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authorPeter Zijlstra <peterz@infradead.org>2013-11-14 16:23:04 +0100
committerIngo Molnar <mingo@kernel.org>2013-11-19 16:57:40 +0100
commitd5b5f391d434c5cc8bcb1ab2d759738797b85f52 (patch)
tree9be9680fd08dd943cac38b278dde12d83b4a9856 /include/linux/tracepoint.h
parent801a76050bcf8d4e500eb8d048ff6265f37a61c8 (diff)
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ftrace, perf: Avoid infinite event generation loop
Vince's perf-trinity fuzzer found yet another 'interesting' problem. When we sample the irq_work_exit tracepoint with period==1 (or PERF_SAMPLE_PERIOD) and we add an fasync SIGNAL handler we create an infinite event generation loop: ,-> <IPI> | irq_work_exit() -> | trace_irq_work_exit() -> | ... | __perf_event_overflow() -> (due to fasync) | irq_work_queue() -> (irq_work_list must be empty) '--------- arch_irq_work_raise() Similar things can happen due to regular poll() wakeups if we exceed the ring-buffer wakeup watermark, or have an event_limit. To avoid this, dis-allow sampling this particular tracepoint. In order to achieve this, create a special perf_perm function pointer for each event and call this (when set) on trying to create a tracepoint perf event. [ roasted: use expr... to allow for ',' in your expression ] Reported-by: Vince Weaver <vincent.weaver@maine.edu> Tested-by: Vince Weaver <vincent.weaver@maine.edu> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Dave Jones <davej@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20131114152304.GC5364@laptop.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/tracepoint.h')
-rw-r--r--include/linux/tracepoint.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index ebeab360d851..f16dc0a40049 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -267,6 +267,8 @@ static inline void tracepoint_synchronize_unregister(void)
#define TRACE_EVENT_FLAGS(event, flag)
+#define TRACE_EVENT_PERF_PERM(event, expr...)
+
#endif /* DECLARE_TRACE */
#ifndef TRACE_EVENT
@@ -399,4 +401,6 @@ static inline void tracepoint_synchronize_unregister(void)
#define TRACE_EVENT_FLAGS(event, flag)
+#define TRACE_EVENT_PERF_PERM(event, expr...)
+
#endif /* ifdef TRACE_EVENT (see note above) */