linux-kernel - Re: revert PIE randomization?

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Message-ID: <20070321181730.GV22797@outflux.net>
Date:	Wed, 21 Mar 2007 11:17:30 -0700
From:	Kees Cook <kees@...flux.net>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Andrew Morton <akpm@...l.org>, Linus Torvalds <torvalds@...l.org>,
	Marcus Meissner <meissner@...e.de>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	Dave Jones <davej@...emonkey.org.uk>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: revert PIE randomization?

Hi Hugh,

Hugh Dickins said:
> Inconsistency detected by ld.so: rtld.c: 1217: dl_main:
>  Assertion `_rtld_local._dl_rtld_map.l_libname' failed!

I'm trying to reproduce the problem you saw (so that I can then test 
your proposed fix).  However, I haven't had any luck.  I've got a 
pie-compiled version of bash, and I've been running it in a loop for a 
while now with the original randomization patch.  (I can clearly see the 
base address bouncing around.)

I'm at just over 10 million exec's, and I haven't hit the problem.  :(

Do you have any clues on how to trigger this more reliably?

Also, does anyone have any thoughts on why x86 uses a ELF_ET_DYN_BASE 
below the libraries, where as x86_64 uses one above them?  From this, 
I'd expect x86_64 to collide with the libraries at times.  I need more 
help understanding the memory layouts, I guess.  :)

Thanks,

-- 
Kees Cook                                            @outflux.net
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