1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fanotify.h>
3 #include <linux/fdtable.h>
4 #include <linux/fsnotify_backend.h>
5 #include <linux/init.h>
6 #include <linux/jiffies.h>
7 #include <linux/kernel.h> /* UINT_MAX */
8 #include <linux/mount.h>
9 #include <linux/sched.h>
10 #include <linux/sched/user.h>
11 #include <linux/sched/signal.h>
12 #include <linux/types.h>
13 #include <linux/wait.h>
14 #include <linux/audit.h>
15 #include <linux/sched/mm.h>
16 #include <linux/statfs.h>
17 #include <linux/stringhash.h>
21 static bool fanotify_path_equal(struct path *p1, struct path *p2)
23 return p1->mnt == p2->mnt && p1->dentry == p2->dentry;
26 static unsigned int fanotify_hash_path(const struct path *path)
28 return hash_ptr(path->dentry, FANOTIFY_EVENT_HASH_BITS) ^
29 hash_ptr(path->mnt, FANOTIFY_EVENT_HASH_BITS);
32 static inline bool fanotify_fsid_equal(__kernel_fsid_t *fsid1,
33 __kernel_fsid_t *fsid2)
35 return fsid1->val[0] == fsid2->val[0] && fsid1->val[1] == fsid2->val[1];
38 static unsigned int fanotify_hash_fsid(__kernel_fsid_t *fsid)
40 return hash_32(fsid->val[0], FANOTIFY_EVENT_HASH_BITS) ^
41 hash_32(fsid->val[1], FANOTIFY_EVENT_HASH_BITS);
44 static bool fanotify_fh_equal(struct fanotify_fh *fh1,
45 struct fanotify_fh *fh2)
47 if (fh1->type != fh2->type || fh1->len != fh2->len)
51 !memcmp(fanotify_fh_buf(fh1), fanotify_fh_buf(fh2), fh1->len);
54 static unsigned int fanotify_hash_fh(struct fanotify_fh *fh)
56 long salt = (long)fh->type | (long)fh->len << 8;
59 * full_name_hash() works long by long, so it handles fh buf optimally.
61 return full_name_hash((void *)salt, fanotify_fh_buf(fh), fh->len);
64 static bool fanotify_fid_event_equal(struct fanotify_fid_event *ffe1,
65 struct fanotify_fid_event *ffe2)
67 /* Do not merge fid events without object fh */
68 if (!ffe1->object_fh.len)
71 return fanotify_fsid_equal(&ffe1->fsid, &ffe2->fsid) &&
72 fanotify_fh_equal(&ffe1->object_fh, &ffe2->object_fh);
75 static bool fanotify_info_equal(struct fanotify_info *info1,
76 struct fanotify_info *info2)
78 if (info1->dir_fh_totlen != info2->dir_fh_totlen ||
79 info1->file_fh_totlen != info2->file_fh_totlen ||
80 info1->name_len != info2->name_len)
83 if (info1->dir_fh_totlen &&
84 !fanotify_fh_equal(fanotify_info_dir_fh(info1),
85 fanotify_info_dir_fh(info2)))
88 if (info1->file_fh_totlen &&
89 !fanotify_fh_equal(fanotify_info_file_fh(info1),
90 fanotify_info_file_fh(info2)))
93 return !info1->name_len ||
94 !memcmp(fanotify_info_name(info1), fanotify_info_name(info2),
98 static bool fanotify_name_event_equal(struct fanotify_name_event *fne1,
99 struct fanotify_name_event *fne2)
101 struct fanotify_info *info1 = &fne1->info;
102 struct fanotify_info *info2 = &fne2->info;
104 /* Do not merge name events without dir fh */
105 if (!info1->dir_fh_totlen)
108 if (!fanotify_fsid_equal(&fne1->fsid, &fne2->fsid))
111 return fanotify_info_equal(info1, info2);
114 static bool fanotify_should_merge(struct fanotify_event *old,
115 struct fanotify_event *new)
117 pr_debug("%s: old=%p new=%p\n", __func__, old, new);
119 if (old->hash != new->hash ||
120 old->type != new->type || old->pid != new->pid)
124 * We want to merge many dirent events in the same dir (i.e.
125 * creates/unlinks/renames), but we do not want to merge dirent
126 * events referring to subdirs with dirent events referring to
127 * non subdirs, otherwise, user won't be able to tell from a
128 * mask FAN_CREATE|FAN_DELETE|FAN_ONDIR if it describes mkdir+
129 * unlink pair or rmdir+create pair of events.
