// SPDX-License-Identifier: GPL-2.0 #include #include #include #include #include #include /* UINT_MAX */ #include #include #include #include #include #include #include #include #include #include #include "fanotify.h" static bool fanotify_path_equal(const struct path *p1, const struct path *p2) { return p1->mnt == p2->mnt && p1->dentry == p2->dentry; } static unsigned int fanotify_hash_path(const struct path *path) { return hash_ptr(path->dentry, FANOTIFY_EVENT_HASH_BITS) ^ hash_ptr(path->mnt, FANOTIFY_EVENT_HASH_BITS); } static inline bool fanotify_fsid_equal(__kernel_fsid_t *fsid1, __kernel_fsid_t *fsid2) { return fsid1->val[0] == fsid2->val[0] && fsid1->val[1] == fsid2->val[1]; } static unsigned int fanotify_hash_fsid(__kernel_fsid_t *fsid) { return hash_32(fsid->val[0], FANOTIFY_EVENT_HASH_BITS) ^ hash_32(fsid->val[1], FANOTIFY_EVENT_HASH_BITS); } static bool fanotify_fh_equal(struct fanotify_fh *fh1, struct fanotify_fh *fh2) { if (fh1->type != fh2->type || fh1->len != fh2->len) return false; return !fh1->len || !memcmp(fanotify_fh_buf(fh1), fanotify_fh_buf(fh2), fh1->len); } static unsigned int fanotify_hash_fh(struct fanotify_fh *fh) { long salt = (long)fh->type | (long)fh->len << 8; /* * full_name_hash() works long by long, so it handles fh buf optimally. */ return full_name_hash((void *)salt, fanotify_fh_buf(fh), fh->len); } static bool fanotify_fid_event_equal(struct fanotify_fid_event *ffe1, struct fanotify_fid_event *ffe2) { /* Do not merge fid events without object fh */ if (!ffe1->object_fh.len) return false; return fanotify_fsid_equal(&ffe1->fsid, &ffe2->fsid) && fanotify_fh_equal(&ffe1->object_fh, &ffe2->object_fh); } static bool fanotify_info_equal(struct fanotify_info *info1, struct fanotify_info *info2) { if (info1->dir_fh_totlen != info2->dir_fh_totlen || info1->dir2_fh_totlen != info2->dir2_fh_totlen || info1->file_fh_totlen != info2->file_fh_totlen || info1->name_len != info2->name_len || info1->name2_len != info2->name2_len) return false; if (info1->dir_fh_totlen && !fanotify_fh_equal(fanotify_info_dir_fh(info1), fanotify_info_dir_fh(info2))) return false; if (info1->dir2_fh_totlen && !fanotify_fh_equal(fanotify_info_dir2_fh(info1), fanotify_info_dir2_fh(info2))) return false; if (info1->file_fh_totlen && !fanotify_fh_equal(fanotify_info_file_fh(info1), fanotify_info_file_fh(info2))) return false; if (info1->name_len && memcmp(fanotify_info_name(info1), fanotify_info_name(info2), info1->name_len)) return false; return !info1->name2_len || !memcmp(fanotify_info_name2(info1), fanotify_info_name2(info2), info1->name2_len); } static bool fanotify_name_event_equal(struct fanotify_name_event *fne1, struct fanotify_name_event *fne2) { struct fanotify_info *info1 = &fne1->info; struct fanotify_info *info2 = &fne2->info; /* Do not merge name events without dir fh */ if (!info1->dir_fh_totlen) return false; if (!fanotify_fsid_equal(&fne1->fsid, &fne2->fsid)) return false; return fanotify_info_equal(info1, info2); } static bool fanotify_error_event_equal(struct fanotify_error_event *fee1, struct fanotify_error_event *fee2) { /* Error events against the same file system are always merged. */ if (!fanotify_fsid_equal(&fee1->fsid, &fee2->fsid)) return false; return true; } static bool fanotify_should_merge(struct fanotify_event *old, struct fanotify_event *new) { pr_debug("%s: old=%p new=%p\n", __func__, old, new); if (old->hash != new->hash || old->type != new->type || old->pid != new->pid) return false; /* * We want to merge many dirent events in the same dir (i.e. * creates/unlinks/renames), but we do not want to merge dirent * events referring to subdirs