linux-kernel - Re: [patch] remove MNT_NOEXEC check for PROT

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Message-ID: <20061004134122.GA3789@ccure.user-mode-linux.org>
Date:	Wed, 4 Oct 2006 09:41:22 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	David Wagner <daw-usenet@...erner.cs.berkeley.edu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps

On Wed, Oct 04, 2006 at 03:17:59AM +0000, David Wagner wrote:
> To be honest, I still don't think you've answered Arjan's question.  Ok,
> so you say it is not a library and not a binary.  So what is it that you
> are maping in as executable, and why do you think it is reasonable to
> ask the Linux kernel to allow you to execute it, if it lives on a noexec
> partition?

He mentioned UML as being one thing affected by this.  In this case, you
can think of it as generating code in a piece of shared memory and
then executing it.  In reality, the code is read from disk rather than
being generated internally, and it's executed in a different process,
so it needs to be MAP_SHARED.

				Jeff
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