564 | static int fanotify_remove_sb_mark(struct fsnotify_group *group, |
565 | struct super_block *sb, __u32 mask, | |
566 | unsigned int flags) | |
567 | { | |
568 | return fanotify_remove_mark(group, &sb->s_fsnotify_marks, mask, flags); | |
569 | } | |
570 | ||
f3640192 | 571 | static int fanotify_remove_inode_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
572 | struct inode *inode, __u32 mask, |
573 | unsigned int flags) | |
f3640192 | 574 | { |
eaa2c6b0 AG |
575 | return fanotify_remove_mark(group, &inode->i_fsnotify_marks, mask, |
576 | flags); | |
2a3edf86 EP |
577 | } |
578 | ||
b9e4e3bd EP |
579 | static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark, |
580 | __u32 mask, | |
581 | unsigned int flags) | |
912ee394 | 582 | { |
192ca4d1 | 583 | __u32 oldmask = -1; |
912ee394 AG |
584 | |
585 | spin_lock(&fsn_mark->lock); | |
b9e4e3bd EP |
586 | if (!(flags & FAN_MARK_IGNORED_MASK)) { |
587 | oldmask = fsn_mark->mask; | |
a72fd224 | 588 | fsn_mark->mask |= mask; |
b9e4e3bd | 589 | } else { |
a72fd224 | 590 | fsn_mark->ignored_mask |= mask; |
c9778a98 EP |
591 | if (flags & FAN_MARK_IGNORED_SURV_MODIFY) |
592 | fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY; | |
b9e4e3bd | 593 | } |
912ee394 AG |
594 | spin_unlock(&fsn_mark->lock); |
595 | ||
596 | return mask & ~oldmask; | |
597 | } | |
598 | ||
5e9c070c | 599 | static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group, |
b812a9f5 AG |
600 | fsnotify_connp_t *connp, |
601 | unsigned int type) | |
5e9c070c LS |
602 | { |
603 | struct fsnotify_mark *mark; | |
604 | int ret; | |
605 | ||
606 | if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks) | |
607 | return ERR_PTR(-ENOSPC); | |
608 | ||
609 | mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL); | |
610 | if (!mark) | |
611 | return ERR_PTR(-ENOMEM); | |
612 | ||
054c636e | 613 | fsnotify_init_mark(mark, group); |
b812a9f5 | 614 | ret = fsnotify_add_mark_locked(mark, connp, type, 0); |
5e9c070c LS |
615 | if (ret) { |
616 | fsnotify_put_mark(mark); | |
617 | return ERR_PTR(ret); | |
618 | } | |
619 | ||
620 | return mark; | |
621 | } | |
622 | ||
623 | ||
eaa2c6b0 AG |
624 | static int fanotify_add_mark(struct fsnotify_group *group, |
625 | fsnotify_connp_t *connp, unsigned int type, | |
626 | __u32 mask, unsigned int flags) | |
2a3edf86 EP |
627 | { |
628 | struct fsnotify_mark *fsn_mark; | |
912ee394 | 629 | __u32 added; |
2a3edf86 | 630 | |
7b18527c | 631 | mutex_lock(&group->mark_mutex); |
b812a9f5 | 632 | fsn_mark = fsnotify_find_mark(connp, group); |
88826276 | 633 | if (!fsn_mark) { |
eaa2c6b0 | 634 | fsn_mark = fanotify_add_new_mark(group, connp, type); |
5e9c070c | 635 | if (IS_ERR(fsn_mark)) { |
7b18527c | 636 | mutex_unlock(&group->mark_mutex); |
5e9c070c | 637 | return PTR_ERR(fsn_mark); |
7b18527c | 638 | } |
88826276 | 639 | } |
b9e4e3bd | 640 | added = fanotify_mark_add_to_mask(fsn_mark, mask, flags); |
3ac70bfc AG |
641 | if (added & ~fsnotify_conn_mask(fsn_mark->connector)) |
642 | fsnotify_recalc_mask(fsn_mark->connector); | |
c9747640 | 643 | mutex_unlock(&group->mark_mutex); |
5e9c070c | 644 | |