with dirent events referring to * non subdirs, otherwise, user won't be able to tell from a * mask FAN_CREATE|FAN_DELETE|FAN_ONDIR if it describes mkdir+ * unlink pair or rmdir+create pair of events. */ if ((old->mask & FS_ISDIR) != (new->mask & FS_ISDIR)) return false; /* * FAN_RENAME event is reported with special info record types, * so we cannot merge it with other events. */ if ((old->mask & FAN_RENAME) != (new->mask & FAN_RENAME)) return false; switch (old->type) { case FANOTIFY_EVENT_TYPE_PATH: return fanotify_path_equal(fanotify_event_path(old), fanotify_event_path(new)); case FANOTIFY_EVENT_TYPE_FID: return fanotify_fid_event_equal(FANOTIFY_FE(old), FANOTIFY_FE(new)); case FANOTIFY_EVENT_TYPE_FID_NAME: return fanotify_name_event_equal(FANOTIFY_NE(old), FANOTIFY_NE(new)); case FANOTIFY_EVENT_TYPE_FS_ERROR: return fanotify_error_event_equal(FANOTIFY_EE(old), FANOTIFY_EE(new)); default: WARN_ON_ONCE(1); } return false; } /* Limit event merges to limit CPU overhead per event */ #define FANOTIFY_MAX_MERGE_EVENTS 128 /* and the list better be locked by something too! */ static int fanotify_merge(struct fsnotify_group *group, struct fsnotify_event *event) { struct fanotify_event *old, *new = FANOTIFY_E(event); unsigned int bucket = fanotify_event_hash_bucket(group, new); struct hlist_head *hlist = &group->fanotify_data.merge_hash[bucket]; int i = 0; pr_debug("%s: group=%p event=%p bucket=%u\n", __func__, group, event, bucket); /* * Don't merge a permission event with any other event so that we know * the event structure we have created in fanotify_handle_event() is the * one we should check for permission response. */ if (fanotify_is_perm_event(new->mask)) return 0; hlist_for_each_entry(old, hlist, merge_list) { if (++i > FANOTIFY_MAX_MERGE_EVENTS) break; if (fanotify_should_merge(old, new)) { old->mask |= new->mask; if (fanotify_is_error_event(old->mask)) FANOTIFY_EE(old)->err_count++; return 1; } } return 0; } /* * Wait for response to permission event. The function also takes care of * freeing the permission event (or offloads that in case the wait is canceled * by a signal). The function returns 0 in case access got allowed by userspace, * -EPERM in case userspace disallowed the access, and -ERESTARTSYS in case * the wait got interrupted by a signal. */ static int fanotify_get_response(struct fsnotify_group *group, struct fanotify_perm_event *event, struct fsnotify_iter_info *iter_info) { int ret; pr_debug("%s: group=%p event=%p\n", __func__, group, event); ret = wait_event_killable(group->fanotify_data.access_waitq, event->state == FAN_EVENT_ANSWERED); /* Signal pending? */ if (ret < 0) { spin_lock(&group->notification_lock); /* Event reported to userspace and no answer yet? */ if (event->state == FAN_EVENT_REPORTED) { /* Event will get freed once userspace answers to it */ event->state = FAN_EVENT_CANCELED; spin_unlock(&group->notification_lock); return ret; } /* Event not yet reported? Just remove it. */ if (event->state == FAN_EVENT_INIT) { fsnotify_remove_queued_event(group, &event->fae.fse); /* Permission events are not supposed to be hashed */ WARN_ON_ONCE(!hlist_unhashed(&event->fae.merge_list)); } /* * Event may be also answered in case signal delivery raced * with wakeup. In that case we have nothing to do besides * freeing the event and reporting error. */ spin_unlock(&group->notification_lock); goto out; } /* userspace responded, convert to something usable */ switch (event->response & ~FAN_AUDIT) { case FAN_ALLOW: ret = 0; break; case FAN_DENY: default: ret = -EPERM; } /* Check if the response should be audited */ if (event->response & FAN_AUDIT) audit_fanotify(event->response & ~FAN_AUDIT); pr_debug("%s: group=%p event=%p about to return ret=%d\n", __func__, group, event, ret); out: fsnotify_destroy_event(group, &event->fae.fse); return ret; } /* * This function returns a mask for an event that only contains the flags * that have been specifically requested by the user. Flags that may have * been included within the event mask, but have not been explicitly * requested by the user, will not be present in the returned mask. */ static u32 fanotify_group_event_mask(struct fsnotify_group *group, struct fsnotify_iter_info *iter_info, u32 *match_mask, u32 event_mask, const void *data, int data_type, struct inode *dir) { __u32 marks_mask = 0, marks_ignore_mask = 0; __u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS | FANOTIFY_EVENT_FLAGS; const struct path *path = fsnotify_data_path(data, data_type); unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS); struct fsnotify_mark *mark; bool ondir = event_mask & FAN_ONDIR; int type; pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n", __func__, iter_info->report_mask, event_mask, data, data_type); if (!fid_mode) { /* Do we have path to open a file descriptor? */ if (!path) return 0; /* Path type events are only relevant for files and dirs */ if (!d_is_reg(path->dentry) && !d_can_lookup(path->dentry)) return 0; } else if (!(fid_mode & FAN_REPORT_FID)) { /* Do we have a directory inode to report? */ if (!dir && !ondir) return 0; } fsnotify_foreach_iter_mark_type(iter_info, mark, type) { /* * Apply ignore mask depending on event flags in ignore mask. */ marks_ignore_mask |= fsnotify_effective_ignore_mask(mark, ondir, type); /* * Send the event depending on event flags in mark mask. */ if (!fsnotify_mask_applicable(mark->mask, ondir, type)) continue; marks_mask |= mark->mask; /* Record the mark types of this group that matched the event */ *match_mask |= 1U << type; } test_mask = event_mask & marks_mask & ~marks_ignore_mask; /* * For dirent modification events (create/delete/move) that do not carry * the child entry name information, we report FAN_ONDIR for mkdir/rmdir * so user can differentiate them from creat/unlink. * * For backward compatibility and consistency, do not report FAN_ONDIR * to user in legacy fanotify mode (reporting fd) and report FAN_ONDIR * to user in fid mode for all event types. * * We never report FAN_EVENT_ON_CHILD to user, but we do pass it in to * fanotify_alloc_event() when group is reporting fid as indication * that event happened on child. */ if (fid_mode) { /* Do not report event flags without any event */ if (!(test_mask & ~FANOTIFY_EVENT_FLAGS)) return 0; } else { user_mask &= ~FANOTIFY_EVENT_FLAGS; } return test_mask & user_mask; } /* * Check size needed to encode fanotify_fh. * * Return size of encoded fh without fanotify_fh header. * Return 0 on failure to encode. */ static int fanotify_encode_fh_len(struct inode *inode) { int dwords = 0; int fh_len; if (!inode) return 0; exportfs_encode_inode_fh(inode, NULL, &dwords, NULL); fh_len = dwords << 2; /* * struct fanotify_error_event might be preallocated and is * limited to MAX_HANDLE_SZ. This should never happen, but * safeguard by forcing an invalid file handle. */ if (WARN_ON_ONCE(fh_len > MAX_HANDLE_SZ)) return 0; return fh_len; } /* * Encode fanotify_fh. * * Return total size of encoded fh including fanotify_fh header. * Return 0 on failure to encode. */ static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode, unsigned int fh_len, unsigned int *hash, gfp_t gfp) { int dwords, type = 0; char *ext_buf = NULL; void *buf = fh->buf; int err; fh->type = FILEID_ROOT; fh->len = 