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Date: Fri, 6 Oct 2006 12:36:16 +0200
From: Mikael Pettersson <mikpe@it.uu.se>
To: Arjan van de Ven <arjan@infradead.org>
Cc: David Wagner <daw-usenet@taverner.cs.berkeley.edu>,
       linux-kernel@vger.kernel.org
Subject: Re: Really good idea to allow mmap(0, FIXED)?
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Arjan van de Ven writes:
 > >     mmap(0, 4096, PROT_READ|PROT_EXEC|PROT_WRITE,
 > >         MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
 > >     struct s *bar = 0;
 > 
 > the question isn't if it's a good idea to allow mmap(0) but to allow
 > mmap PROT_WRITE | PROT_EXEC !

It is if you want JITs, code loaders, virtualisation engines, etc
to continue working.