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Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fanotify/fanotify.h5
-rw-r--r--fs/notify/fanotify/fanotify_user.c82
2 files changed, 82 insertions, 5 deletions
diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h
index 271482fb9611..4aafc7144c3d 100644
--- a/fs/notify/fanotify/fanotify.h
+++ b/fs/notify/fanotify/fanotify.h
@@ -95,6 +95,11 @@ static inline bool fanotify_event_has_ext_fh(struct fanotify_event *event)
event->fh_len > FANOTIFY_INLINE_FH_LEN;
}
+static inline void *fanotify_event_fh(struct fanotify_event *event)
+{
+ return fanotify_fid_fh(&event->fid, event->fh_len);
+}
+
/*
* Structure for permission fanotify events. It gets allocated and freed in
* fanotify_handle_event() since we wait there for user response. When the
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index c965fcf4979e..cd82dd713c91 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -47,6 +47,18 @@ struct kmem_cache *fanotify_mark_cache __read_mostly;
struct kmem_cache *fanotify_event_cachep __read_mostly;
struct kmem_cache *fanotify_perm_event_cachep __read_mostly;
+#define FANOTIFY_EVENT_ALIGN 4
+
+static int fanotify_event_info_len(struct fanotify_event *event)
+{
+ if (!fanotify_event_has_fid(event))
+ return 0;
+
+ return roundup(sizeof(struct fanotify_event_info_fid) +
+ sizeof(struct file_handle) + event->fh_len,
+ FANOTIFY_EVENT_ALIGN);
+}
+
/*
* Get an fsnotify notification event if one exists and is small
* enough to fit in "count". Return an error pointer if the count
@@ -57,6 +69,9 @@ struct kmem_cache *fanotify_perm_event_cachep __read_mostly;
static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
size_t count)
{
+ size_t event_size = FAN_EVENT_METADATA_LEN;
+ struct fanotify_event *event;
+
assert_spin_locked(&group->notification_lock);
pr_debug("%s: group=%p count=%zd\n", __func__, group, count);
@@ -64,11 +79,18 @@ static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
if (fsnotify_notify_queue_is_empty(group))
return NULL;
- if (FAN_EVENT_METADATA_LEN > count)
+ if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
+ event = FANOTIFY_E(fsnotify_peek_first_event(group));
+ event_size += fanotify_event_info_len(event);
+ }
+
+ if (event_size > count)
return ERR_PTR(-EINVAL);
- /* held the notification_lock the whole time, so this is the
- * same event we peeked above */
+ /*
+ * Held the notification_lock the whole time, so this is the
+ * same event we peeked above
+ */
return fsnotify_remove_first_event(group);
}
@@ -174,6 +196,48 @@ static int process_access_response(struct fsnotify_group *group,
return 0;
}
+static int copy_fid_to_user(struct fanotify_event *event, char __user *buf)
+{
+ struct fanotify_event_info_fid info = { };
+ struct file_handle handle = { };
+ size_t fh_len = event->fh_len;
+ size_t len = fanotify_event_info_len(event);
+
+ if (!len)
+ return 0;
+
+ if (WARN_ON_ONCE(len < sizeof(info) + sizeof(handle) + fh_len))
+ return -EFAULT;
+
+ /* Copy event info fid header followed by vaiable sized file handle */
+ info.hdr.info_type = FAN_EVENT_INFO_TYPE_FID;
+ info.hdr.len = len;
+ info.fsid = event->fid.fsid;
+ if (copy_to_user(buf, &info, sizeof(info)))
+ return -EFAULT;
+
+ buf += sizeof(info);
+ len -= sizeof(info);
+ handle.handle_type = event->fh_type;
+ handle.handle_bytes = fh_len;
+ if (copy_to_user(buf, &handle, sizeof(handle)))
+ return -EFAULT;
+
+ buf += sizeof(handle);
+ len -= sizeof(handle);
+ if (copy_to_user(buf, fanotify_event_fh(event), fh_len))
+ return -EFAULT;
+
+ /* Pad with 0's */
+ buf += fh_len;
+ len -= fh_len;
+ WARN_ON_ONCE(len < 0 || len >= FANOTIFY_EVENT_ALIGN);
+ if (len > 0 && clear_user(buf, len))
+ return -EFAULT;
+
+ return 0;
+}
+
static ssize_t copy_event_to_user(struct fsnotify_group *group,
struct fsnotify_event *fsn_event,
char __user *buf, size_t count)
@@ -197,6 +261,8 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
fd = create_fd(group, event, &f);
if (fd < 0)
return fd;
+ } else if (fanotify_event_has_fid(event)) {
+ metadata.event_len += fanotify_event_info_len(event);
}
metadata.fd = fd;
@@ -208,14 +274,20 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
if (WARN_ON_ONCE(metadata.event_len > count))
goto out_close_fd;
- if (copy_to_user(buf, &metadata, metadata.event_len))
+ if (copy_to_user(buf, &metadata, FAN_EVENT_METADATA_LEN))
goto out_close_fd;
if (fanotify_is_perm_event(event->mask))
FANOTIFY_PE(fsn_event)->fd = fd;
- if (fd != FAN_NOFD)
+ if (fanotify_event_has_path(event)) {
fd_install(fd, f);
+ } else if (fanotify_event_has_fid(event)) {
+ ret = copy_fid_to_user(event, buf + FAN_EVENT_METADATA_LEN);
+ if (ret < 0)
+ return ret;
+ }
+
return metadata.event_len;
out_close_fd: