1 #include <linux/fanotify.h>
2 #include <linux/fcntl.h>
3 #include <linux/file.h>
5 #include <linux/anon_inodes.h>
6 #include <linux/fsnotify_backend.h>
7 #include <linux/init.h>
8 #include <linux/mount.h>
9 #include <linux/namei.h>
10 #include <linux/poll.h>
11 #include <linux/security.h>
12 #include <linux/syscalls.h>
13 #include <linux/slab.h>
14 #include <linux/types.h>
15 #include <linux/uaccess.h>
16 #include <linux/compat.h>
18 #include <asm/ioctls.h>
20 #include "../../mount.h"
21 #include "../fdinfo.h"
24 #define FANOTIFY_DEFAULT_MAX_EVENTS 16384
25 #define FANOTIFY_DEFAULT_MAX_MARKS 8192
26 #define FANOTIFY_DEFAULT_MAX_LISTENERS 128
29 * All flags that may be specified in parameter event_f_flags of fanotify_init.
31 * Internal and external open flags are stored together in field f_flags of
32 * struct file. Only external open flags shall be allowed in event_f_flags.
33 * Internal flags like FMODE_NONOTIFY, FMODE_EXEC, FMODE_NOCMTIME shall be
36 #define FANOTIFY_INIT_ALL_EVENT_F_BITS ( \
37 O_ACCMODE | O_APPEND | O_NONBLOCK | \
38 __O_SYNC | O_DSYNC | O_CLOEXEC | \
39 O_LARGEFILE | O_NOATIME )
41 extern const struct fsnotify_ops fanotify_fsnotify_ops;
43 static struct kmem_cache *fanotify_mark_cache __read_mostly;
44 struct kmem_cache *fanotify_event_cachep __read_mostly;
45 struct kmem_cache *fanotify_perm_event_cachep __read_mostly;
48 * Get an fsnotify notification event if one exists and is small
49 * enough to fit in "count". Return an error pointer if the count
50 * is not large enough.
52 * Called with the group->notification_lock held.
54 static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
57 assert_spin_locked(&group->notification_lock);
59 pr_debug("%s: group=%p count=%zd\n", __func__, group, count);
61 if (fsnotify_notify_queue_is_empty(group))
64 if (FAN_EVENT_METADATA_LEN > count)
65 return ERR_PTR(-EINVAL);
67 /* held the notification_lock the whole time, so this is the
68 * same event we peeked above */
69 return fsnotify_remove_first_event(group);
72 static int create_fd(struct fsnotify_group *group,
73 struct fanotify_event_info *event,
77 struct file *new_file;
79 pr_debug("%s: group=%p event=%p\n", __func__, group, event);
81 client_fd = get_unused_fd_flags(group->fanotify_data.f_flags);
86 * we need a new file handle for the userspace program so it can read even if it was
87 * originally opened O_WRONLY.