131 if ((old->mask & FS_ISDIR) != (new->mask & FS_ISDIR))
135 case FANOTIFY_EVENT_TYPE_PATH:
136 return fanotify_path_equal(fanotify_event_path(old),
137 fanotify_event_path(new));
138 case FANOTIFY_EVENT_TYPE_FID:
139 return fanotify_fid_event_equal(FANOTIFY_FE(old),
141 case FANOTIFY_EVENT_TYPE_FID_NAME:
142 return fanotify_name_event_equal(FANOTIFY_NE(old),
151 /* Limit event merges to limit CPU overhead per event */
152 #define FANOTIFY_MAX_MERGE_EVENTS 128
154 /* and the list better be locked by something too! */
155 static int fanotify_merge(struct fsnotify_group *group,
156 struct fsnotify_event *event)
158 struct fanotify_event *old, *new = FANOTIFY_E(event);
159 unsigned int bucket = fanotify_event_hash_bucket(group, new);
160 struct hlist_head *hlist = &group->fanotify_data.merge_hash[bucket];
163 pr_debug("%s: group=%p event=%p bucket=%u\n", __func__,
164 group, event, bucket);
167 * Don't merge a permission event with any other event so that we know
168 * the event structure we have created in fanotify_handle_event() is the
169 * one we should check for permission response.
171 if (fanotify_is_perm_event(new->mask))
174 hlist_for_each_entry(old, hlist, merge_list) {
175 if (++i > FANOTIFY_MAX_MERGE_EVENTS)
177 if (fanotify_should_merge(old, new)) {
178 old->mask |= new->mask;
187 * Wait for response to permission event. The function also takes care of
188 * freeing the permission event (or offloads that in case the wait is canceled
189 * by a signal). The function returns 0 in case access got allowed by userspace,
190 * -EPERM in case userspace disallowed the access, and -ERESTARTSYS in case
191 * the wait got interrupted by a signal.
193 static int fanotify_get_response(struct fsnotify_group *group,
194 struct fanotify_perm_event *event,
195 struct fsnotify_iter_info *iter_info)
199 pr_debug("%s: group=%p event=%p\n", __func__, group, event);
201 ret = wait_event_killable(group->fanotify_data.access_waitq,
202 event->state == FAN_EVENT_ANSWERED);
203 /* Signal pending? */
205 spin_lock(&group->notification_lock);
206 /* Event reported to userspace and no answer yet? */
207 if (event->state == FAN_EVENT_REPORTED) {
208 /* Event will get freed once userspace answers to it */
209 event->state = FAN_EVENT_CANCELED;
210 spin_unlock(&group->notification_lock);
213 /* Event not yet reported? Just remove it. */
214 if (event->state == FAN_EVENT_INIT) {
215 fsnotify_remove_queued_event(group, &event->fae.fse);
216 /* Permission events are not supposed to be hashed */
217 WARN_ON_ONCE(!hlist_unhashed(&event->fae.merge_list));
220 * Event may be also answered in case signal delivery raced
221 * with wakeup. In that case we have nothing to do besides
222 * freeing the event and reporting error.
224 spin_unlock(&group->notification_lock);
228 /* userspace responded, convert to something usable */
229 switch (event->response & ~FAN_AUDIT) {
238 /* Check if the response should be audited */
239 if (event->response & FAN_AUDIT)
240 audit_fanotify(event->response & ~FAN_AUDIT);
242 pr_debug("%s: group=%p event=%p about to return ret=%d\n", __func__,
245 fsnotify_destroy_event(group, &event->fae.fse);
251 * This function returns a mask for an event that only contains the flags
252 * that have been specifically requested by the user. Flags that may have
253 * been included within the event mask, but have not been explicitly
254 * requested by the user, will not be present in the returned mask.
256 static u32 fanotify_group_event_mask(struct fsnotify_group *group,
257 struct fsnotify_iter_info *iter_info,
258 u32 event_mask, const void *data,
259 int data_type, struct inode *dir)
261 __u32 marks_mask = 0, marks_ignored_mask = 0;
262 __u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS |
263 FANOTIFY_EVENT_FLAGS;
264 const struct path *path = fsnotify_data_path(data, data_type);
265 unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
266 struct fsnotify_mark *mark;
269 pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n",
270 __func__, iter_info->report_mask, event_mask, data, data_type);
273 /* Do we have path to open a file descriptor? */
276 /* Path type events are only relevant for files and dirs */
277 if (!d_is_reg(path->dentry) && !d_can_lookup(path->dentry))
279 } else if (!(fid_mode & FAN_REPORT_FID)) {
280 /* Do we have a directory inode to report? */
281 if (!dir && !(event_mask & FS_ISDIR))
285 fsnotify_foreach_obj_type(type) {
286 if (!fsnotify_iter_should_report_type(iter_info, type))
288 mark = iter_info->marks[type];
290 /* Apply ignore mask regardless of ISDIR and ON_CHILD flags */
291 marks_ignored_mask |= mark->ignored_mask;
294 * If the event is on dir and this mark doesn't care about
295 * events on dir, don't send it!