0; fh->flags = 0; /* * Invalid FHs are used by FAN_FS_ERROR for errors not * linked to any inode. The f_handle won't be reported * back to userspace. */ if (!inode) goto out; /* * !gpf means preallocated variable size fh, but fh_len could * be zero in that case if encoding fh len failed. */ err = -ENOENT; if (fh_len < 4 || WARN_ON_ONCE(fh_len % 4) || fh_len > MAX_HANDLE_SZ) goto out_err; /* No external buffer in a variable size allocated fh */ if (gfp && fh_len > FANOTIFY_INLINE_FH_LEN) { /* Treat failure to allocate fh as failure to encode fh */ err = -ENOMEM; ext_buf = kmalloc(fh_len, gfp); if (!ext_buf) goto out_err; *fanotify_fh_ext_buf_ptr(fh) = ext_buf; buf = ext_buf; fh->flags |= FANOTIFY_FH_FLAG_EXT_BUF; } dwords = fh_len >> 2; type = exportfs_encode_inode_fh(inode, buf, &dwords, NULL); err = -EINVAL; if (!type || type == FILEID_INVALID || fh_len != dwords << 2) goto out_err; fh->type = type; fh->len = fh_len; out: /* * Mix fh into event merge key. Hash might be NULL in case of * unhashed FID events (i.e. FAN_FS_ERROR). */ if (hash) *hash ^= fanotify_hash_fh(fh); return FANOTIFY_FH_HDR_LEN + fh_len; out_err: pr_warn_ratelimited("fanotify: failed to encode fid (type=%d, len=%d, err=%i)\n", type, fh_len, err); kfree(ext_buf); *fanotify_fh_ext_buf_ptr(fh) = NULL; /* Report the event without a file identifier on encode error */ fh->type = FILEID_INVALID; fh->len = 0; return 0; } /* * FAN_REPORT_FID is ambiguous in that it reports the fid of the child for * some events and the fid of the parent for create/delete/move events. * * With the FAN_REPORT_TARGET_FID flag, the fid of the child is reported * also in create/delete/move events in addition to the fid of the parent * and the name of the child. */ static inline bool fanotify_report_child_fid(unsigned int fid_mode, u32 mask) { if (mask & ALL_FSNOTIFY_DIRENT_EVENTS) return (fid_mode & FAN_REPORT_TARGET_FID); return (fid_mode & FAN_REPORT_FID) && !(mask & FAN_ONDIR); } /* * The inode to use as identifier when reporting fid depends on the event * and the group flags. * * With the group flag FAN_REPORT_TARGET_FID, always report the child fid. * * Without the group flag FAN_REPORT_TARGET_FID, report the modified directory * fid on dirent events and the child fid otherwise. * * For example: * FS_ATTRIB reports the child fid even if reported on a watched parent. * FS_CREATE reports the modified dir fid without FAN_REPORT_TARGET_FID. * and reports the created child fid with FAN_REPORT_TARGET_FID. */ static struct inode *fanotify_fid_inode(u32 event_mask, const void *data, int data_type, struct inode *dir, unsigned int fid_mode) { if ((event_mask & ALL_FSNOTIFY_DIRENT_EVENTS) && !(fid_mode & FAN_REPORT_TARGET_FID)) return dir; return fsnotify_data_inode(data, data_type); } /* * The inode to use as identifier when reporting dir fid depends on the event. * Report the modified directory inode on dirent modification events. * Report the "victim" inode if "victim" is a directory. * Report the parent inode if "victim" is not a directory and event is * reported to parent. * Otherwise, do not report dir fid. */ static struct inode *fanotify_dfid_inode(u32 event_mask, const void *data, int data_type, struct inode *dir) { struct inode *inode = fsnotify_data_inode(data, data_type); if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS) return dir; if (inode && S_ISDIR(inode->i_mode)) return inode; return dir; } static struct fanotify_event *fanotify_alloc_path_event(const struct path *path, unsigned int *hash, gfp_t gfp) { struct fanotify_path_event *pevent; pevent = kmem_cache_alloc(fanotify_path_event_cachep, gfp); if (!pevent) return