89 /* it's possible this event was an overflow event. in that case dentry and mnt
90 * are NULL; That's fine, just don't call dentry open */
91 if (event->path.dentry && event->path.mnt)
92 new_file = dentry_open(&event->path,
93 group->fanotify_data.f_flags | FMODE_NONOTIFY,
96 new_file = ERR_PTR(-EOVERFLOW);
97 if (IS_ERR(new_file)) {
99 * we still send an event even if we can't open the file. this
100 * can happen when say tasks are gone and we try to open their
101 * /proc files or we try to open a WRONLY file like in sysfs
102 * we just send the errno to userspace since there isn't much
105 put_unused_fd(client_fd);
106 client_fd = PTR_ERR(new_file);
114 static int fill_event_metadata(struct fsnotify_group *group,
115 struct fanotify_event_metadata *metadata,
116 struct fsnotify_event *fsn_event,
120 struct fanotify_event_info *event;
122 pr_debug("%s: group=%p metadata=%p event=%p\n", __func__,
123 group, metadata, fsn_event);
126 event = container_of(fsn_event, struct fanotify_event_info, fse);
127 metadata->event_len = FAN_EVENT_METADATA_LEN;
128 metadata->metadata_len = FAN_EVENT_METADATA_LEN;
129 metadata->vers = FANOTIFY_METADATA_VERSION;
130 metadata->reserved = 0;
131 metadata->mask = fsn_event->mask & FAN_ALL_OUTGOING_EVENTS;
132 metadata->pid = pid_vnr(event->tgid);
133 if (unlikely(fsn_event->mask & FAN_Q_OVERFLOW))
134 metadata->fd = FAN_NOFD;
136 metadata->fd = create_fd(group, event, file);
137 if (metadata->fd < 0)
144 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
145 static struct fanotify_perm_event_info *dequeue_event(
146 struct fsnotify_group *group, int fd)
148 struct fanotify_perm_event_info *event, *return_e = NULL;
150 spin_lock(&group->notification_lock);
151 list_for_each_entry(event, &group->fanotify_data.access_list,
156 list_del_init(&event->fae.fse.list);
160 spin_unlock(&group->notification_lock);
162 pr_debug("%s: found return_re=%p\n", __func__, return_e);
167 static int process_access_response(struct fsnotify_group *group,
168 struct fanotify_response *response_struct)
170 struct fanotify_perm_event_info *event;
171 int fd = response_struct->fd;
172 int response = response_struct->response;
174 pr_debug("%s: group=%p fd=%d response=%d\n", __func__, group,
177 * make sure the response is valid, if invalid we do nothing and either
178 * userspace can send a valid response or we will clean it up after the
192 event = dequeue_event(group, fd);
196 event->response = response;
197 wake_up(&group->fanotify_data.access_waitq);
203 static ssize_t copy_event_to_user(struct fsnotify_group *group,
204 struct fsnotify_event *event,
207 struct fanotify_event_metadata fanotify_event_metadata;
211 pr_debug("%s: group=%p event=%p\n", __func__, group, event);
213 ret = fill_event_metadata(group, &fanotify_event_metadata, event, &f);
217 fd = fanotify_event_metadata.fd;
219 if (copy_to_user(buf, &fanotify_event_metadata,
220 fanotify_event_metadata.event_len))
223 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
224 if (event->mask & FAN_ALL_PERM_EVENTS)
225 FANOTIFY_PE(event)->fd = fd;
230 return fanotify_event_metadata.event_len;
233 if (fd != FAN_NOFD) {
240 /* intofiy userspace file descriptor functions */
241 static unsigned int fanotify_poll(struct file *file, poll_table *wait)
243 struct fsnotify_group *group = file->private_data;
246 poll_wait(file, &group->notification_waitq, wait);
247 spin_lock(&group->notification_lock);
248 if (!fsnotify_notify_queue_is_empty(group))
249 ret = POLLIN | POLLRDNORM;
250 spin_unlock(&group->notification_lock);
255 static ssize_t fanotify_read(struct file *file, char __user *buf,
256 size_t count, loff_t *pos)
258 struct fsnotify_group *group;
259 struct fsnotify_event *kevent;
262 DEFINE_WAIT_FUNC(wait, woken_wake_function);
265 group = file->private_data;
267 pr_debug("%s: group=%p\n", __func__, group);
269 add_wait_queue(&group->notification_waitq, &wait);
271 spin_lock(&group->notification_lock);
272 kevent = get_one_event(group, count);
273 spin_unlock(&group->notification_lock);
275 if (IS_ERR(kevent)) {
276 ret = PTR_ERR(kevent);
282 if (file->f_flags & O_NONBLOCK)
286 if (signal_pending(current))
292 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
296 ret = copy_event_to_user(group, kevent, buf);
298 * Permission events get queued to wait for response. Other
299 * events can be destroyed now.
