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Date: Fri, 5 Dec 2014 14:03:25 -0800
From: Paul Pluzhnikov <>
Cc: Sriraman Tallam <>
Subject: Re: Offset2lib: bypassing full ASLR on 64bit Linux

On Fri, Dec 5, 2014 at 1:07 PM, Hanno Böck <> wrote:
> On Fri, 05 Dec 2014 15:55:27 -0500
> Daniel Micay <> 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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