NULL; pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH; pevent->path = *path; *hash ^= fanotify_hash_path(path); path_get(path); return &pevent->fae; } static struct fanotify_event *fanotify_alloc_perm_event(const struct path *path, gfp_t gfp) { struct fanotify_perm_event *pevent; pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp); if (!pevent) return NULL; pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH_PERM; pevent->response = 0; pevent->state = FAN_EVENT_INIT; pevent->path = *path; path_get(path); return &pevent->fae; } static struct fanotify_event *fanotify_alloc_fid_event(struct inode *id, __kernel_fsid_t *fsid, unsigned int *hash, gfp_t gfp) { struct fanotify_fid_event *ffe; ffe = kmem_cache_alloc(fanotify_fid_event_cachep, gfp); if (!ffe) return NULL; ffe->fae.type = FANOTIFY_EVENT_TYPE_FID; ffe->fsid = *fsid; *hash ^= fanotify_hash_fsid(fsid); fanotify_encode_fh(&ffe->object_fh, id, fanotify_encode_fh_len(id), hash, gfp); return &ffe->fae; } static struct fanotify_event *fanotify_alloc_name_event(struct inode *dir, __kernel_fsid_t *fsid, const struct qstr *name, struct inode *child, struct dentry *moved, unsigned int *hash, gfp_t gfp) { struct fanotify_name_event *fne; struct fanotify_info *info; struct fanotify_fh *dfh, *ffh; struct inode *dir2 = moved ? d_inode(moved->d_parent) : NULL; const struct qstr *name2 = moved ? &moved->d_name : NULL; unsigned int dir_fh_len = fanotify_encode_fh_len(dir); unsigned int dir2_fh_len = fanotify_encode_fh_len(dir2); unsigned int child_fh_len = fanotify_encode_fh_len(child); unsigned long name_len = name ? name->len : 0; unsigned long name2_len = name2 ? name2->len : 0; unsigned int len, size; /* Reserve terminating null byte even for empty name */ size = sizeof(*fne) + name_len + name2_len + 2; if (dir_fh_len) size += FANOTIFY_FH_HDR_LEN + dir_fh_len; if (dir2_fh_len) size += FANOTIFY_FH_HDR_LEN + dir2_fh_len; if (child_fh_len) size += FANOTIFY_FH_HDR_LEN + child_fh_len; fne = kmalloc(size, gfp); if (!fne) return NULL; fne->fae.type = FANOTIFY_EVENT_TYPE_FID_NAME; fne->fsid = *fsid; *hash ^= fanotify_hash_fsid(fsid); info = &fne->info; fanotify_info_init(info); if (dir_fh_len) { dfh = fanotify_info_dir_fh(info); len = fanotify_encode_fh(dfh, dir, dir_fh_len, hash, 0); fanotify_info_set_dir_fh(info, len); } if (dir2_fh_len) { dfh = fanotify_info_dir2_fh(info); len = fanotify_encode_fh(dfh, dir2, dir2_fh_len, hash, 0); fanotify_info_set_dir2_fh(info, len); } if (child_fh_len) { ffh = fanotify_info_file_fh(info); len = fanotify_encode_fh(ffh, child, child_fh_len, hash, 0); fanotify_info_set_file_fh(info, len); } if (name_len) { fanotify_info_copy_name(info, name); *hash ^= full_name_hash((void *)name_len, name->name, name_len); } if (name2_len) { fanotify_info_copy_name2(info, name2); *hash ^= full_name_hash((void *)name2_len, name2->name, name2_len); } pr_debug("%s: size=%u dir_fh_len=%u child_fh_len=%u name_len=%u name='%.*s'\n", __func__, size, dir_fh_len, child_fh_len, info->name_len, info->name_len, fanotify_info_name(info)); if (dir2_fh_len) { pr_debug("%s: dir2_fh_len=%u name2_len=%u name2='%.