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Re: MMIO regions

To: Rik Faith <faith@precisioninsight.com>
Subject: Re: MMIO regions
From: James Simmons <jsimmons@edgeglobal.com>
Date: Sun, 10 Oct 1999 20:21:15 -0400 (EDT)
cc: "Eric W. Biederman" <ebiederm+eric@ccr.net>, Linux MM <linux-mm@kvack.org>
In-Reply-To: <14336.53971.896012.84699@light.alephnull.com>
Sender: owner-linux-mm@kvack.org

> No.  The DRI assumes that direct-rendering clients are running as non-root
> users.  A direct-rendering client, with an open connection to the X server,
> is allowed to mmap the MMIO region via a special device (additional
> restrictions also apply).  For more information, please see "A Security
> Analysis of the Direct Rendering Infrastructure"
> (http://precisioninsight.com/dr/security.html).

> Just to clarify, the DRI does _not_ require that clients be SUID.

Oh my. Non root and direct access to buggy hardware. 

Yeah since your familar with SGI can you explain to me the use of 
/dev/shmiq, /dev/qcntl and /dev/usemaclone. I have seen them used for the
X server on IRIX and was just interested to see if they could be of use on
other platforms. Yes SGI linux supports these.

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References:
- Re: MMIO regions
  - From: Rik Faith <faith@precisioninsight.com>

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