301 if (!(kevent->mask & FAN_ALL_PERM_EVENTS)) {
302 fsnotify_destroy_event(group, kevent);
306 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
308 FANOTIFY_PE(kevent)->response = FAN_DENY;
309 wake_up(&group->fanotify_data.access_waitq);
312 spin_lock(&group->notification_lock);
313 list_add_tail(&kevent->list,
314 &group->fanotify_data.access_list);
315 spin_unlock(&group->notification_lock);
321 remove_wait_queue(&group->notification_waitq, &wait);
323 if (start != buf && ret != -EFAULT)
328 static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
330 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
331 struct fanotify_response response = { .fd = -1, .response = -1 };
332 struct fsnotify_group *group;
335 group = file->private_data;
337 if (count > sizeof(response))
338 count = sizeof(response);
340 pr_debug("%s: group=%p count=%zu\n", __func__, group, count);
342 if (copy_from_user(&response, buf, count))
345 ret = process_access_response(group, &response);
355 static int fanotify_release(struct inode *ignored, struct file *file)
357 struct fsnotify_group *group = file->private_data;
359 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
360 struct fanotify_perm_event_info *event, *next;
361 struct fsnotify_event *fsn_event;
364 * Stop new events from arriving in the notification queue. since
365 * userspace cannot use fanotify fd anymore, no event can enter or
366 * leave access_list by now either.
368 fsnotify_group_stop_queueing(group);
371 * Process all permission events on access_list and notification queue
372 * and simulate reply from userspace.
374 spin_lock(&group->notification_lock);
375 list_for_each_entry_safe(event, next, &group->fanotify_data.access_list,
377 pr_debug("%s: found group=%p event=%p\n", __func__, group,
380 list_del_init(&event->fae.fse.list);
381 event->response = FAN_ALLOW;
385 * Destroy all non-permission events. For permission events just
386 * dequeue them and set the response. They will be freed once the
387 * response is consumed and fanotify_get_response() returns.
389 while (!fsnotify_notify_queue_is_empty(group)) {
390 fsn_event = fsnotify_remove_first_event(group);
391 if (!(fsn_event->mask & FAN_ALL_PERM_EVENTS)) {
392 spin_unlock(&group->notification_lock);
393 fsnotify_destroy_event(group, fsn_event);
394 spin_lock(&group->notification_lock);
396 FANOTIFY_PE(fsn_event)->response = FAN_ALLOW;
398 spin_unlock(&group->notification_lock);
400 /* Response for all permission events it set, wakeup waiters */
401 wake_up(&group->fanotify_data.access_waitq);
404 /* matches the fanotify_init->fsnotify_alloc_group */
405 fsnotify_destroy_group(group);
410 static long fanotify_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
412 struct fsnotify_group *group;
413 struct fsnotify_event *fsn_event;
418 group = file->private_data;
420 p = (void __user *) arg;
424 spin_lock(&group->notification_lock);
425 list_for_each_entry(fsn_event, &group->notification_list, list)
426 send_len += FAN_EVENT_METADATA_LEN;
427 spin_unlock(&group->notification_lock);
428 ret = put_user(send_len, (int __user *) p);
435 static const struct file_operations fanotify_fops = {
436 .show_fdinfo = fanotify_show_fdinfo,
437 .poll = fanotify_poll,
438 .read = fanotify_read,
439 .write = fanotify_write,
441 .release = fanotify_release,
442 .unlocked_ioctl = fanotify_ioctl,
443 .compat_ioctl = fanotify_ioctl,
444 .llseek = noop_llseek,
447 static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
449 kmem_cache_free(fanotify_mark_cache, fsn_mark);
452 static int fanotify_find_path(int dfd, const char __user *filename,
453 struct path *path, unsigned int flags)
457 pr_debug("%s: dfd=%d filename=%p flags=%x\n", __func__,
458 dfd, filename, flags);
460 if (filename == NULL) {
461 struct fd f = fdget(dfd);
468 if ((flags & FAN_MARK_ONLYDIR) &&
469 !(S_ISDIR(file_inode(f.file)->i_mode))) {
474 *path = f.file->f_path;
478 unsigned int lookup_flags = 0;
480 if (!(flags & FAN_MARK_DONT_FOLLOW))