fa218ab9 | 645 | fsnotify_put_mark(fsn_mark); |
5e9c070c | 646 | return 0; |
88826276 EP |
647 | } |
648 | ||
eaa2c6b0 AG |
649 | static int fanotify_add_vfsmount_mark(struct fsnotify_group *group, |
650 | struct vfsmount *mnt, __u32 mask, | |
651 | unsigned int flags) | |
652 | { | |
653 | return fanotify_add_mark(group, &real_mount(mnt)->mnt_fsnotify_marks, | |
654 | FSNOTIFY_OBJ_TYPE_VFSMOUNT, mask, flags); | |
655 | } | |
656 | ||
d54f4fba AG |
657 | static int fanotify_add_sb_mark(struct fsnotify_group *group, |
658 | struct super_block *sb, __u32 mask, | |
659 | unsigned int flags) | |
660 | { | |
661 | return fanotify_add_mark(group, &sb->s_fsnotify_marks, | |
662 | FSNOTIFY_OBJ_TYPE_SB, mask, flags); | |
663 | } | |
664 | ||
52202dfb | 665 | static int fanotify_add_inode_mark(struct fsnotify_group *group, |
b9e4e3bd EP |
666 | struct inode *inode, __u32 mask, |
667 | unsigned int flags) | |
88826276 | 668 | { |
88826276 | 669 | pr_debug("%s: group=%p inode=%p\n", __func__, group, inode); |
2a3edf86 | 670 | |
5322a59f EP |
671 | /* |
672 | * If some other task has this inode open for write we should not add | |
673 | * an ignored mark, unless that ignored mark is supposed to survive | |
674 | * modification changes anyway. | |
675 | */ | |
676 | if ((flags & FAN_MARK_IGNORED_MASK) && | |
677 | !(flags & FAN_MARK_IGNORED_SURV_MODIFY) && | |
678 | (atomic_read(&inode->i_writecount) > 0)) | |
679 | return 0; | |
680 | ||
eaa2c6b0 AG |
681 | return fanotify_add_mark(group, &inode->i_fsnotify_marks, |
682 | FSNOTIFY_OBJ_TYPE_INODE, mask, flags); | |
88826276 | 683 | } |
2a3edf86 | 684 | |
52c923dd | 685 | /* fanotify syscalls */ |
08ae8938 | 686 | SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags) |
11637e4b | 687 | { |
52c923dd EP |
688 | struct fsnotify_group *group; |
689 | int f_flags, fd; | |
4afeff85 | 690 | struct user_struct *user; |
ff57cd58 | 691 | struct fanotify_event_info *oevent; |
52c923dd | 692 | |
96a71f21 AG |
693 | pr_debug("%s: flags=%x event_f_flags=%x\n", |
694 | __func__, flags, event_f_flags); | |
52c923dd | 695 | |
52c923dd | 696 | if (!capable(CAP_SYS_ADMIN)) |
a2f13ad0 | 697 | return -EPERM; |
52c923dd | 698 | |
de8cd83e | 699 | #ifdef CONFIG_AUDITSYSCALL |
23c9deeb | 700 | if (flags & ~(FANOTIFY_INIT_FLAGS | FAN_ENABLE_AUDIT)) |
de8cd83e | 701 | #else |
23c9deeb | 702 | if (flags & ~FANOTIFY_INIT_FLAGS) |
de8cd83e | 703 | #endif |
52c923dd EP |
704 | return -EINVAL; |
705 | ||
48149e9d HS |
706 | if (event_f_flags & ~FANOTIFY_INIT_ALL_EVENT_F_BITS) |
707 | return -EINVAL; | |
708 | ||
709 | switch (event_f_flags & O_ACCMODE) { | |
710 | case O_RDONLY: | |
711 | case O_RDWR: | |
712 | case O_WRONLY: | |
713 | break; | |
714 | default: | |
715 | return -EINVAL; | |
716 | } | |
717 | ||
4afeff85 EP |
718 | user = get_current_user(); |
719 | if (atomic_read(&user->fanotify_listeners) > FANOTIFY_DEFAULT_MAX_LISTENERS) { | |
720 | free_uid(user); | |
721 | return -EMFILE; | |
722 | } | |
723 | ||
b2d87909 | 724 | f_flags = O_RDWR | FMODE_NONOTIFY; |
52c923dd EP |
725 | if (flags & FAN_CLOEXEC) |
726 | f_flags |= O_CLOEXEC; | |