*s'\n", __func__, dir2_fh_len, info->name2_len, info->name2_len, fanotify_info_name2(info)); } return &fne->fae; } static struct fanotify_event *fanotify_alloc_error_event( struct fsnotify_group *group, __kernel_fsid_t *fsid, const void *data, int data_type, unsigned int *hash) { struct fs_error_report *report = fsnotify_data_error_report(data, data_type); struct inode *inode; struct fanotify_error_event *fee; int fh_len; if (WARN_ON_ONCE(!report)) return NULL; fee = mempool_alloc(&group->fanotify_data.error_events_pool, GFP_NOFS); if (!fee) return NULL; fee->fae.type = FANOTIFY_EVENT_TYPE_FS_ERROR; fee->error = report->error; fee->err_count = 1; fee->fsid = *fsid; inode = report->inode; fh_len = fanotify_encode_fh_len(inode); /* Bad fh_len. Fallback to using an invalid fh. Should never happen. */ if (!fh_len && inode) inode = NULL; fanotify_encode_fh(&fee->object_fh, inode, fh_len, NULL, 0); *hash ^= fanotify_hash_fsid(fsid); return &fee->fae; } static struct fanotify_event *fanotify_alloc_event( struct fsnotify_group *group, u32 mask, const void *data, int data_type, struct inode *dir, const struct qstr *file_name, __kernel_fsid_t *fsid, u32 match_mask) { struct fanotify_event *event = NULL; gfp_t gfp = GFP_KERNEL_ACCOUNT; unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS); struct inode *id = fanotify_fid_inode(mask, data, data_type, dir, fid_mode); struct inode *dirid = fanotify_dfid_inode(mask, data, data_type, dir); const struct path *path = fsnotify_data_path(data, data_type); struct mem_cgroup *old_memcg; struct dentry *moved = NULL; struct inode *child = NULL; bool name_event = false; unsigned int hash = 0; bool ondir = mask & FAN_ONDIR; struct pid *pid; if ((fid_mode & FAN_REPORT_DIR_FID) && dirid) { /* * For certain events and group flags, report the child fid * in addition to reporting the parent fid and maybe child name. */ if (fanotify_report_child_fid(fid_mode, mask) && id != dirid) child = id; id = dirid; /* * We record file name only in a group with FAN_REPORT_NAME * and when we have a directory inode to report. * * For directory entry modification event, we record the fid of * the directory and the name of the modified entry. * * For event on non-directory that is reported to parent, we * record the fid of the parent and the name of the child. * * Even if not reporting name, we need a variable length * fanotify_name_event if reporting both parent and child fids. */ if (!(fid_mode & FAN_REPORT_NAME)) { name_event = !!child; file_name = NULL; } else if ((mask & ALL_FSNOTIFY_DIRENT_EVENTS) || !ondir) { name_event = true; } /* * In the special case of FAN_RENAME event, use the match_mask * to determine if we need to report only the old parent+name, * only the new parent+name or both. * 'dirid' and 'file_name' are the old parent+name and * 'moved' has the new parent+name. */ if (mask & FAN_RENAME) { bool report_old, report_new; if (WARN_ON_ONCE(!match_mask)) return NULL; /* Report both old and new parent+name if sb watching */ report_old = report_new = match_mask & (1U << FSNOTIFY_ITER_TYPE_SB); report_old |= match_mask & (1U << FSNOTIFY_ITER_TYPE_INODE); report_new |= match_mask & (1U << FSNOTIFY_ITER_TYPE_INODE2); if (!report_old) { /* Do not report old parent+name */ dirid = NULL; file_name = NULL; } if (report_new) { /* Report new parent+name */ moved = fsnotify_data_dentry(data, data_type); } } } /* * For queues with unlimited length lost events are not expected and * can possibly have security implications. Avoid losing events when * memory is short. For the limited size queues, avoid OOM killer in the * target monitoring memcg as it may have security repercussion. */ if (group->max_events == UINT_MAX) gfp |= __GFP_NOFAIL; else gfp |= __GFP_RETRY_MAYFAIL; /* Whoever is interested in the event, pays for the allocation. */ old_memcg = set_active_memcg(group->memcg); if (fanotify_is_perm_event(mask)) { event = fanotify_alloc_perm_event(path, gfp); } else if (fanotify_is_error_event(mask)) { event = fanotify_alloc_error_event(group, fsid, data, data_type, &hash); } else if (name_event && (file_name || moved || child)) { event = fanotify_alloc_name_event(dirid, fsid, file_name, child, moved, &hash, gfp); } else if (fid_mode) { event = fanotify_alloc_fid_event(id, fsid, &hash, gfp); } else { event = fanotify_alloc_path_event(path, &hash, gfp); } if (!event) goto out; if (FAN_GROUP_FLAG(group, FAN_REPORT_TID)) pid = get_pid(task_pid(current)); else pid = get_pid(task_tgid(current)); /* Mix event info, FAN_ONDIR flag and pid into event merge key */ hash ^= hash_long((unsigned long)pid | ondir, FANOTIFY_EVENT_HASH_BITS); fanotify_init_event(event, hash, mask); event->pid = pid; out: set_active_memcg(old_memcg); return event; } /* * Get cached fsid of the filesystem containing the object from any connector. * All connectors are supposed to have the same fsid, but we do not verify that * here. */ static __kernel_fsid_t fanotify_get_fsid(struct fsnotify_iter_info *iter_info) { struct fsnotify_mark *mark; int type; __kernel_fsid_t fsid = {}; fsnotify_foreach_iter_mark_type(iter_info, mark, type) { struct fsnotify_mark_connector *conn; conn = READ_ONCE(mark->connector); /* Mark is just getting destroyed or created? */ if (!conn) continue; if (!(conn->flags & FSNOTIFY_CONN_FLAG_HAS_FSID)) continue; /* Pairs with smp_wmb() in fsnotify_add_mark_list() */ smp_rmb(); fsid = conn->fsid; if (WARN_ON_ONCE(!fsid.val[0] && !fsid.val[1])) continue; return fsid; } return fsid; } /* * Add an event to hash table for faster merge. */ static void fanotify_insert_event(struct fsnotify_group *group, struct fsnotify_event *fsn_event) { struct fanotify_event *event = FANOTIFY_E(fsn_event); unsigned int bucket = fanotify_event_hash_bucket(group, event); struct hlist_head *hlist = &group->fanotify_data.merge_hash[bucket]; assert_spin_locked(&group->notification_lock); if (!fanotify_is_hashed_event(event->mask)) return; pr_debug("%s: group=%p event=%p bucket=%u\n", __func__, group, event, bucket); hlist_add_head(&event->merge_list, hlist); } static int fanotify_handle_event(struct fsnotify_group *group, u32 mask, const void *data, int data_type, struct inode *dir, const struct qstr *file_name, u32 cookie, struct fsnotify_iter_info *iter_info) { int ret = 0; struct fanotify_event *event; struct fsnotify_event *fsn_event; __kernel_fsid_t fsid = {}; u32 match_mask = 0; BUILD_BUG_ON(FAN_ACCESS != FS_ACCESS); BUILD_BUG_ON(FAN_MODIFY != FS_MODIFY); BUILD_BUG_ON(FAN_ATTRIB != FS_ATTRIB); BUILD_BUG_ON(FAN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE); BUILD_BUG_ON(FAN_CLOSE_WRITE != FS_CLOSE_WRITE); BUILD_BUG_ON(FAN_OPEN != FS_OPEN); BUILD_BUG_ON(FAN_MOVED_TO != FS_MOVED_TO); BUILD_BUG_ON(FAN_MOVED_FROM != FS_MOVED_FROM); BUILD_BUG_ON(FAN_CREATE != FS_CREATE); BUILD_BUG_ON(FAN_DELETE != FS_DELETE); BUILD_BUG_ON(FAN_DELETE_SELF != FS_DELETE_SELF); BUILD_BUG_ON(FAN_MOVE_SELF != FS_MOVE_SELF); BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD); BUILD_BUG_ON(FAN_Q_OVERFLOW != FS_Q_OVERFLOW); BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM); BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM); BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR); BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC); BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM); BUILD_BUG_ON(FAN_FS_ERROR != FS_ERROR); BUILD_BUG_ON(FAN_RENAME != FS_RENAME); BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 21); mask = fanotify_group_event_mask(group, iter_info, &match_mask, mask, data, data_type, dir); if (!mask) return 0; pr_debug("%s: group=%p mask=%x report_mask=%x\n", __func__, group, mask, match_mask); if (fanotify_is_perm_event(mask)) { /* * fsnotify_prepare_user_wait() fails if we race with mark * deletion. Just let the operation