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Re: [Axiom-developer] Re: [Gcl-devel] [Re: Executable memory: further pr

From: Camm Maguire
Subject: Re: [Axiom-developer] Re: [Gcl-devel] [Re: Executable memory: further programs that fail]
Date: 02 Dec 2003 12:13:10 -0500
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2


root <address@hidden> writes:

> >Just wanted to point out here that a randomization of this magnitude,
> >even if gcl can work around it, could potentially result in a loss of
> >100M in usable memory on each save-system.  I think axiom currently
> >uses about 4 of these.  The default memory maximum for GCL is only
> >128M.  Count me among the elders :-).
> Is there any way to get GCL to use all available memory? Fedora will
> let you address 4G so Roland doesn't understand why I cry about 100M.

Sure, --enable-maxpage should let you go as high as you want.  I can't
imagine there not being serious performance issues, but I could be

> >If you recall, static linking was broken even without exec-shield.  I
> >think if brk randomization remains at the above mentioned range, we
> >would probably fall back on Roland's linker script solution, if I
> >understand correctly. 
> I don't understand Roland's linker solution.

Me either, but sounded promising :-).

> >OK, your understanding is considerably deeper than mine on this
> >issue.  Even granting some security benefit, though, I don't see why
> >the range can't be quite small and still be effective.  How long would
> >it take someone to guess a randomly generated address in even a 1k
> >range? 
> The issue is the same at 1k vs 100M but the latter sounds so much more
> secure :-)


Take care,

> Tim

Camm Maguire                                            address@hidden
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah

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