linux-kernel - Re: Really good idea to allow mmap(0, FIXED)?

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Message-ID: <17702.12704.868782.312125@alkaid.it.uu.se>
Date:	Fri, 6 Oct 2006 12:36:16 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	David Wagner <daw-usenet@...erner.cs.berkeley.edu>,
	linux-kernel@...r.kernel.org
Subject: Re: Really good idea to allow mmap(0, FIXED)?

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.
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