1 /* SPDX-License-Identifier: GPL-2.0 */
13 /* Possible states of the permission event */
39 /* Variable size struct for dir file handle + child file handle + name */
53 	 * name starts at buf[dir_fh_totlen + dir2_fh_totlen + file_fh_totlen]
56 #define FANOTIFY_DIR_FH_SIZE(info)	((info)->dir_fh_totlen)
57 #define FANOTIFY_DIR2_FH_SIZE(info)	((info)->dir2_fh_totlen)
58 #define FANOTIFY_FILE_FH_SIZE(info)	((info)->file_fh_totlen)
59 #define FANOTIFY_NAME_SIZE(info)	((info)->name_len + 1)
60 #define FANOTIFY_NAME2_SIZE(info)	((info)->name2_len + 1)
73 	((info)->buf + FANOTIFY_DIR_FH_OFFSET(info))
75 	((info)->buf + FANOTIFY_DIR2_FH_OFFSET(info))
77 	((info)->buf + FANOTIFY_FILE_FH_OFFSET(info))
79 	((info)->buf + FANOTIFY_NAME_OFFSET(info))
81 	((info)->buf + FANOTIFY_NAME2_OFFSET(info))
86 	return (fh->flags & FANOTIFY_FH_FLAG_EXT_BUF);  in fanotify_fh_has_ext_buf()
92 	BUILD_BUG_ON(__alignof__(char *) - 4 + sizeof(char *) >  in fanotify_fh_ext_buf_ptr()
94 	return (char **)ALIGN((unsigned long)(fh->buf), __alignof__(char *));  in fanotify_fh_ext_buf_ptr()
104 	return fanotify_fh_has_ext_buf(fh) ? fanotify_fh_ext_buf(fh) : fh->buf;  in fanotify_fh_buf()
109 	if (!info->dir_fh_totlen ||  in fanotify_info_dir_fh_len()
110 	    WARN_ON_ONCE(info->dir_fh_totlen < FANOTIFY_FH_HDR_LEN))  in fanotify_info_dir_fh_len()
113 	return info->dir_fh_totlen - FANOTIFY_FH_HDR_LEN;  in fanotify_info_dir_fh_len()
125 	if (!info->dir2_fh_totlen ||  in fanotify_info_dir2_fh_len()
126 	    WARN_ON_ONCE(info->dir2_fh_totlen < FANOTIFY_FH_HDR_LEN))  in fanotify_info_dir2_fh_len()
129 	return info->dir2_fh_totlen - FANOTIFY_FH_HDR_LEN;  in fanotify_info_dir2_fh_len()
139 	if (!info->file_fh_totlen ||  in fanotify_info_file_fh_len()
140 	    WARN_ON_ONCE(info->file_fh_totlen < FANOTIFY_FH_HDR_LEN))  in fanotify_info_file_fh_len()
143 	return info->file_fh_totlen - FANOTIFY_FH_HDR_LEN;  in fanotify_info_file_fh_len()
153 	if (!info->name_len)  in fanotify_info_name()
161 	if (!info->name2_len)  in fanotify_info_name2()
172 	info->dir_fh_totlen = 0;  in fanotify_info_init()
173 	info->dir2_fh_totlen = 0;  in fanotify_info_init()
174 	info->file_fh_totlen = 0;  in fanotify_info_init()
175 	info->name_len = 0;  in fanotify_info_init()
176 	info->name2_len = 0;  in fanotify_info_init()
183 	if (WARN_ON_ONCE(info->dir2_fh_totlen > 0) ||  in fanotify_info_set_dir_fh()
184 	    WARN_ON_ONCE(info->file_fh_totlen > 0) ||  in fanotify_info_set_dir_fh()
185 	    WARN_ON_ONCE(info->name_len > 0) ||  in fanotify_info_set_dir_fh()
186 	    WARN_ON_ONCE(info->name2_len > 0))  in fanotify_info_set_dir_fh()
189 	info->dir_fh_totlen = totlen;  in fanotify_info_set_dir_fh()
195 	if (WARN_ON_ONCE(info->file_fh_totlen > 0) ||  in fanotify_info_set_dir2_fh()
196 	    WARN_ON_ONCE(info->name_len > 0) ||  in fanotify_info_set_dir2_fh()
197 	    WARN_ON_ONCE(info->name2_len > 0))  in fanotify_info_set_dir2_fh()
200 	info->dir2_fh_totlen = totlen;  in fanotify_info_set_dir2_fh()
206 	if (WARN_ON_ONCE(info->name_len > 0) ||  in fanotify_info_set_file_fh()
207 	    WARN_ON_ONCE(info->name2_len > 0))  in fanotify_info_set_file_fh()
210 	info->file_fh_totlen = totlen;  in fanotify_info_set_file_fh()
214 					   const struct qstr *name)  in fanotify_info_copy_name()  argument