481 lookup_flags |= LOOKUP_FOLLOW;
482 if (flags & FAN_MARK_ONLYDIR)
483 lookup_flags |= LOOKUP_DIRECTORY;
485 ret = user_path_at(dfd, filename, lookup_flags, path);
490 /* you can only watch an inode if you have read permissions on it */
491 ret = inode_permission(path->dentry->d_inode, MAY_READ);
498 static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
505 spin_lock(&fsn_mark->lock);
506 if (!(flags & FAN_MARK_IGNORED_MASK)) {
507 __u32 tmask = fsn_mark->mask & ~mask;
509 if (flags & FAN_MARK_ONDIR)
512 oldmask = fsn_mark->mask;
513 fsnotify_set_mark_mask_locked(fsn_mark, tmask);
515 __u32 tmask = fsn_mark->ignored_mask & ~mask;
516 if (flags & FAN_MARK_ONDIR)
519 fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
521 *destroy = !(fsn_mark->mask | fsn_mark->ignored_mask);
522 spin_unlock(&fsn_mark->lock);
524 return mask & oldmask;
527 static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
528 struct vfsmount *mnt, __u32 mask,
531 struct fsnotify_mark *fsn_mark = NULL;
535 mutex_lock(&group->mark_mutex);
536 fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
538 mutex_unlock(&group->mark_mutex);
542 removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
545 fsnotify_detach_mark(fsn_mark);
546 mutex_unlock(&group->mark_mutex);
548 fsnotify_free_mark(fsn_mark);
550 fsnotify_put_mark(fsn_mark);
551 if (removed & real_mount(mnt)->mnt_fsnotify_mask)
552 fsnotify_recalc_vfsmount_mask(mnt);
557 static int fanotify_remove_inode_mark(struct fsnotify_group *group,
558 struct inode *inode, __u32 mask,
561 struct fsnotify_mark *fsn_mark = NULL;
565 mutex_lock(&group->mark_mutex);
566 fsn_mark = fsnotify_find_inode_mark(group, inode);
568 mutex_unlock(&group->mark_mutex);
572 removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
575 fsnotify_detach_mark(fsn_mark);
576 mutex_unlock(&group->mark_mutex);
578 fsnotify_free_mark(fsn_mark);
580 /* matches the fsnotify_find_inode_mark() */
581 fsnotify_put_mark(fsn_mark);
582 if (removed & inode->i_fsnotify_mask)
583 fsnotify_recalc_inode_mask(inode);
588 static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
594 spin_lock(&fsn_mark->lock);
595 if (!(flags & FAN_MARK_IGNORED_MASK)) {
596 __u32 tmask = fsn_mark->mask | mask;
598 if (flags & FAN_MARK_ONDIR)
601 oldmask = fsn_mark->mask;
602 fsnotify_set_mark_mask_locked(fsn_mark, tmask);
604 __u32 tmask = fsn_mark->ignored_mask | mask;
605 if (flags & FAN_MARK_ONDIR)
608 fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
609 if (flags & FAN_MARK_IGNORED_SURV_MODIFY)
610 fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY;
612 spin_unlock(&fsn_mark->lock);
614 return mask & ~oldmask;
617 static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
619 struct vfsmount *mnt)
621 struct fsnotify_mark *mark;
624 if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks)
625 return ERR_PTR(-ENOSPC);
627 mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
629 return ERR_PTR(-ENOMEM);
631 fsnotify_init_mark(mark, fanotify_free_mark);
632 ret = fsnotify_add_mark_locked(mark, group, inode, mnt, 0);
634 fsnotify_put_mark(mark);
642 static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
643 struct vfsmount *mnt, __u32 mask,
646 struct fsnotify_mark *fsn_mark;
649 mutex_lock(&group->mark_mutex);
650 fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
652 fsn_mark = fanotify_add_new_mark(group, NULL, mnt);
653 if (IS_ERR(fsn_mark)) {
654 mutex_unlock(&group->mark_mutex);
655 return PTR_ERR(fsn_mark);
658 added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
659 mutex_unlock(&group->mark_mutex);
661 if (added & ~real_mount(mnt)->mnt_fsnotify_mask)
662 fsnotify_recalc_vfsmount_mask(mnt);
664 fsnotify_put_mark(fsn_mark);
668 static int fanotify_add_inode_mark(struct fsnotify_group *group,
669 struct inode *inode, __u32 mask,
672 struct fsnotify_mark *fsn_mark;
675 pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
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.
