diff options
| author | Jiri Olsa <[email protected]> | 2014-03-02 16:56:39 +0100 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2014-03-11 11:57:58 +0100 |
| commit | 63c45f4ba533e9749da16298db53e491c25d805b (patch) | |
| tree | b3fce35edf1f68221b7487ea729df4e2ef5c3145 | |
| parent | cfa77bc4af2c75c0781ee76cde2dd104c6c8e2b7 (diff) | |
perf: Disallow user-space stack dumps for function trace events
Recent issues with user space callchains processing within
page fault handler tracing showed as Peter said 'there's
just too much fail surface'.
The user space stack dump is just another source of the this issue.
Related list discussions:
http://marc.info/?t=139302086500001&r=1&w=2
http://marc.info/?t=139301437300003&r=1&w=2
Suggested-by: Peter Zijlstra <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Vince Weaver <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | kernel/trace/trace_event_perf.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c index d5e01c3f4e69..c894614de14d 100644 --- a/kernel/trace/trace_event_perf.c +++ b/kernel/trace/trace_event_perf.c @@ -42,6 +42,13 @@ static int perf_trace_event_perm(struct ftrace_event_call *tp_event, */ if (!p_event->attr.exclude_callchain_user) return -EINVAL; + + /* + * Same reason to disable user stack dump as for user space + * callchains above. + */ + if (p_event->attr.sample_type & PERF_SAMPLE_STACK_USER) + return -EINVAL; } /* No tracing, just counting, so no obvious leak */ |