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nondeterministic symbols relocation

From: Giuseppe Scrivano
Subject: nondeterministic symbols relocation
Date: Wed, 27 May 2009 21:48:28 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.94 (gnu/linux)

Hi everybody,

I noticed that ld relocates symbols assigning them always the same
values in a deterministic way.  I am quite sure this is the desired
behaviour but wouldn't be better to add a bit of randomness?
Buffer overflow exploits can take advantage to know in advance the
position of a symbol, it will not solve completely the problem but
surely it will make things harder.

Does something similar already exist?  Is it a reasonable idea?


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