727 | if (flags & FAN_NONBLOCK) | |
728 | f_flags |= O_NONBLOCK; | |
729 | ||
730 | /* fsnotify_alloc_group takes a ref. Dropped in fanotify_release */ | |
731 | group = fsnotify_alloc_group(&fanotify_fsnotify_ops); | |
26379198 EP |
732 | if (IS_ERR(group)) { |
733 | free_uid(user); | |
52c923dd | 734 | return PTR_ERR(group); |
26379198 | 735 | } |
52c923dd | 736 | |
4afeff85 | 737 | group->fanotify_data.user = user; |
96a71f21 | 738 | group->fanotify_data.flags = flags; |
4afeff85 | 739 | atomic_inc(&user->fanotify_listeners); |
d46eb14b | 740 | group->memcg = get_mem_cgroup_from_mm(current->mm); |
4afeff85 | 741 | |
1f5eaa90 | 742 | oevent = fanotify_alloc_event(group, NULL, FS_Q_OVERFLOW, NULL); |
ff57cd58 JK |
743 | if (unlikely(!oevent)) { |
744 | fd = -ENOMEM; | |
745 | goto out_destroy_group; | |
746 | } | |
747 | group->overflow_event = &oevent->fse; | |
ff57cd58 | 748 | |
1e2ee49f WW |
749 | if (force_o_largefile()) |
750 | event_f_flags |= O_LARGEFILE; | |
80af2588 | 751 | group->fanotify_data.f_flags = event_f_flags; |
9e66e423 EP |
752 | init_waitqueue_head(&group->fanotify_data.access_waitq); |
753 | INIT_LIST_HEAD(&group->fanotify_data.access_list); | |
23c9deeb | 754 | switch (flags & FANOTIFY_CLASS_BITS) { |
4231a235 EP |
755 | case FAN_CLASS_NOTIF: |
756 | group->priority = FS_PRIO_0; | |
757 | break; | |
758 | case FAN_CLASS_CONTENT: | |
759 | group->priority = FS_PRIO_1; | |
760 | break; | |
761 | case FAN_CLASS_PRE_CONTENT: | |
762 | group->priority = FS_PRIO_2; | |
763 | break; | |
764 | default: | |
765 | fd = -EINVAL; | |
d8153d4d | 766 | goto out_destroy_group; |
4231a235 | 767 | } |
cb2d429f | 768 | |
5dd03f55 EP |
769 | if (flags & FAN_UNLIMITED_QUEUE) { |
770 | fd = -EPERM; | |
771 | if (!capable(CAP_SYS_ADMIN)) | |
d8153d4d | 772 | goto out_destroy_group; |
5dd03f55 EP |
773 | group->max_events = UINT_MAX; |
774 | } else { | |
775 | group->max_events = FANOTIFY_DEFAULT_MAX_EVENTS; | |
776 | } | |
2529a0df | 777 | |
ac7e22dc EP |
778 | if (flags & FAN_UNLIMITED_MARKS) { |
779 | fd = -EPERM; | |
780 | if (!capable(CAP_SYS_ADMIN)) | |
d8153d4d | 781 | goto out_destroy_group; |
ac7e22dc EP |
782 | group->fanotify_data.max_marks = UINT_MAX; |
783 | } else { | |
784 | group->fanotify_data.max_marks = FANOTIFY_DEFAULT_MAX_MARKS; | |
785 | } | |
e7099d8a | 786 | |
de8cd83e SG |
787 | if (flags & FAN_ENABLE_AUDIT) { |
788 | fd = -EPERM; | |
789 | if (!capable(CAP_AUDIT_WRITE)) | |
790 | goto out_destroy_group; | |
de8cd83e SG |
791 | } |
792 | ||
52c923dd EP |
793 | fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags); |
794 | if (fd < 0) | |
d8153d4d | 795 | goto out_destroy_group; |
52c923dd EP |
796 | |
797 | return fd; | |
798 | ||
d8153d4d LS |
799 | out_destroy_group: |
800 | fsnotify_destroy_group(group); | |
52c923dd | 801 | return fd; |
11637e4b | 802 | } |
bbaa4168 | 803 | |
183caa3c DB |
804 | static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask, |
805 | int dfd, const char __user *pathname) | |
bbaa4168 | 806 | { |
0ff21db9 EP |
807 | struct inode *inode = NULL; |
808 | struct vfsmount *mnt = NULL; | |