216 	if (WARN_ON_ONCE(name->len > NAME_MAX) ||  in fanotify_info_copy_name()
217 	    WARN_ON_ONCE(info->name2_len > 0))  in fanotify_info_copy_name()
220 	info->name_len = name->len;  in fanotify_info_copy_name()
221 	strcpy(fanotify_info_name(info), name->name);  in fanotify_info_copy_name()
225 					    const struct qstr *name)  in fanotify_info_copy_name2()  argument
227 	if (WARN_ON_ONCE(name->len > NAME_MAX))  in fanotify_info_copy_name2()
230 	info->name2_len = name->len;  in fanotify_info_copy_name2()
231 	strcpy(fanotify_info_name2(info), name->name);  in fanotify_info_copy_name2()
237  * userspace. The type of event determines how it was allocated, how it will
251 	(ilog2(__FANOTIFY_EVENT_TYPE_NUM - 1) + 1)
253 	(32 - FANOTIFY_EVENT_TYPE_BITS)
266 static inline void fanotify_init_event(struct fanotify_event *event,  in fanotify_init_event()  argument
269 	fsnotify_init_event(&event->fse);  in fanotify_init_event()
270 	INIT_HLIST_NODE(&event->merge_list);  in fanotify_init_event()
271 	event->hash = hash;  in fanotify_init_event()
272 	event->mask = mask;  in fanotify_init_event()
273 	event->pid = NULL;  in fanotify_init_event()
276 #define FANOTIFY_INLINE_FH(name, size)					\  argument
278 	struct fanotify_fh (name);					\
279 	/* Space for object_fh.buf[] - access with fanotify_fh_buf() */	\
291 FANOTIFY_FE(struct fanotify_event *event)  in FANOTIFY_FE()  argument
293 	return container_of(event, struct fanotify_fid_event, fae);  in FANOTIFY_FE()
303 FANOTIFY_NE(struct fanotify_event *event)  in FANOTIFY_NE()  argument
305 	return container_of(event, struct fanotify_name_event, fae);  in FANOTIFY_NE()
319 FANOTIFY_EE(struct fanotify_event *event)  in FANOTIFY_EE()  argument
321 	return container_of(event, struct fanotify_error_event, fae);  in FANOTIFY_EE()
324 static inline __kernel_fsid_t *fanotify_event_fsid(struct fanotify_event *event)  in fanotify_event_fsid()  argument
326 	if (event->type == FANOTIFY_EVENT_TYPE_FID)  in fanotify_event_fsid()
327 		return &FANOTIFY_FE(event)->fsid;  in fanotify_event_fsid()
328 	else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)  in fanotify_event_fsid()
329 		return &FANOTIFY_NE(event)->fsid;  in fanotify_event_fsid()
330 	else if (event->type == FANOTIFY_EVENT_TYPE_FS_ERROR)  in fanotify_event_fsid()
331 		return &FANOTIFY_EE(event)->fsid;  in fanotify_event_fsid()
337 						struct fanotify_event *event)  in fanotify_event_object_fh()  argument
339 	if (event->type == FANOTIFY_EVENT_TYPE_FID)  in fanotify_event_object_fh()
340 		return &FANOTIFY_FE(event)->object_fh;  in fanotify_event_object_fh()
341 	else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)  in fanotify_event_object_fh()
342 		return fanotify_info_file_fh(&FANOTIFY_NE(event)->info);  in fanotify_event_object_fh()
343 	else if (event->type == FANOTIFY_EVENT_TYPE_FS_ERROR)  in fanotify_event_object_fh()
344 		return &FANOTIFY_EE(event)->object_fh;  in fanotify_event_object_fh()
350 						struct fanotify_event *event)  in fanotify_event_info()  argument
352 	if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)  in fanotify_event_info()
353 		return &FANOTIFY_NE(event)->info;  in fanotify_event_info()
358 static inline int fanotify_event_object_fh_len(struct fanotify_event *event)  in fanotify_event_object_fh_len()  argument
