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Re: dynamically written code problem

From: Paolo Bonzini <paolo dot bonzini at polimi dot it>
To: Jakub Jelinek <jakub at redhat dot com>
Cc: Paolo Bonzini <bonzini at gnu dot org>, Bob Wilkinson <bob dot wilkinson at sbcglobal dot net>, gcc at gcc dot gnu dot org
Date: Mon, 11 Oct 2004 09:38:41 +0200
Subject: Re: dynamically written code problem
References: <002801c4af13$83537260$6401a8c0@bwdesk> <416A3480.5020409@gnu.org> <20041011072528.GL30497@sunsite.ms.mff.cuni.cz>

2) doing mmap (..., | PROT_EXEC, ...) is preferrable to allocating elsewhere
   and then mprotecting when using exec-shield - otherwise you lose
   execute protection for too many pages where it is not desirable

I don't have an exec-shield system, so I didn't research much on this. But on my system, mmap is allocating in the 0x40000000 range, and malloc is allocating at the brk (around 0x08000000). Is this different when exec-shield is activated?

Paolo

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References:
- dynamically written code problem
  - From: Bob Wilkinson
- Re: dynamically written code problem
  - From: Paolo Bonzini
- Re: dynamically written code problem
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