2a3edf86 | 809 | struct fsnotify_group *group; |
2903ff01 | 810 | struct fd f; |
2a3edf86 | 811 | struct path path; |
bdd5a46f | 812 | u32 valid_mask = FANOTIFY_EVENTS | FANOTIFY_EVENT_FLAGS; |
23c9deeb | 813 | unsigned int mark_type = flags & FANOTIFY_MARK_TYPE_BITS; |
2903ff01 | 814 | int ret; |
2a3edf86 EP |
815 | |
816 | pr_debug("%s: fanotify_fd=%d flags=%x dfd=%d pathname=%p mask=%llx\n", | |
817 | __func__, fanotify_fd, flags, dfd, pathname, mask); | |
818 | ||
819 | /* we only use the lower 32 bits as of right now. */ | |
820 | if (mask & ((__u64)0xffffffff << 32)) | |
821 | return -EINVAL; | |
822 | ||
23c9deeb | 823 | if (flags & ~FANOTIFY_MARK_FLAGS) |
88380fe6 | 824 | return -EINVAL; |
d54f4fba AG |
825 | |
826 | switch (mark_type) { | |
827 | case FAN_MARK_INODE: | |
828 | case FAN_MARK_MOUNT: | |
829 | case FAN_MARK_FILESYSTEM: | |
830 | break; | |
831 | default: | |
832 | return -EINVAL; | |
833 | } | |
834 | ||
4d92604c | 835 | switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) { |
1734dee4 | 836 | case FAN_MARK_ADD: /* fallthrough */ |
88380fe6 | 837 | case FAN_MARK_REMOVE: |
1734dee4 LS |
838 | if (!mask) |
839 | return -EINVAL; | |
cc299a98 | 840 | break; |
4d92604c | 841 | case FAN_MARK_FLUSH: |
23c9deeb | 842 | if (flags & ~(FANOTIFY_MARK_TYPE_BITS | FAN_MARK_FLUSH)) |
cc299a98 | 843 | return -EINVAL; |
88380fe6 AG |
844 | break; |
845 | default: | |
846 | return -EINVAL; | |
847 | } | |
8fcd6528 | 848 | |
6685df31 | 849 | if (IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) |
23c9deeb | 850 | valid_mask |= FANOTIFY_PERM_EVENTS; |
6685df31 MS |
851 | |
852 | if (mask & ~valid_mask) | |
2a3edf86 EP |
853 | return -EINVAL; |
854 | ||
2903ff01 AV |
855 | f = fdget(fanotify_fd); |
856 | if (unlikely(!f.file)) | |
2a3edf86 EP |
857 | return -EBADF; |
858 | ||
859 | /* verify that this is indeed an fanotify instance */ | |
860 | ret = -EINVAL; | |
2903ff01 | 861 | if (unlikely(f.file->f_op != &fanotify_fops)) |
2a3edf86 | 862 | goto fput_and_out; |
2903ff01 | 863 | group = f.file->private_data; |
4231a235 EP |
864 | |
865 | /* | |
866 | * group->priority == FS_PRIO_0 == FAN_CLASS_NOTIF. These are not | |
867 | * allowed to set permissions events. | |
868 | */ | |
869 | ret = -EINVAL; | |
23c9deeb | 870 | if (mask & FANOTIFY_PERM_EVENTS && |
4231a235 EP |
871 | group->priority == FS_PRIO_0) |
872 | goto fput_and_out; | |
2a3edf86 | 873 | |
0a8dd2db HS |
874 | if (flags & FAN_MARK_FLUSH) { |
875 | ret = 0; | |
d54f4fba | 876 | if (mark_type == FAN_MARK_MOUNT) |
0a8dd2db | 877 | fsnotify_clear_vfsmount_marks_by_group(group); |
d54f4fba AG |
878 | else if (mark_type == FAN_MARK_FILESYSTEM) |
879 | fsnotify_clear_sb_marks_by_group(group); | |
0a8dd2db HS |
880 | else |
881 | fsnotify_clear_inode_marks_by_group(group); | |
882 | goto fput_and_out; | |
883 | } | |
884 | ||
2a3edf86 EP |
885 | ret = fanotify_find_path(dfd, pathname, &path, flags); |
886 | if (ret) | |
887 | goto fput_and_out; | |
888 | ||
889 | /* inode held in place by reference to path; group by fget on fd */ | |
d54f4fba | 890 | if (mark_type == FAN_MARK_INODE) |
0ff21db9 EP |
