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-rw-r--r--fs/notify/fanotify/fanotify.c18
-rw-r--r--fs/notify/fanotify/fanotify_user.c45
-rw-r--r--include/linux/fanotify.h2
-rw-r--r--include/uapi/linux/fanotify.h4
4 files changed, 58 insertions, 11 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index fc2e1fab34af..d793f3e56b26 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -522,9 +522,25 @@ static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
bool name_event = false;
- if ((fid_mode & FAN_REPORT_DIR_FID) && dirid)
+ if ((fid_mode & FAN_REPORT_DIR_FID) && dirid) {
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.
+ */
+ if ((fid_mode & FAN_REPORT_NAME) &&
+ ((mask & ALL_FSNOTIFY_DIRENT_EVENTS) ||
+ !(mask & FAN_ONDIR)))
+ name_event = true;
+ }
+
/*
* For queues with unlimited length lost events are not expected and
* can possibly have security implications. Avoid losing events when
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 7caa64d028ba..6b839790cb42 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -64,18 +64,27 @@ static int fanotify_fid_info_len(int fh_len, int name_len)
return roundup(FANOTIFY_INFO_HDR_LEN + info_len, FANOTIFY_EVENT_ALIGN);
}
-static int fanotify_event_info_len(struct fanotify_event *event)
+static int fanotify_event_info_len(unsigned int fid_mode,
+ struct fanotify_event *event)
{
struct fanotify_info *info = fanotify_event_info(event);
int dir_fh_len = fanotify_event_dir_fh_len(event);
int fh_len = fanotify_event_object_fh_len(event);
int info_len = 0;
+ int dot_len = 0;
- if (dir_fh_len)
+ if (dir_fh_len) {
info_len += fanotify_fid_info_len(dir_fh_len, info->name_len);
+ } else if ((fid_mode & FAN_REPORT_NAME) && (event->mask & FAN_ONDIR)) {
+ /*
+ * With group flag FAN_REPORT_NAME, if name was not recorded in
+ * event on a directory, we will report the name ".".
+ */
+ dot_len = 1;
+ }
if (fh_len)
- info_len += fanotify_fid_info_len(fh_len, 0);
+ info_len += fanotify_fid_info_len(fh_len, dot_len);
return info_len;
}
@@ -91,6 +100,7 @@ static struct fanotify_event *get_one_event(struct fsnotify_group *group,
{
size_t event_size = FAN_EVENT_METADATA_LEN;
struct fanotify_event *event = NULL;
+ unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
pr_debug("%s: group=%p count=%zd\n", __func__, group, count);
@@ -98,8 +108,8 @@ static struct fanotify_event *get_one_event(struct fsnotify_group *group,
if (fsnotify_notify_queue_is_empty(group))
goto out;
- if (FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS)) {
- event_size += fanotify_event_info_len(
+ if (fid_mode) {
+ event_size += fanotify_event_info_len(fid_mode,
FANOTIFY_E(fsnotify_peek_first_event(group)));
}
@@ -325,7 +335,7 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
metadata.event_len = FAN_EVENT_METADATA_LEN +
- fanotify_event_info_len(event);
+ fanotify_event_info_len(fid_mode, event);
metadata.metadata_len = FAN_EVENT_METADATA_LEN;
metadata.vers = FANOTIFY_METADATA_VERSION;
metadata.reserved = 0;
@@ -374,12 +384,25 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
}
if (fanotify_event_object_fh_len(event)) {
+ const char *dot = NULL;
+ int dot_len = 0;
+
if (fid_mode == FAN_REPORT_FID || info_type) {
/*
* With only group flag FAN_REPORT_FID only type FID is
* reported. Second info record type is always FID.
*/
info_type = FAN_EVENT_INFO_TYPE_FID;
+ } else if ((fid_mode & FAN_REPORT_NAME) &&
+ (event->mask & FAN_ONDIR)) {
+ /*
+ * With group flag FAN_REPORT_NAME, if name was not
+ * recorded in an event on a directory, report the
+ * name "." with info type DFID_NAME.
+ */
+ info_type = FAN_EVENT_INFO_TYPE_DFID_NAME;
+ dot = ".";
+ dot_len = 1;
} else if ((event->mask & ALL_FSNOTIFY_DIRENT_EVENTS) ||
(event->mask & FAN_ONDIR)) {
/*
@@ -400,7 +423,7 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
ret = copy_info_to_user(fanotify_event_fsid(event),
fanotify_event_object_fh(event),
- info_type, NULL, 0, buf, count);
+ info_type, dot, dot_len, buf, count);
if (ret < 0)
return ret;
@@ -932,11 +955,15 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
if (fid_mode && class != FAN_CLASS_NOTIF)
return -EINVAL;
- /* Reporting either object fid or dir fid */
+ /*
+ * Reporting either object fid or dir fid.
+ * Child name is reported with parent fid so requires dir fid.
+ */
switch (fid_mode) {
case 0:
case FAN_REPORT_FID:
case FAN_REPORT_DIR_FID:
+ case FAN_REPORT_DFID_NAME:
break;
default:
return -EINVAL;
@@ -1294,7 +1321,7 @@ COMPAT_SYSCALL_DEFINE6(fanotify_mark,
*/
static int __init fanotify_user_setup(void)
{
- BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 9);
+ BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 10);
BUILD_BUG_ON(HWEIGHT32(FANOTIFY_MARK_FLAGS) != 9);
fanotify_mark_cache = KMEM_CACHE(fsnotify_mark,
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 4ddac97b2bf7..3e9c56ee651f 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -18,7 +18,7 @@
#define FANOTIFY_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \
FAN_CLASS_PRE_CONTENT)
-#define FANOTIFY_FID_BITS (FAN_REPORT_FID | FAN_REPORT_DIR_FID)
+#define FANOTIFY_FID_BITS (FAN_REPORT_FID | FAN_REPORT_DFID_NAME)
#define FANOTIFY_INIT_FLAGS (FANOTIFY_CLASS_BITS | FANOTIFY_FID_BITS | \
FAN_REPORT_TID | \
diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h
index 21afebf77fd7..fbf9c5c7dd59 100644
--- a/include/uapi/linux/fanotify.h
+++ b/include/uapi/linux/fanotify.h
@@ -54,6 +54,10 @@
#define FAN_REPORT_TID 0x00000100 /* event->pid is thread id */
#define FAN_REPORT_FID 0x00000200 /* Report unique file id */
#define FAN_REPORT_DIR_FID 0x00000400 /* Report unique directory id */
+#define FAN_REPORT_NAME 0x00000800 /* Report events with name */
+
+/* Convenience macro - FAN_REPORT_NAME requires FAN_REPORT_DIR_FID */
+#define FAN_REPORT_DFID_NAME (FAN_REPORT_DIR_FID | FAN_REPORT_NAME)
/* Deprecated - do not use this in programs and do not add new flags here! */
#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-28 00:31:42 +0000