297 if (event_mask & FS_ISDIR && !(mark->mask & FS_ISDIR))
301 * If the event is on a child and this mark is on a parent not
302 * watching children, don't send it!
304 if (type == FSNOTIFY_OBJ_TYPE_PARENT &&
305 !(mark->mask & FS_EVENT_ON_CHILD))
308 marks_mask |= mark->mask;
311 test_mask = event_mask & marks_mask & ~marks_ignored_mask;
314 * For dirent modification events (create/delete/move) that do not carry
315 * the child entry name information, we report FAN_ONDIR for mkdir/rmdir
316 * so user can differentiate them from creat/unlink.
318 * For backward compatibility and consistency, do not report FAN_ONDIR
319 * to user in legacy fanotify mode (reporting fd) and report FAN_ONDIR
320 * to user in fid mode for all event types.
322 * We never report FAN_EVENT_ON_CHILD to user, but we do pass it in to
323 * fanotify_alloc_event() when group is reporting fid as indication
324 * that event happened on child.
327 /* Do not report event flags without any event */
328 if (!(test_mask & ~FANOTIFY_EVENT_FLAGS))
331 user_mask &= ~FANOTIFY_EVENT_FLAGS;
334 return test_mask & user_mask;
338 * Check size needed to encode fanotify_fh.
340 * Return size of encoded fh without fanotify_fh header.
341 * Return 0 on failure to encode.
343 static int fanotify_encode_fh_len(struct inode *inode)
350 exportfs_encode_inode_fh(inode, NULL, &dwords, NULL);
356 * Encode fanotify_fh.
358 * Return total size of encoded fh including fanotify_fh header.
359 * Return 0 on failure to encode.
361 static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode,
362 unsigned int fh_len, unsigned int *hash,
365 int dwords, type = 0;
366 char *ext_buf = NULL;
370 fh->type = FILEID_ROOT;
377 * !gpf means preallocated variable size fh, but fh_len could
378 * be zero in that case if encoding fh len failed.
381 if (fh_len < 4 || WARN_ON_ONCE(fh_len % 4))
384 /* No external buffer in a variable size allocated fh */
385 if (gfp && fh_len > FANOTIFY_INLINE_FH_LEN) {
386 /* Treat failure to allocate fh as failure to encode fh */
388 ext_buf = kmalloc(fh_len, gfp);
392 *fanotify_fh_ext_buf_ptr(fh) = ext_buf;
394 fh->flags |= FANOTIFY_FH_FLAG_EXT_BUF;
397 dwords = fh_len >> 2;
398 type = exportfs_encode_inode_fh(inode, buf, &dwords, NULL);
400 if (!type || type == FILEID_INVALID || fh_len != dwords << 2)
406 /* Mix fh into event merge key */
407 *hash ^= fanotify_hash_fh(fh);
409 return FANOTIFY_FH_HDR_LEN + fh_len;
412 pr_warn_ratelimited("fanotify: failed to encode fid (type=%d, len=%d, err=%i)\n",
415 *fanotify_fh_ext_buf_ptr(fh) = NULL;
416 /* Report the event without a file identifier on encode error */
417 fh->type = FILEID_INVALID;
423 * The inode to use as identifier when reporting fid depends on the event.
424 * Report the modified directory inode on dirent modification events.
425 * Report the "victim" inode otherwise.
427 * FS_ATTRIB reports the child inode even if reported on a watched parent.
428 * FS_CREATE reports the modified dir inode and not the created inode.
430 static struct inode *fanotify_fid_inode(u32 event_mask, const void *data,
431 int data_type, struct inode *dir)
433 if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
436 return fsnotify_data_inode(data, data_type);
440 * The inode to use as identifier when reporting dir fid depends on the event.
441 * Report the modified directory inode on dirent modification events.
442 * Report the "victim" inode if "victim" is a directory.
443 * Report the parent inode if "victim" is not a directory and event is
444 * reported to parent.
