linux-kernel - Re: [PATCH 2/3] perf tools: Fix build for hardened environments

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Date:   Wed, 29 Nov 2017 16:54:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 2/3] perf tools: Fix build for hardened environments

Em Fri, Nov 10, 2017 at 10:43:25AM +0100, Jiri Olsa escreveu:
> On Thu, Nov 09, 2017 at 09:52:12AM -0300, Arnaldo Carvalho de Melo wrote:
> > Right, since we want to honour what the distro makers decided was the
> > best set for them, and to be able to link with other libraries, etc.

> > But then I think this should be done more explicitely, right? Do you
> > envision some way to do that without having to try to build perl or
> > python, that may not be installed, etc?

> I'll check on it.. I think we could use feature detection and
> enable that by default and add NO_HARDENED_BUILD variable as
> we do for features.. and detect that python/perl or whatever
> else is using that and warn
 
> > Of course users wanting to use something different may just set CFLAGS
> > and be done with it, in which case I think this should also affect the
> > perl and python CFLAGS, removing that distro specific stuff since the
> > user is changing something different.
 
> yep

Even with this patch applied, as a stopgap solution to allow me to build
a full featured tool on f27, I get this leftover:

  LINK     /tmp/build/perf/perf
/usr/bin/ld: /tmp/build/perf/libperf.a(libperf-in.o): relocation R_X86_64_32S against symbol `inat_primary_table' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status


Looking at the Intel PT bits now...

- Arnaldo