pass in that case. */ if (!fsnotify_prepare_user_wait(iter_info)) return 0; } if (FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS)) { fsid = fanotify_get_fsid(iter_info); /* Racing with mark destruction or creation? */ if (!fsid.val[0] && !fsid.val[1]) return 0; } event = fanotify_alloc_event(group, mask, data, data_type, dir, file_name, &fsid, match_mask); ret = -ENOMEM; if (unlikely(!event)) { /* * We don't queue overflow events for permission events as * there the access is denied and so no event is in fact lost. */ if (!fanotify_is_perm_event(mask)) fsnotify_queue_overflow(group); goto finish; } fsn_event = &event->fse; ret = fsnotify_insert_event(group, fsn_event, fanotify_merge, fanotify_insert_event); if (ret) { /* Permission events shouldn't be merged */ BUG_ON(ret == 1 && mask & FANOTIFY_PERM_EVENTS); /* Our event wasn't used in the end. Free it. */ fsnotify_destroy_event(group, fsn_event); ret = 0; } else if (fanotify_is_perm_event(mask)) { ret = fanotify_get_response(group, FANOTIFY_PERM(event), iter_info); } finish: if (fanotify_is_perm_event(mask)) fsnotify_finish_user_wait(iter_info); return ret; } static void fanotify_free_group_priv(struct fsnotify_group *group) { kfree(group->fanotify_data.merge_hash); if (group->fanotify_data.ucounts) dec_ucount(group->fanotify_data.ucounts, UCOUNT_FANOTIFY_GROUPS); if (mempool_initialized(&group->fanotify_data.error_events_pool)) mempool_exit(&group->fanotify_data.error_events_pool); } static void fanotify_free_path_event(struct fanotify_event *event) { path_put(fanotify_event_path(event)); kmem_cache_free(fanotify_path_event_cachep, FANOTIFY_PE(event)); } static void fanotify_free_perm_event(struct fanotify_event *event) { path_put(fanotify_event_path(event)); kmem_cache_free(fanotify_perm_event_cachep, FANOTIFY_PERM(event)); } static void fanotify_free_fid_event(struct fanotify_event *event) { struct fanotify_fid_event *ffe = FANOTIFY_FE(event); if (fanotify_fh_has_ext_buf(&ffe->object_fh)) kfree(fanotify_fh_ext_buf(&ffe->object_fh)); kmem_cache_free(fanotify_fid_event_cachep, ffe); } static void fanotify_free_name_event(struct fanotify_event *event) { kfree(FANOTIFY_NE(event)); } static void fanotify_free_error_event(struct fsnotify_group *group, struct fanotify_event *event) { struct fanotify_error_event *fee = FANOTIFY_EE(event); mempool_free(fee, &group->fanotify_data.error_events_pool); } static void fanotify_free_event(struct fsnotify_group *group, struct fsnotify_event *fsn_event) { struct fanotify_event *event; event = FANOTIFY_E(fsn_event); put_pid(event->pid); switch (event->type) { case FANOTIFY_EVENT_TYPE_PATH: fanotify_free_path_event(event); break; case FANOTIFY_EVENT_TYPE_PATH_PERM: fanotify_free_perm_event(event); break; case FANOTIFY_EVENT_TYPE_FID: fanotify_free_fid_event(event); break; case FANOTIFY_EVENT_TYPE_FID_NAME: fanotify_free_name_event(event); break; case FANOTIFY_EVENT_TYPE_OVERFLOW: kfree(event); break; case FANOTIFY_EVENT_TYPE_FS_ERROR: fanotify_free_error_event(group, event); break; default: WARN_ON_ONCE(1); } } static void fanotify_freeing_mark(struct fsnotify_mark *mark, struct fsnotify_group *group) { if (!FAN_GROUP_FLAG(group, FAN_UNLIMITED_MARKS)) dec_ucount(group->fanotify_data.ucounts, UCOUNT_FANOTIFY_MARKS); } static void fanotify_free_mark(struct fsnotify_mark *fsn_mark) { kmem_cache_free(fanotify_mark_cache, fsn_mark); } const struct fsnotify_ops fanotify_fsnotify_ops = { .handle_event = fanotify_handle_event, .free_group_priv = fanotify_free_group_priv, .free_event = fanotify_free_event, .freeing_mark = fanotify_freeing_mark, .free_mark = fanotify_free_mark, };