682 if ((flags & FAN_MARK_IGNORED_MASK) &&
683 !(flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
684 (atomic_read(&inode->i_writecount) > 0))
687 mutex_lock(&group->mark_mutex);
688 fsn_mark = fsnotify_find_inode_mark(group, inode);
690 fsn_mark = fanotify_add_new_mark(group, inode, NULL);
691 if (IS_ERR(fsn_mark)) {
692 mutex_unlock(&group->mark_mutex);
693 return PTR_ERR(fsn_mark);
696 added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
697 mutex_unlock(&group->mark_mutex);
699 if (added & ~inode->i_fsnotify_mask)
700 fsnotify_recalc_inode_mask(inode);
702 fsnotify_put_mark(fsn_mark);
706 /* fanotify syscalls */
707 SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
709 struct fsnotify_group *group;
711 struct user_struct *user;
712 struct fanotify_event_info *oevent;
714 pr_debug("%s: flags=%d event_f_flags=%d\n",
715 __func__, flags, event_f_flags);
717 if (!capable(CAP_SYS_ADMIN))
720 if (flags & ~FAN_ALL_INIT_FLAGS)
723 if (event_f_flags & ~FANOTIFY_INIT_ALL_EVENT_F_BITS)
726 switch (event_f_flags & O_ACCMODE) {
735 user = get_current_user();
736 if (atomic_read(&user->fanotify_listeners) > FANOTIFY_DEFAULT_MAX_LISTENERS) {
741 f_flags = O_RDWR | FMODE_NONOTIFY;
742 if (flags & FAN_CLOEXEC)
743 f_flags |= O_CLOEXEC;
744 if (flags & FAN_NONBLOCK)
745 f_flags |= O_NONBLOCK;
747 /* fsnotify_alloc_group takes a ref. Dropped in fanotify_release */
748 group = fsnotify_alloc_group(&fanotify_fsnotify_ops);
751 return PTR_ERR(group);
754 group->fanotify_data.user = user;
755 atomic_inc(&user->fanotify_listeners);
757 oevent = fanotify_alloc_event(NULL, FS_Q_OVERFLOW, NULL);
758 if (unlikely(!oevent)) {
760 goto out_destroy_group;
762 group->overflow_event = &oevent->fse;
764 if (force_o_largefile())
765 event_f_flags |= O_LARGEFILE;
766 group->fanotify_data.f_flags = event_f_flags;
767 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
768 init_waitqueue_head(&group->fanotify_data.access_waitq);
769 INIT_LIST_HEAD(&group->fanotify_data.access_list);
771 switch (flags & FAN_ALL_CLASS_BITS) {
772 case FAN_CLASS_NOTIF:
773 group->priority = FS_PRIO_0;
775 case FAN_CLASS_CONTENT:
776 group->priority = FS_PRIO_1;
778 case FAN_CLASS_PRE_CONTENT:
779 group->priority = FS_PRIO_2;
783 goto out_destroy_group;
786 if (flags & FAN_UNLIMITED_QUEUE) {
788 if (!capable(CAP_SYS_ADMIN))
789 goto out_destroy_group;
790 group->max_events = UINT_MAX;
792 group->max_events = FANOTIFY_DEFAULT_MAX_EVENTS;
795 if (flags & FAN_UNLIMITED_MARKS) {
797 if (!capable(CAP_SYS_ADMIN))
798 goto out_destroy_group;
799 group->fanotify_data.max_marks = UINT_MAX;
801 group->fanotify_data.max_marks = FANOTIFY_DEFAULT_MAX_MARKS;
804 fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags);
806 goto out_destroy_group;
811 fsnotify_destroy_group(group);
815 SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags,
816 __u64, mask, int, dfd,
