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

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Date:   Wed, 22 Feb 2017 20:29:17 -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 Wed, Feb 22, 2017 at 08:23:29PM -0300, Arnaldo Carvalho de Melo escreveu:
> 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.

Tomorrow I'll inject some refcount errors to test this all.

- Arnaldo