445 * Otherwise, do not report dir fid.
447 static struct inode *fanotify_dfid_inode(u32 event_mask, const void *data,
448 int data_type, struct inode *dir)
450 struct inode *inode = fsnotify_data_inode(data, data_type);
452 if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
455 if (S_ISDIR(inode->i_mode))
461 static struct fanotify_event *fanotify_alloc_path_event(const struct path *path,
465 struct fanotify_path_event *pevent;
467 pevent = kmem_cache_alloc(fanotify_path_event_cachep, gfp);
471 pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH;
472 pevent->path = *path;
473 *hash ^= fanotify_hash_path(path);
479 static struct fanotify_event *fanotify_alloc_perm_event(const struct path *path,
482 struct fanotify_perm_event *pevent;
484 pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
488 pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH_PERM;
489 pevent->response = 0;
490 pevent->state = FAN_EVENT_INIT;
491 pevent->path = *path;
497 static struct fanotify_event *fanotify_alloc_fid_event(struct inode *id,
498 __kernel_fsid_t *fsid,
502 struct fanotify_fid_event *ffe;
504 ffe = kmem_cache_alloc(fanotify_fid_event_cachep, gfp);
508 ffe->fae.type = FANOTIFY_EVENT_TYPE_FID;
510 *hash ^= fanotify_hash_fsid(fsid);
511 fanotify_encode_fh(&ffe->object_fh, id, fanotify_encode_fh_len(id),
517 static struct fanotify_event *fanotify_alloc_name_event(struct inode *id,
518 __kernel_fsid_t *fsid,
519 const struct qstr *name,
524 struct fanotify_name_event *fne;
525 struct fanotify_info *info;
526 struct fanotify_fh *dfh, *ffh;
527 unsigned int dir_fh_len = fanotify_encode_fh_len(id);
528 unsigned int child_fh_len = fanotify_encode_fh_len(child);
531 size = sizeof(*fne) + FANOTIFY_FH_HDR_LEN + dir_fh_len;
533 size += FANOTIFY_FH_HDR_LEN + child_fh_len;
535 size += name->len + 1;
536 fne = kmalloc(size, gfp);
540 fne->fae.type = FANOTIFY_EVENT_TYPE_FID_NAME;
542 *hash ^= fanotify_hash_fsid(fsid);
544 fanotify_info_init(info);
545 dfh = fanotify_info_dir_fh(info);
546 info->dir_fh_totlen = fanotify_encode_fh(dfh, id, dir_fh_len, hash, 0);
548 ffh = fanotify_info_file_fh(info);
549 info->file_fh_totlen = fanotify_encode_fh(ffh, child,
550 child_fh_len, hash, 0);
553 long salt = name->len;
555 fanotify_info_copy_name(info, name);
556 *hash ^= full_name_hash((void *)salt, name->name, name->len);
559 pr_debug("%s: ino=%lu size=%u dir_fh_len=%u child_fh_len=%u name_len=%u name='%.*s'\n",
560 __func__, id->i_ino, size, dir_fh_len, child_fh_len,
561 info->name_len, info->name_len, fanotify_info_name(info));
566 static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
567 u32 mask, const void *data,
568 int data_type, struct inode *dir,
569 const struct qstr *file_name,
570 __kernel_fsid_t *fsid)
572 struct fanotify_event *event = NULL;
573 gfp_t gfp = GFP_KERNEL_ACCOUNT;
574 struct inode *id = fanotify_fid_inode(mask, data, data_type, dir);
575 struct inode *dirid = fanotify_dfid_inode(mask, data, data_type, dir);
576 const struct path *path = fsnotify_data_path(data, data_type);
577 unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
578 struct mem_cgroup *old_memcg;
579 struct inode *child = NULL;
580 bool name_event = false;
581 unsigned int hash = 0;
582 bool ondir = mask & FAN_ONDIR;
585 if ((fid_mode & FAN_REPORT_DIR_FID) && dirid) {
587 * With both flags FAN_REPORT_DIR_FID and FAN_REPORT_FID, we
588 * report the child fid for events reported on a non-dir child
589 * in addition to reporting the parent fid and maybe child name.
591 if ((fid_mode & FAN_REPORT_FID) && id != dirid && !ondir)
597 * We record file name only in a group with FAN_REPORT_NAME
598 * and when we have a directory inode to report.
600 * For directory entry modification event, we record the fid of
601 * the directory and the name of the modified entry.
603 * For event on non-directory that is reported to parent, we
604 * record the fid of the parent and the name of the child.
