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Date: Thu, 1 Jul 2004 15:50:04 +0100
From: Jamie Lokier <jamie@shareable.org>
To: Kyle Moffett <mrmacman_g4@mac.com>
Cc: William Lee Irwin III <wli@holomorphy.com>,
       Michael Kerrisk <michael.kerrisk@gmx.net>, linux-kernel@vger.kernel.org
Subject: Re: [OT] Testing PROT_NONE and other protections, and a surprise
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References: <20040630024434.GA25064@mail.shareable.org> <20040630033841.GC21066@holomorphy.com> <20040701032606.GA1564@mail.shareable.org> <00345FCC-CB11-11D8-947A-000393ACC76E@mac.com> <20040701041158.GE1564@mail.shareable.org> <736E7483-CB1B-11D8-947A-000393ACC76E@mac.com> <20040701123941.GC4187@mail.shareable.org> <F64265B6-CB6C-11D8-947A-000393ACC76E@mac.com>
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Kyle Moffett wrote:
> >The error code is -1, aka. MAP_FAILED.
> Oops!  I guess I was just lucky that part didn't fail :-D On the
> other hand, it couldn't legally return 0 anyway, could it?

Yes it could -- if you request a mapping at address 0 with MAP_FIXED.
A few OSes won't do that, but Linux and many others will.

-- Jamie