From: "Ulrich Drepper" <drepper@gmail.com>
To: "Andrew Morton" <akpm@linux-foundation.org>
Cc: "Jiri Kosina" <jkosina@suse.cz>,
"Jan Kratochvil" <honza@jikos.cz>, "Ingo Molnar" <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH][RESEND] PIE randomization
Date: Fri, 11 May 2007 15:41:18 -0700 [thread overview]
Message-ID: <a36005b50705111541s823eefp105e7284923fac45@mail.gmail.com> (raw)
In-Reply-To: <20070511133651.63f8a14d.akpm@linux-foundation.org>
On 5/11/07, Andrew Morton <akpm@linux-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.
next prev parent reply other threads:[~2007-05-11 22:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-11 12:33 Jan Kratochvil
2007-05-11 19:56 ` Andrew Morton
2007-05-11 20:18 ` Jiri Kosina
2007-05-11 20:36 ` Andrew Morton
2007-05-11 22:41 ` Ulrich Drepper [this message]
2007-05-11 23:50 ` Jiri Kosina
2007-05-16 17:14 ` Jiri Kosina
2007-05-17 20:24 ` Jan Kratochvil
2007-05-17 21:50 ` Jiri Kosina
2007-05-18 17:29 ` Andrew Morton
2007-05-21 14:58 ` Hugh Dickins
2007-05-22 23:16 ` Andrew Morton
2007-05-23 8:50 ` Jiri Kosina
2007-07-04 8:25 ` Jakub Jelinek
2007-07-04 17:35 ` Jiri Kosina
2007-07-05 20:53 ` Chuck Ebbert
2007-07-05 20:57 ` Rik van Riel
2007-07-07 0:13 ` Jiri Kosina
2007-07-07 12:30 ` Jakub Jelinek
2007-07-09 11:41 ` Jiri Kosina
2007-07-09 21:58 ` Jiri Kosina
2007-07-10 9:47 ` Jakub Jelinek
2007-07-11 9:58 ` Jiri Kosina
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