606 * Even if not reporting name, we need a variable length
607 * fanotify_name_event if reporting both parent and child fids.
609 if (!(fid_mode & FAN_REPORT_NAME)) {
610 name_event = !!child;
612 } else if ((mask & ALL_FSNOTIFY_DIRENT_EVENTS) || !ondir) {
618 * For queues with unlimited length lost events are not expected and
619 * can possibly have security implications. Avoid losing events when
620 * memory is short. For the limited size queues, avoid OOM killer in the
621 * target monitoring memcg as it may have security repercussion.
623 if (group->max_events == UINT_MAX)
626 gfp |= __GFP_RETRY_MAYFAIL;
628 /* Whoever is interested in the event, pays for the allocation. */
629 old_memcg = set_active_memcg(group->memcg);
631 if (fanotify_is_perm_event(mask)) {
632 event = fanotify_alloc_perm_event(path, gfp);
633 } else if (name_event && (file_name || child)) {
634 event = fanotify_alloc_name_event(id, fsid, file_name, child,
636 } else if (fid_mode) {
637 event = fanotify_alloc_fid_event(id, fsid, &hash, gfp);
639 event = fanotify_alloc_path_event(path, &hash, gfp);
645 if (FAN_GROUP_FLAG(group, FAN_REPORT_TID))
646 pid = get_pid(task_pid(current));
648 pid = get_pid(task_tgid(current));
650 /* Mix event info, FAN_ONDIR flag and pid into event merge key */
651 hash ^= hash_long((unsigned long)pid | ondir, FANOTIFY_EVENT_HASH_BITS);
652 fanotify_init_event(event, hash, mask);
656 set_active_memcg(old_memcg);
661 * Get cached fsid of the filesystem containing the object from any connector.
662 * All connectors are supposed to have the same fsid, but we do not verify that
665 static __kernel_fsid_t fanotify_get_fsid(struct fsnotify_iter_info *iter_info)
668 __kernel_fsid_t fsid = {};
670 fsnotify_foreach_obj_type(type) {
671 struct fsnotify_mark_connector *conn;
673 if (!fsnotify_iter_should_report_type(iter_info, type))
676 conn = READ_ONCE(iter_info->marks[type]->connector);
677 /* Mark is just getting destroyed or created? */
680 if (!(conn->flags & FSNOTIFY_CONN_FLAG_HAS_FSID))
682 /* Pairs with smp_wmb() in fsnotify_add_mark_list() */
685 if (WARN_ON_ONCE(!fsid.val[0] && !fsid.val[1]))
694 * Add an event to hash table for faster merge.
696 static void fanotify_insert_event(struct fsnotify_group *group,
697 struct fsnotify_event *fsn_event)
699 struct fanotify_event *event = FANOTIFY_E(fsn_event);
700 unsigned int bucket = fanotify_event_hash_bucket(group, event);
701 struct hlist_head *hlist = &group->fanotify_data.merge_hash[bucket];
703 assert_spin_locked(&group->notification_lock);
705 pr_debug("%s: group=%p event=%p bucket=%u\n", __func__,
706 group, event, bucket);
708 hlist_add_head(&event->merge_list, hlist);
711 static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
712 const void *data, int data_type,
714 const struct qstr *file_name, u32 cookie,
715 struct fsnotify_iter_info *iter_info)
718 struct fanotify_event *event;
719 struct fsnotify_event *fsn_event;
720 __kernel_fsid_t fsid = {};
722 BUILD_BUG_ON(FAN_ACCESS != FS_ACCESS);
723 BUILD_BUG_ON(FAN_MODIFY != FS_MODIFY);
724 BUILD_BUG_ON(FAN_ATTRIB != FS_ATTRIB);
725 BUILD_BUG_ON(FAN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE);
726 BUILD_BUG_ON(FAN_CLOSE_WRITE != FS_CLOSE_WRITE);
727 BUILD_BUG_ON(FAN_OPEN != FS_OPEN);
728 BUILD_BUG_ON(FAN_MOVED_TO != FS_MOVED_TO);
729 BUILD_BUG_ON(FAN_MOVED_FROM != FS_MOVED_FROM);
730 BUILD_BUG_ON(FAN_CREATE != FS_CREATE);
731 BUILD_BUG_ON(FAN_DELETE != FS_DELETE);
732 BUILD_BUG_ON(FAN_DELETE_SELF != FS_DELETE_SELF);
733 BUILD_BUG_ON(FAN_MOVE_SELF != FS_MOVE_SELF);
734 BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD);
735 BUILD_BUG_ON(FAN_Q_OVERFLOW != FS_Q_OVERFLOW);
736 BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
737 BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
738 BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
739 BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
740 BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
742 BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
744 mask = fanotify_group_event_mask(group, iter_info, mask, data,
749 pr_debug("%s: group=%p mask=%x\n", __func__, group, mask);
751 if (fanotify_is_perm_event(mask)) {
753 * fsnotify_prepare_user_wait() fails if we race with mark
754 * deletion. Just let the operation pass in that case.
