Date: Sat, 12 May 2007 01:50:16 +0200 (CEST)
From: Jiri Kosina <jkosina@suse.cz>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jan Kratochvil <honza@jikos.cz>, Ingo Molnar <mingo@elte.hu>,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH][RESEND] PIE randomization
In-Reply-To: <20070511133651.63f8a14d.akpm@linux-foundation.org>
Message-ID: <Pine.LNX.4.64.0705120048230.11493@jikos.suse.cz>
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 <20070511125629.3df919cf.akpm@linux-foundation.org>
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 <20070511133651.63f8a14d.akpm@linux-foundation.org>
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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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