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Re: GRUB2 Build on Mac OS X

From: Marco Gerards
Subject: Re: GRUB2 Build on Mac OS X
Date: Sat, 10 Dec 2005 00:32:53 +0100
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux)

Peter Jones <address@hidden> writes:

>> Would be alright if we could enable execute permission only on the specific 
>> pages needed (as known by GCC)? GCC provides an ENABLE_EXECUTE_STACK macro, 
>> but it seems that is not currently used on Linux. It is used on the various 
>> BSDs.
> It would be functional, but again we'd have security concerns.
> Sure, we're maybe being a little paranoid, but "they" really are out to
> get us, and being paranoid has worked very well for us so far.

Wouldn't it be possible to use some other memory than the stack to
implement trampolines?  It's documented quite well:

Anyways, my primary concerns are making things work and moving
forwards to something that is releasable.  Making GRUB work in a way
so it works like everyone wants is secondary and not possible in
practice.  Paranoid security is secondary to me, but if we can get it
for free without making a mess of the code, that would be great.


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