eventfs: Update all the eventfs_inodes from the events descriptor

The change to update the permissions of the eventfs_inode had the
misconception that using the tracefs_inode would find all the
eventfs_inodes that have been updated and reset them on remount.
The problem with this approach is that the eventfs_inodes are freed when
they are no longer used (basically the reason the eventfs system exists).
When they are freed, the updated eventfs_inodes are not reset on a remount
because their tracefs_inodes have been freed.

Instead, since the events directory eventfs_inode always has a
tracefs_inode pointing to it (it is not freed when finished), and the
events directory has a link to all its children, have the
eventfs_remount() function only operate on the events eventfs_inode and
have it descend into its children updating their uid and gids.

Link: https://lore.kernel.org/all/CAK7LNARXgaWw3kH9JgrnH4vK6fr8LDkNKf3wq8NhMWJrVwJyVQ@mail.gmail.com/
Link: https://lore.kernel.org/linux-trace-kernel/20240523051539.754424703@goodmis.org

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Fixes: baa23a8 ("tracefs: Reset permissions on remount if permissions are options")
Reported-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

fs/tracefs/event_inode.c

@@ -305,27 +305,27 @@ static const struct file_operations eventfs_file_operations = {
  .llseek = generic_file_llseek,
 };
 
-/*
- * On a remount of tracefs, if UID or GID options are set, then
- * the mount point inode permissions should be used.
- * Reset the saved permission flags appropriately.
- */
-void eventfs_remount(struct tracefs_inode *ti, bool update_uid, bool update_gid)
+static void eventfs_set_attrs(struct eventfs_inode *ei, bool update_uid, kuid_t uid,
+ bool update_gid, kgid_t gid, int level)
 {
- struct eventfs_inode *ei = ti->private;
+ struct eventfs_inode *ei_child;
 
- if (!ei)
+ /* Update events/<system>/<event> */
+ if (WARN_ON_ONCE(level > 3))
  return;
 
  if (update_uid) {
  ei->attr.mode &= ~EVENTFS_SAVE_UID;
- ei->attr.uid = ti->vfs_inode.i_uid;
+ ei->attr.uid = uid;
  }
 
-
  if (update_gid) {
  ei->attr.mode &= ~EVENTFS_SAVE_GID;
- ei->attr.gid = ti->vfs_inode.i_gid;
+ ei->attr.gid = gid;
+ }
+
+ list_for_each_entry(ei_child, &ei->children, list) {
+ eventfs_set_attrs(ei_child, update_uid, uid, update_gid, gid, level + 1);
  }
 
  if (!ei->entry_attrs)
@@ -334,13 +334,31 @@ void eventfs_remount(struct tracefs_inode *ti, bool update_uid, bool update_gid)
  for (int i = 0; i < ei->nr_entries; i++) {
  if (update_uid) {
  ei->entry_attrs[i].mode &= ~EVENTFS_SAVE_UID;
- ei->entry_attrs[i].uid = ti->vfs_inode.i_uid;
+ ei->entry_attrs[i].uid = uid;
  }
  if (update_gid) {
  ei->entry_attrs[i].mode &= ~EVENTFS_SAVE_GID;
- ei->entry_attrs[i].gid = ti->vfs_inode.i_gid;
+ ei->entry_attrs[i].gid = gid;
  }
  }
+
+}
+
+/*
+ * On a remount of tracefs, if UID or GID options are set, then
+ * the mount point inode permissions should be used.
+ * Reset the saved permission flags appropriately.
+ */
+void eventfs_remount(struct tracefs_inode *ti, bool update_uid, bool update_gid)
+{
+ struct eventfs_inode *ei = ti->private;
+
+ /* Only the events directory does the updates */
+ if (!ei || !ei->is_events || ei->is_freed)
+ return;
+
+ eventfs_set_attrs(ei, update_uid, ti->vfs_inode.i_uid,
+ update_gid, ti->vfs_inode.i_gid, 0);
 }
 
 /* Return the evenfs_inode of the "events" directory */