linux-kernel - Re: [PATCH] Undo some of the pseudo-security madness

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Message-ID: <87d53z1x8x.fsf@mid.deneb.enyo.de>
Date:	Sat, 24 Feb 2007 14:49:34 +0100
From:	Florian Weimer <fw@...eb.enyo.de>
To:	Samium Gromoff <_deepfire@...lingofgreen.ru>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	David Wagner <daw-usenet@...erner.cs.berkeley.edu>,
	LKML Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Undo some of the pseudo-security madness

* Samium Gromoff:

>> > Lisp environments can produce standalone executables
>> 
>> If you've got a stand-alone executable, you don't need MAP_FIXED.  The
>> ELF loader maps the program at a fixed address anyway (at least on
>> i386 and x86_64, I haven't checked others).
>
> Not so.
>
> The thing is that the picture is of two pieces:
>
>  - the executable
>  - the unrelocatable lisp core (which is unrelocatable by the virtue
>    of non-PIC code) which is mapped into the AS of the executable.
>
> It is the latter which breaks, as its map can overlap with randomized
> pieces of the executable (along with its libraries).

I think it boils down to the question if you can use ELF relocations
to create a relocatable (but not necessarily position-independent)
object that ld can link with the SBCL run-time system to produce an
executable.  This executable would truly be stand-alone because no
separate core file is required anymore.
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