Re: how to write paxctl MPROTECT-safe JIT code?

To: current-users%NetBSD.org@localhost
Subject: Re: how to write paxctl MPROTECT-safe JIT code?
From: Joerg Sonnenberger <joerg%bec.de@localhost>
Date: Tue, 15 Nov 2016 13:42:56 +0100

On Tue, Nov 15, 2016 at 12:34:14PM +0100, Thomas Klausner wrote:
> I've filed some upstream bug reports about paxctl issues, some existed
> already.
> 
> One developer asks how to fix the issue:
> 
> https://bugs.exim.org/show_bug.cgi?id=1749
> 
> Can someone please help out here?

The only safe and performant way I know is to create a temporary file,
unlink it and mmap it twice via the fd. It's a PITA.

Joerg

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