tracing: Fix pid filtering when triggers are attached

commit a55f224ff5f238013de8762c4287117e47b86e22 upstream.

If a event is filtered by pid and a trigger that requires processing of
the event to happen is a attached to the event, the discard portion does
not take the pid filtering into account, and the event will then be
recorded when it should not have been.

Cc: stable@vger.kernel.org
Fixes: 3fdaf80f4a836 ("tracing: Implement event pid filtering")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 15a811d..8d67f7f 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1506,14 +1506,26 @@ __event_trigger_test_discard(struct trace_event_file *file,
        if (eflags & EVENT_FILE_FL_TRIGGER_COND)
                *tt = event_triggers_call(file, entry, event);
 
-       if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
-           (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
-            !filter_match_preds(file->filter, entry))) {
-               __trace_event_discard_commit(buffer, event);
-               return true;
-       }
+       if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED |
+                                   EVENT_FILE_FL_FILTERED |
+                                   EVENT_FILE_FL_PID_FILTER))))
+               return false;
+
+       if (file->flags & EVENT_FILE_FL_SOFT_DISABLED)
+               goto discard;
+
+       if (file->flags & EVENT_FILE_FL_FILTERED &&
+           !filter_match_preds(file->filter, entry))
+               goto discard;
+
+       if ((file->flags & EVENT_FILE_FL_PID_FILTER) &&
+           trace_event_ignore_this_pid(file))
+               goto discard;
 
        return false;
+ discard:
+       __trace_event_discard_commit(buffer, event);
+       return true;
 }
 
 /**