linux-kernel - Re: [PATCH 0/9] tools subsystem refcounter conversions

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Date:   Wed, 22 Feb 2017 20:23:29 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Elena Reshetova <elena.reshetova@...el.com>
Cc:     linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        peterz@...radead.org, gregkh@...uxfoundation.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        mark.rutland@....com, akpm@...ux-foundation.org,
        matija.glavinic-pecotic.ext@...ia.com
Subject: Re: [PATCH 0/9] tools subsystem refcounter conversions

Em Tue, Feb 21, 2017 at 12:39:35PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Feb 21, 2017 at 05:34:54PM +0200, Elena Reshetova escreveu:
> > Now when new refcount_t type and API are finally merged
> > (see include/linux/refcount.h), the following
> > patches convert various refcounters in the tools susystem from atomic_t
> > to refcount_t. By doing this we prevent intentional or accidental
> > underflows or overflows that can led to use-after-free vulnerabilities.
> 
> Thanks for working on this! I was almost going to jump on doing this
> myself!
> 
> I'll try and get this merged ASAP.

So, please take a look at my tmp.perf/refcount branch at:

git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git

There are multiple fixes in it to get it to build and test it, so far,
with:

  perf top -F 15000 -d 0

while doing kernel builds and tight usleep 1 loops to create lots of
short lived threads with its map_groups, maps, dsos, etc.

Now running some build tests in some 36 containers with assorted distros
and cross compilers.

- Arnaldo