fanotify: report parent fid + name + child fid

For a group with fanotify_init() flag FAN_REPORT_DFID_NAME, the parent
fid and name are reported for events on non-directory objects with an
info record of type FAN_EVENT_INFO_TYPE_DFID_NAME.

If the group also has the init flag FAN_REPORT_FID, the child fid
is also reported with another info record that follows the first info
record. The second info record is the same info record that would have
been reported to a group with only FAN_REPORT_FID flag.

When the child fid needs to be recorded, the variable size struct
fanotify_name_event is preallocated with enough space to store the
child fh between the dir fh and the name.

Link: https://lore.kernel.org/r/20200716084230.30611-22-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 23 insertions, 4 deletions

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index d793f3e56b26..4d1edddfbbb4 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -477,15 +477,19 @@ static struct fanotify_event *fanotify_alloc_fid_event(struct inode *id,
 static struct fanotify_event *fanotify_alloc_name_event(struct inode *id,
 							__kernel_fsid_t *fsid,
 							const struct qstr *file_name,
+							struct inode *child,
 							gfp_t gfp)
 {
 	struct fanotify_name_event *fne;
 	struct fanotify_info *info;
-	struct fanotify_fh *dfh;
+	struct fanotify_fh *dfh, *ffh;
 	unsigned int dir_fh_len = fanotify_encode_fh_len(id);
+	unsigned int child_fh_len = fanotify_encode_fh_len(child);
 	unsigned int size;
 
 	size = sizeof(*fne) + FANOTIFY_FH_HDR_LEN + dir_fh_len;
+	if (child_fh_len)
+		size += FANOTIFY_FH_HDR_LEN + child_fh_len;
 	if (file_name)
 		size += file_name->len + 1;
 	fne = kmalloc(size, gfp);
@@ -498,11 +502,15 @@ static struct fanotify_event *fanotify_alloc_name_event(struct inode *id,
 	fanotify_info_init(info);
 	dfh = fanotify_info_dir_fh(info);
 	info->dir_fh_totlen = fanotify_encode_fh(dfh, id, dir_fh_len, 0);
+	if (child_fh_len) {
+		ffh = fanotify_info_file_fh(info);
+		info->file_fh_totlen = fanotify_encode_fh(ffh, child, child_fh_len, 0);
+	}
 	if (file_name)
 		fanotify_info_copy_name(info, file_name);
 
-	pr_debug("%s: ino=%lu size=%u dir_fh_len=%u name_len=%u name='%.*s'\n",
-		 __func__, id->i_ino, size, dir_fh_len,
+	pr_debug("%s: ino=%lu size=%u dir_fh_len=%u child_fh_len=%u name_len=%u name='%.*s'\n",
+		 __func__, id->i_ino, size, dir_fh_len, child_fh_len,
 		 info->name_len, info->name_len, fanotify_info_name(info));
 
 	return &fne->fae;
@@ -520,9 +528,19 @@ static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
 	struct inode *dirid = fanotify_dfid_inode(mask, data, data_type, dir);
 	const struct path *path = fsnotify_data_path(data, data_type);
 	unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
+	struct inode *child = NULL;
 	bool name_event = false;
 
 	if ((fid_mode & FAN_REPORT_DIR_FID) && dirid) {
+		/*
+		 * With both flags FAN_REPORT_DIR_FID and FAN_REPORT_FID, we
+		 * report the child fid for events reported on a non-dir child
+		 * in addition to reporting the parent fid and child name.
+		 */
+		if ((fid_mode & FAN_REPORT_FID) &&
+		    id != dirid && !(mask & FAN_ONDIR))
+			child = id;
+
 		id = dirid;
 
 		/*
@@ -558,7 +576,8 @@ static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
 	if (fanotify_is_perm_event(mask)) {
 		event = fanotify_alloc_perm_event(path, gfp);
 	} else if (name_event && file_name) {
-		event = fanotify_alloc_name_event(id, fsid, file_name, gfp);
+		event = fanotify_alloc_name_event(id, fsid, file_name, child,
+						  gfp);
 	} else if (fid_mode) {
 		event = fanotify_alloc_fid_event(id, fsid, gfp);
 	} else {