Messages in this thread | | | Date | Mon, 26 Aug 2013 15:49:24 -0400 | From | Dave Jones <> | Subject | Re: suspicious RCU usage (perf) |
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On Mon, Aug 26, 2013 at 01:43:15PM -0600, David Ahern wrote: > On 8/26/13 12:29 PM, Dave Jones wrote: > > On Mon, Aug 26, 2013 at 02:18:14PM -0400, Steven Rostedt wrote: > > > On Mon, 26 Aug 2013 13:50:12 -0400 > > > Dave Jones <davej@redhat.com> wrote: > > > > > > > > This was triggered as a regular user fwiw. > > > > I had not been running perf, or any other tracing. It was just left > > > > fuzzing over the weekend with no interaction at all. > > > > > > So you are telling me that ftrace was enabled by a regular user? If so, > > > that's a huge issue. > > > > quite. > > > > > So my question to you. If you were not running perf or any other > > > tracing, and this is all just non-root user. How the hell did perf > > > function tracing get started on your box???? > > > > What mechanisms are available that would trigger it being enabled ? > > > > Is there some path through sys_perf_open_event that might be > > missing a capability check perhaps ? > > Do you have /sys/kernel/debug with access permissions?
Ah, yeah, that'll be it. Good catch.
Sorry for the false alarm Steve ;)
Dave
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