360 	struct fanotify_info *info = fanotify_event_info(event);  in fanotify_event_object_fh_len()
361 	struct fanotify_fh *fh = fanotify_event_object_fh(event);  in fanotify_event_object_fh_len()
364 		return info->file_fh_totlen ? fh->len : 0;  in fanotify_event_object_fh_len()
366 		return fh ? fh->len : 0;  in fanotify_event_object_fh_len()
369 static inline int fanotify_event_dir_fh_len(struct fanotify_event *event)  in fanotify_event_dir_fh_len()  argument
371 	struct fanotify_info *info = fanotify_event_info(event);  in fanotify_event_dir_fh_len()
376 static inline int fanotify_event_dir2_fh_len(struct fanotify_event *event)  in fanotify_event_dir2_fh_len()  argument
378 	struct fanotify_info *info = fanotify_event_info(event);  in fanotify_event_dir2_fh_len()
383 static inline bool fanotify_event_has_object_fh(struct fanotify_event *event)  in fanotify_event_has_object_fh()  argument
386 	if (event->type == FANOTIFY_EVENT_TYPE_FS_ERROR)  in fanotify_event_has_object_fh()
388 	return fanotify_event_object_fh_len(event) > 0;  in fanotify_event_has_object_fh()
391 static inline bool fanotify_event_has_dir_fh(struct fanotify_event *event)  in fanotify_event_has_dir_fh()  argument
393 	return fanotify_event_dir_fh_len(event) > 0;  in fanotify_event_has_dir_fh()
396 static inline bool fanotify_event_has_dir2_fh(struct fanotify_event *event)  in fanotify_event_has_dir2_fh()  argument
398 	return fanotify_event_dir2_fh_len(event) > 0;  in fanotify_event_has_dir2_fh()
401 static inline bool fanotify_event_has_any_dir_fh(struct fanotify_event *event)  in fanotify_event_has_any_dir_fh()  argument
403 	return fanotify_event_has_dir_fh(event) ||  in fanotify_event_has_any_dir_fh()
404 		fanotify_event_has_dir2_fh(event);  in fanotify_event_has_any_dir_fh()
413 FANOTIFY_PE(struct fanotify_event *event)  in FANOTIFY_PE()  argument
415 	return container_of(event, struct fanotify_path_event, fae);  in FANOTIFY_PE()
422  * group->notification_list to group->fanotify_data.access_list to wait for
428 	u32 response;			/* userspace answer to the event */
429 	unsigned short state;		/* state of the event */
430 	int fd;		/* fd we passed to userspace for this event */
438 FANOTIFY_PERM(struct fanotify_event *event)  in FANOTIFY_PERM()  argument
440 	return container_of(event, struct fanotify_perm_event, fae);  in FANOTIFY_PERM()
459 static inline const struct path *fanotify_event_path(struct fanotify_event *event)  in fanotify_event_path()  argument
461 	if (event->type == FANOTIFY_EVENT_TYPE_PATH)  in fanotify_event_path()
462 		return &FANOTIFY_PE(event)->path;  in fanotify_event_path()
463 	else if (event->type == FANOTIFY_EVENT_TYPE_PATH_PERM)  in fanotify_event_path()
464 		return &FANOTIFY_PERM(event)->path;  in fanotify_event_path()
474 #define FANOTIFY_HTABLE_MASK	(FANOTIFY_HTABLE_SIZE - 1)
477  * Permission events and overflow event do not get merged - don't hash them.
487 						struct fanotify_event *event)  in fanotify_event_hash_bucket()  argument
489 	return event->hash & FANOTIFY_HTABLE_MASK;  in fanotify_event_hash_bucket()
496 	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)  in fanotify_mark_user_flags()
498 	if (mark->flags & FSNOTIFY_MARK_FLAG_NO_IREF)  in fanotify_mark_user_flags()
500 	if (mark->flags & FSNOTIFY_MARK_FLAG_HAS_IGNORE_FLAGS)  in fanotify_mark_user_flags()