1 files changed, 12 insertions, 0 deletions

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 5d12bb407b44..4b9c114ee9de 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -30,6 +30,18 @@ static int perf_trace_event_perm(struct ftrace_event_call *tp_event,
                         return ret;
         }
 
+        /*
+         * We checked and allowed to create parent,
+         * allow children without checking.
+         */
+        if (p_event->parent)
+                return 0;
+
+        /*
+         * It's ok to check current process (owner) permissions in here,
+         * because code below is called only via perf_event_open syscall.
+         */
+
         /* The ftrace function trace is allowed only for root. */
         if (ftrace_event_is_function(tp_event)) {
                 if (perf_paranoid_tracepoint_raw() && !capable(CAP_SYS_ADMIN))