linux-kernel - Re: [PATCH][RESEND] PIE randomization

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Message-ID: <Pine.LNX.4.64.0705120048230.11493@jikos.suse.cz>
Date:	Sat, 12 May 2007 01:50:16 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jan Kratochvil <honza@...os.cz>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RESEND] PIE randomization

On Fri, 11 May 2007, Andrew Morton wrote:

> I could reverse-engineer that info from the patch, I guess, but I'd 
> prefer to go in the opposite direction: you tell us what the patch is 
> trying to do, then we look at it and see if we agree that it is in fact 
> doing that.

I've just quickly looked at the patch and it seems fine - it's using 
mmap()'s randomization functionality in such a way that it maps the the 
main executable of (specially compiled/linked) ET_DYN binaries onto a 
random address (in cases in which mmap() is allowed to perform a 
randomization). Which is what we want, I'd guess.

Jan, would you care to update the patch with proper Changelog entry?

However, I seem to get "soft" hang on boot with this patch, approximately 
at the time the init should be executed. The system is not completely 
stuck - interrupts are delivered, keyboard is working, alt-sysrq-t dumps 
proper output, but userspace doesn't seem to get started. This happens on 
i386, didn't try on other archs.

-- 
Jiri Kosina
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