From: Michael Buesch <mb@bu3sch.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Really good idea to allow mmap(0, FIXED)?
Date: Fri, 6 Oct 2006 16:44:32 +0200 [thread overview]
Message-ID: <200610061644.33267.mb@bu3sch.de> (raw)
In-Reply-To: <1160085480.1607.32.camel@localhost.localdomain>
On Thursday 05 October 2006 23:58, Alan Cox wrote:
> Ar Iau, 2006-10-05 am 20:59 +0200, ysgrifennodd Michael Buesch:
> > Is is really a good idea to allow processes to remap something
> > to address 0?
>
> It is very useful indeed. Consider for example dosemu.
Ok, good point.
> > Besides that, I currently don't see a valid reason to mmap address 0.
> >
> > Comments?
>
> User zero is not neccessarily mapped at kernel zero so your argument
> isn't portable either.
Eh, so what about the following.
We _have_ arches which map user zero to kernel zero. What about
specialcasing that on a per-arch case. So remapping user zero to
something else in kernel.
--
Greetings Michael.
next prev parent reply other threads:[~2006-10-06 14:44 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-05 18:59 Really good idea to allow mmap(0, FIXED)? Michael Buesch
2006-10-05 19:50 ` linux-os (Dick Johnson)
2006-10-06 14:40 ` Michael Buesch
2006-10-05 21:58 ` Alan Cox
2006-10-06 14:44 ` Michael Buesch [this message]
2006-10-07 11:23 ` Pavel Machek
2006-10-05 23:55 ` David Wagner
2006-10-06 4:34 ` Jeremy Fitzhardinge
2006-10-06 5:39 ` Jan Engelhardt
2006-10-06 19:47 ` David Wagner
2006-10-06 7:25 ` Arjan van de Ven
2006-10-06 10:36 ` Mikael Pettersson
2006-10-06 11:20 ` Arjan van de Ven
2006-10-06 19:43 ` David Wagner
2006-10-08 0:22 ` Jeremy Fitzhardinge
2006-10-08 2:03 ` David Wagner
2006-10-08 19:18 ` Michael Buesch
2006-10-06 14:55 ` Michael Buesch
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200610061644.33267.mb@bu3sch.de \
--to=mb@bu3sch.de \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox