From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Hans-Jürgen Koch" <hjk@linutronix.de>
Cc: Valdis.Kletnieks@vt.edu, Jesper Juhl <jesper.juhl@gmail.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] UIO: Documentation
Date: Thu, 9 Aug 2007 15:12:20 +0100 [thread overview]
Message-ID: <20070809151220.3f389efc@the-village.bc.nu> (raw)
In-Reply-To: <200708091502.45417.hjk@linutronix.de>
> That's no UIO invention. Userspace software that uses kernel interfaces like
> syscall, device files, sysfs, and so on, is by definition _not_ a derived work
> of the kernel and can be distributed under any license.
This I believe incorrect. Please cite caselaw if you know better.
> With UIO, you have a kernel module that is so small, that even somebody who
> hasn't got the hardware can easily review it and tell if the code is OK or not.
> It is easy to maintain and doesn't reveal any secrets about the hardware.
False
Because you have no idea if the interface is correct or the userspace is
doing stuff like triggering DMA to arbitary addresses via the interface
or mmap functions. If it does so then even if its root only you've blown
your security model.
next prev parent reply other threads:[~2007-08-09 14:05 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-18 23:23 [GIT PATCH] UIO patches for 2.6.22 Greg KH
2007-07-18 23:26 ` [PATCH 1/3] UIO: Add the User IO core code Greg Kroah-Hartman
2007-07-18 23:26 ` [PATCH 2/3] UIO: Documentation Greg Kroah-Hartman
2007-07-18 23:26 ` [PATCH 3/3] UIO: Hilscher CIF card driver Greg Kroah-Hartman
2007-07-19 16:33 ` Jan Engelhardt
2007-07-19 19:28 ` Hans-Jürgen Koch
2007-07-19 20:02 ` Jan Engelhardt
2007-07-19 20:24 ` Hans-Jürgen Koch
2007-08-08 21:36 ` [PATCH 2/3] UIO: Documentation Jesper Juhl
2007-08-08 22:12 ` Valdis.Kletnieks
2007-08-08 23:03 ` Jesper Juhl
2007-08-09 7:19 ` Greg KH
2007-08-09 16:50 ` Jesper Juhl
2007-08-08 23:40 ` Alan Cox
2007-08-09 12:29 ` Hans-Jürgen Koch
2007-08-09 14:09 ` Alan Cox
2007-08-09 13:02 ` Hans-Jürgen Koch
2007-08-09 14:12 ` Alan Cox [this message]
2007-08-09 15:23 ` Hans-Jürgen Koch
2007-08-09 7:41 ` Hans-Jürgen Koch
-- strict thread matches above, loose matches on Subject: below --
2007-05-08 14:04 [GIT PATCH] UIO patches for 2.6.21 Greg KH
2007-05-08 14:08 ` [PATCH 1/3] UIO: Add the User IO core code Greg Kroah-Hartman
2007-05-08 14:08 ` [PATCH 2/3] UIO: Documentation Greg Kroah-Hartman
2007-04-27 22:49 [GIT PATCH] UIO patches for 2.6.21 Greg KH
2007-04-27 22:50 ` [PATCH 1/3] UIO: Add the User IO core code Greg Kroah-Hartman
2007-04-27 22:50 ` [PATCH 2/3] UIO: Documentation Greg Kroah-Hartman
2007-05-01 23:42 ` Randy Dunlap
2007-05-02 8:41 ` Hans-Jürgen Koch
2007-05-02 20:52 ` Randy Dunlap
2007-05-02 22:00 ` Hans-Jürgen Koch
2007-05-02 23:37 ` Randy Dunlap
2007-05-03 5:37 ` Greg KH
2007-05-03 6:39 ` Hans-Jürgen Koch
2007-05-04 9:37 ` Hans-Jürgen Koch
2007-05-07 17:46 ` Randy Dunlap
2007-05-07 20:01 ` Hans-Jürgen Koch
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