891 | inode = path.dentry->d_inode; |
892 | else | |
893 | mnt = path.mnt; | |
2a3edf86 EP |
894 | |
895 | /* create/update an inode mark */ | |
0a8dd2db | 896 | switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) { |
c6223f46 | 897 | case FAN_MARK_ADD: |
d54f4fba | 898 | if (mark_type == FAN_MARK_MOUNT) |
b9e4e3bd | 899 | ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags); |
d54f4fba AG |
900 | else if (mark_type == FAN_MARK_FILESYSTEM) |
901 | ret = fanotify_add_sb_mark(group, mnt->mnt_sb, mask, flags); | |
0ff21db9 | 902 | else |
b9e4e3bd | 903 | ret = fanotify_add_inode_mark(group, inode, mask, flags); |
c6223f46 AG |
904 | break; |
905 | case FAN_MARK_REMOVE: | |
d54f4fba | 906 | if (mark_type == FAN_MARK_MOUNT) |
b9e4e3bd | 907 | ret = fanotify_remove_vfsmount_mark(group, mnt, mask, flags); |
d54f4fba AG |
908 | else if (mark_type == FAN_MARK_FILESYSTEM) |
909 | ret = fanotify_remove_sb_mark(group, mnt->mnt_sb, mask, flags); | |
f3640192 | 910 | else |
b9e4e3bd | 911 | ret = fanotify_remove_inode_mark(group, inode, mask, flags); |
c6223f46 AG |
912 | break; |
913 | default: | |
914 | ret = -EINVAL; | |
915 | } | |
2a3edf86 EP |
916 | |
917 | path_put(&path); | |
918 | fput_and_out: | |
2903ff01 | 919 | fdput(f); |
2a3edf86 EP |
920 | return ret; |
921 | } | |
922 | ||
183caa3c DB |
923 | SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags, |
924 | __u64, mask, int, dfd, | |
925 | const char __user *, pathname) | |
926 | { | |
927 | return do_fanotify_mark(fanotify_fd, flags, mask, dfd, pathname); | |
928 | } | |
929 | ||
91c2e0bc AV |
930 | #ifdef CONFIG_COMPAT |
931 | COMPAT_SYSCALL_DEFINE6(fanotify_mark, | |
932 | int, fanotify_fd, unsigned int, flags, | |
933 | __u32, mask0, __u32, mask1, int, dfd, | |
934 | const char __user *, pathname) | |
935 | { | |
183caa3c | 936 | return do_fanotify_mark(fanotify_fd, flags, |
91c2e0bc | 937 | #ifdef __BIG_ENDIAN |
91c2e0bc | 938 | ((__u64)mask0 << 32) | mask1, |
592f6b84 HC |
939 | #else |
940 | ((__u64)mask1 << 32) | mask0, | |
91c2e0bc AV |
941 | #endif |
942 | dfd, pathname); | |
943 | } | |
944 | #endif | |
945 | ||
2a3edf86 | 946 | /* |
ae0e47f0 | 947 | * fanotify_user_setup - Our initialization function. Note that we cannot return |
2a3edf86 EP |
948 | * error because we have compiled-in VFS hooks. So an (unlikely) failure here |
949 | * must result in panic(). | |
950 | */ | |
951 | static int __init fanotify_user_setup(void) | |
952 | { | |
d0a6a87e | 953 | BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 7); |
bdd5a46f AG |
954 | BUILD_BUG_ON(HWEIGHT32(FANOTIFY_MARK_FLAGS) != 9); |
955 | ||
d46eb14b SB |
956 | fanotify_mark_cache = KMEM_CACHE(fsnotify_mark, |
957 | SLAB_PANIC|SLAB_ACCOUNT); | |
7053aee2 | 958 | fanotify_event_cachep = KMEM_CACHE(fanotify_event_info, SLAB_PANIC); |
6685df31 MS |
959 | if (IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) { |
960 | fanotify_perm_event_cachep = | |
961 | KMEM_CACHE(fanotify_perm_event_info, SLAB_PANIC); | |
962 | } | |
2a3edf86 EP |
963 | |
964 | return 0; | |
bbaa4168 | 965 | } |
2a3edf86 | 966 | device_initcall(fanotify_user_setup); |