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

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: perf: out-of-bounds write in perf_callchain_store
Date	2016-09-06 18:10 +0200
Message-ID	<ser6G-4cc-11@gated-at.bofh.it> (permalink)
References	<seoVd-2EA-45@gated-at.bofh.it> <sepHz-3dy-1@gated-at.bofh.it> <sepRg-3ha-33@gated-at.bofh.it> <sepRg-3ha-31@gated-at.bofh.it>
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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...

Thread

perf: out-of-bounds write in perf_callchain_store Dmitry Vyukov <dvyukov@google.com> - 2016-09-06 15:50 +0200
  Re: perf: out-of-bounds write in perf_callchain_store Peter Zijlstra <peterz@infradead.org> - 2016-09-06 16:40 +0200
    Re: perf: out-of-bounds write in perf_callchain_store Dmitry Vyukov <dvyukov@google.com> - 2016-09-06 16:50 +0200
      Re: perf: out-of-bounds write in perf_callchain_store Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-06 17:10 +0200
        Re: perf: out-of-bounds write in perf_callchain_store Dmitry Vyukov <dvyukov@google.com> - 2016-09-06 17:20 +0200
      Re: perf: out-of-bounds write in perf_callchain_store Peter Zijlstra <peterz@infradead.org> - 2016-09-06 18:10 +0200
    Re: perf: out-of-bounds write in perf_callchain_store Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-06 16:50 +0200

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