Re: perf: out-of-bounds write in perf_callchain_store

[Peter Zijlstra]

On Tue, Sep 06, 2016 at 04:49:29PM +0200, Dmitry Vyukov wrote:
> On Tue, Sep 6, 2016 at 4:44 PM, Arnaldo Carvalho de Melo
> > I looked at it briefly some moments ago, couldn't find it so far, have
> > to look at what was behind adding a sysctl for that :-\
> >
> > And yeah, that entry/ctx thing, IIRC, was done to reduce patch size,
> > probably needs some polishing to become clearer.
> 
> 
> I believe fuzzer wasn't messing with sysctl's.
> But, yeah, I guess it's really bad idea to try to change them on a
> running system.

The sysctl's should return -EBUSY if its in use...