756 if (!fsnotify_prepare_user_wait(iter_info))
760 if (FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS)) {
761 fsid = fanotify_get_fsid(iter_info);
762 /* Racing with mark destruction or creation? */
763 if (!fsid.val[0] && !fsid.val[1])
767 event = fanotify_alloc_event(group, mask, data, data_type, dir,
770 if (unlikely(!event)) {
772 * We don't queue overflow events for permission events as
773 * there the access is denied and so no event is in fact lost.
775 if (!fanotify_is_perm_event(mask))
776 fsnotify_queue_overflow(group);
780 fsn_event = &event->fse;
781 ret = fsnotify_add_event(group, fsn_event, fanotify_merge,
782 fanotify_is_hashed_event(mask) ?
783 fanotify_insert_event : NULL);
785 /* Permission events shouldn't be merged */
786 BUG_ON(ret == 1 && mask & FANOTIFY_PERM_EVENTS);
787 /* Our event wasn't used in the end. Free it. */
788 fsnotify_destroy_event(group, fsn_event);
791 } else if (fanotify_is_perm_event(mask)) {
792 ret = fanotify_get_response(group, FANOTIFY_PERM(event),
796 if (fanotify_is_perm_event(mask))
797 fsnotify_finish_user_wait(iter_info);
802 static void fanotify_free_group_priv(struct fsnotify_group *group)
804 kfree(group->fanotify_data.merge_hash);
805 if (group->fanotify_data.ucounts)
806 dec_ucount(group->fanotify_data.ucounts,
807 UCOUNT_FANOTIFY_GROUPS);
810 static void fanotify_free_path_event(struct fanotify_event *event)
812 path_put(fanotify_event_path(event));
813 kmem_cache_free(fanotify_path_event_cachep, FANOTIFY_PE(event));
816 static void fanotify_free_perm_event(struct fanotify_event *event)
818 path_put(fanotify_event_path(event));
819 kmem_cache_free(fanotify_perm_event_cachep, FANOTIFY_PERM(event));
822 static void fanotify_free_fid_event(struct fanotify_event *event)
824 struct fanotify_fid_event *ffe = FANOTIFY_FE(event);
826 if (fanotify_fh_has_ext_buf(&ffe->object_fh))
827 kfree(fanotify_fh_ext_buf(&ffe->object_fh));
828 kmem_cache_free(fanotify_fid_event_cachep, ffe);
831 static void fanotify_free_name_event(struct fanotify_event *event)
833 kfree(FANOTIFY_NE(event));
836 static void fanotify_free_event(struct fsnotify_event *fsn_event)
838 struct fanotify_event *event;
840 event = FANOTIFY_E(fsn_event);
842 switch (event->type) {
843 case FANOTIFY_EVENT_TYPE_PATH:
844 fanotify_free_path_event(event);
846 case FANOTIFY_EVENT_TYPE_PATH_PERM:
847 fanotify_free_perm_event(event);
849 case FANOTIFY_EVENT_TYPE_FID:
850 fanotify_free_fid_event(event);
852 case FANOTIFY_EVENT_TYPE_FID_NAME:
853 fanotify_free_name_event(event);
855 case FANOTIFY_EVENT_TYPE_OVERFLOW:
863 static void fanotify_freeing_mark(struct fsnotify_mark *mark,
864 struct fsnotify_group *group)
866 if (!FAN_GROUP_FLAG(group, FAN_UNLIMITED_MARKS))
867 dec_ucount(group->fanotify_data.ucounts, UCOUNT_FANOTIFY_MARKS);
870 static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
872 kmem_cache_free(fanotify_mark_cache, fsn_mark);
875 const struct fsnotify_ops fanotify_fsnotify_ops = {
876 .handle_event = fanotify_handle_event,
877 .free_group_priv = fanotify_free_group_priv,
878 .free_event = fanotify_free_event,
879 .freeing_mark = fanotify_freeing_mark,
880 .free_mark = fanotify_free_mark,