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Open Source and information security mailing list archives
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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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