Re: [GIT PULL] tracing: final fixes for events and some

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> On Mon, 12 Aug 2013 22:39:22 -0400
> Dave Jones <davej@xxxxxxxxxx> wrote:
> 
> 
> > I'm not sure why I got cc'd on this, but for my part, the perf/tracing 
> > related bugs I've found recently may have been there for ages, but 
> > they were triggerable as non-root users.
> 
> Which bug was able to trigger with non-root? The hash one that you 
> reported? That is something with the function tracer. Are you able to 
> enable function tracing as non-root?
> 
> Or is it because you gave more permissions for non-root to use extra 
> perf commands. Because no one but root should be able to enable function 
> tracing, as that can add a large overhead to the system.

Hm, also, tracepoints should in general only be accessible to root - all 
sorts of random privileged info leaks through tracepoints, a thorough 
review and sanitizing is needed to expose that to users. (and that does 
not consider the complication caused by exposing timing info.)

Thanks,

	Ingo
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