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Re: Bits from dpkg developers - dpkg 1.16.1

Le Tue, Sep 27, 2011 at 06:01:54PM -0700, Kees Cook a écrit :
> On Fri, Sep 23, 2011 at 08:17:54AM +0200, Raphael Hertzog wrote:
> >   Two hardening features are not enabled by default: PIE and bindnow.
> >   If your package supports PIE, you might want to consider enabling it.
> >   If the binaries are long running processes like daemons, and as such
> >   the startup performance penalty of “bindnow” is acceptable, it might
> >   be a good idea to enable it too but only if relro is in effect,
> >   although another option might be to just define LD_BIND_NOW=1 on the
> >   daemon's environment (for example in the init.d script), in which case
> >   the sysadmin can always disable it, something that's not possible with
> >   the build option.
> Just to be explicit, PIE tends to have small (<1%) performance hits on
> register-starved architectures (i386) in most cases, for for certain work
> loads (e.g. python) the hit is large (~15%). On architectures with plenty
> of registers (amd64) there's virtually no measurable performance hit that
> I've seen.

By the way – and please pardon me if it is a too naive question – does this
recommendation of building packages with PIE when possible make obsolete the
recommendation of Policy's §10.2 to not build static libraries with -fPIC ?


Have a nice day,

Charles Plessy
Tsurumi, Kanagawa, Japan

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