tracing: Fix race between deleting buffer and setting events

commit 2a6c24afab70dbcfee49f4c76e1511eec1a3298b upstream.

While analyzing the code, I discovered that there's a potential race between
deleting a trace instance and setting events. There are a few races that can
occur if events are being traced as the buffer is being deleted. Mostly the
problem comes with freeing the descriptor used by the trace event callback.
To prevent problems like this, the events are disabled before the buffer is
deleted. The problem with the current solution is that the event_mutex is let
go between disabling the events and freeing the files, which means that the events
could be enabled again while the freeing takes place.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 17 insertions, 6 deletions

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index f82d92dbd614..32b9895af239 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -415,14 +415,14 @@ static void put_system(struct ftrace_subsystem_dir *dir)
 /*
  * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
  */
-static int __ftrace_set_clr_event(struct trace_array *tr, const char *match,
-                                  const char *sub, const char *event, int set)
+static int
+__ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match,
+                              const char *sub, const char *event, int set)
 {
         struct ftrace_event_file *file;
         struct ftrace_event_call *call;
         int ret = -EINVAL;
 
-        mutex_lock(&event_mutex);
         list_for_each_entry(file, &tr->events, list) {
 
                 call = file->event_call;
@@ -448,6 +448,17 @@ static int __ftrace_set_clr_event(struct trace_array *tr, const char *match,
 
                 ret = 0;
         }
+
+        return ret;
+}
+
+static int __ftrace_set_clr_event(struct trace_array *tr, const char *match,
+                                  const char *sub, const char *event, int set)
+{
+        int ret;
+
+        mutex_lock(&event_mutex);
+        ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set);
         mutex_unlock(&event_mutex);
 
         return ret;
@@ -2367,11 +2378,11 @@ early_event_add_tracer(struct dentry *parent, struct trace_array *tr)
 
 int event_trace_del_tracer(struct trace_array *tr)
 {
-        /* Disable any running events */
-        __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0);
-
         mutex_lock(&event_mutex);
 
+        /* Disable any running events */
+        __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0);
+
         down_write(&trace_event_sem);
         __trace_remove_event_dirs(tr);
         debugfs_remove_recursive(tr->event_dir);