817 const char __user *, pathname)
819 struct inode *inode = NULL;
820 struct vfsmount *mnt = NULL;
821 struct fsnotify_group *group;
826 pr_debug("%s: fanotify_fd=%d flags=%x dfd=%d pathname=%p mask=%llx\n",
827 __func__, fanotify_fd, flags, dfd, pathname, mask);
829 /* we only use the lower 32 bits as of right now. */
830 if (mask & ((__u64)0xffffffff << 32))
833 if (flags & ~FAN_ALL_MARK_FLAGS)
835 switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) {
836 case FAN_MARK_ADD: /* fallthrough */
837 case FAN_MARK_REMOVE:
842 if (flags & ~(FAN_MARK_MOUNT | FAN_MARK_FLUSH))
849 if (mask & FAN_ONDIR) {
850 flags |= FAN_MARK_ONDIR;
854 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
855 if (mask & ~(FAN_ALL_EVENTS | FAN_ALL_PERM_EVENTS | FAN_EVENT_ON_CHILD))
857 if (mask & ~(FAN_ALL_EVENTS | FAN_EVENT_ON_CHILD))
861 f = fdget(fanotify_fd);
862 if (unlikely(!f.file))
865 /* verify that this is indeed an fanotify instance */
867 if (unlikely(f.file->f_op != &fanotify_fops))
869 group = f.file->private_data;
872 * group->priority == FS_PRIO_0 == FAN_CLASS_NOTIF. These are not
873 * allowed to set permissions events.
876 if (mask & FAN_ALL_PERM_EVENTS &&
877 group->priority == FS_PRIO_0)
880 if (flags & FAN_MARK_FLUSH) {
882 if (flags & FAN_MARK_MOUNT)
883 fsnotify_clear_vfsmount_marks_by_group(group);
885 fsnotify_clear_inode_marks_by_group(group);
889 ret = fanotify_find_path(dfd, pathname, &path, flags);
893 /* inode held in place by reference to path; group by fget on fd */
894 if (!(flags & FAN_MARK_MOUNT))
895 inode = path.dentry->d_inode;
899 /* create/update an inode mark */
900 switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) {
902 if (flags & FAN_MARK_MOUNT)
903 ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags);
905 ret = fanotify_add_inode_mark(group, inode, mask, flags);
907 case FAN_MARK_REMOVE:
908 if (flags & FAN_MARK_MOUNT)
909 ret = fanotify_remove_vfsmount_mark(group, mnt, mask, flags);
911 ret = fanotify_remove_inode_mark(group, inode, mask, flags);
924 COMPAT_SYSCALL_DEFINE6(fanotify_mark,
925 int, fanotify_fd, unsigned int, flags,
926 __u32, mask0, __u32, mask1, int, dfd,
927 const char __user *, pathname)
929 return sys_fanotify_mark(fanotify_fd, flags,
931 ((__u64)mask0 << 32) | mask1,
933 ((__u64)mask1 << 32) | mask0,
940 * fanotify_user_setup - Our initialization function. Note that we cannot return
941 * error because we have compiled-in VFS hooks. So an (unlikely) failure here
942 * must result in panic().
944 static int __init fanotify_user_setup(void)
946 fanotify_mark_cache = KMEM_CACHE(fsnotify_mark, SLAB_PANIC);
947 fanotify_event_cachep = KMEM_CACHE(fanotify_event_info, SLAB_PANIC);
948 #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
949 fanotify_perm_event_cachep = KMEM_CACHE(fanotify_perm_event_info,
955 device_initcall(fanotify_user_setup);