linux-kernel - Re: [PATCH][RESEND] PIE randomization

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Message-ID: <a36005b50705111541s823eefp105e7284923fac45@mail.gmail.com>
Date:	Fri, 11 May 2007 15:41:18 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Jiri Kosina" <jkosina@...e.cz>, "Jan Kratochvil" <honza@...os.cz>,
	"Ingo Molnar" <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RESEND] PIE randomization

On 5/11/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> erm, I was being funny.  If you randomize a binary it won't run any more.
> cp /dev/random /bin/login.  Oh well.
>
> My point is, we're not being told what is being randomized here.  Is it the
> virtual starting address of the main executable mmap?  Of the shared
> libraries also?  Is it the stack location?  What?

PIE = Position Independent Executable, that's how I named them.

These are not regular executables, they are basically DSOs but usually
compiled with -fpie/-fPIE instead of -fpic/-fPIC and linked with -pie
instead of -shared to allow the compiled and linker perform more
optimizations.

See section 5 in

  http://people.redhat.com/drepper/nonselsec.pdf

Jan unfortunately Ingo's document which doesn't really explain it.
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