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Message-ID: <CALoOobP1ZMj222dXwA_EucGGOpN9fJxHDKfAM5krTyk2BfXVDg@mail.gmail.com>
Date: Fri, 5 Dec 2014 14:03:25 -0800
From: Paul Pluzhnikov <ppluzhnikov@...il.com>
To: oss-security@...ts.openwall.com
Cc: Sriraman Tallam <tmsriram@...gle.com>
Subject: Re: Offset2lib: bypassing full ASLR on 64bit Linux
On Fri, Dec 5, 2014 at 1:07 PM, Hanno Böck <hanno@...eck.de> wrote:
>
> On Fri, 05 Dec 2014 15:55:27 -0500
> Daniel Micay <danielmicay@...il.com> wrote:
>
> > The context of the architecture you're testing on is required for the
> > numbers to be meaningful. It's known to be expensive on x86 and should
> > be nearly free elsewhere if there aren't compiler / linker perf bugs.
FWIW, we've measured 1-2.5% degradation in our highly-optimized x86_64
binaries, and Sri's patch avoids most of it.
Sri also tells me that H.J. Lu committed a patch for pie+copyrelocs to
GNU-ld, and made the GCC copyreloc optimization (which has been
committed) the default when linker support is available.
--
Paul Pluzhnikov
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