From: Arnd Bergmann <arnd@arndb.de>
To: "Michał Mirosław" <mirqus@gmail.com>
Cc: John Calixto <john.calixto@modsystems.com>,
linux-mmc@vger.kernel.org, cjb@laptop.org
Subject: Re: [PATCH resend] mmc: Added ioctl to let userspace apps send ACMDs
Date: Fri, 18 Mar 2011 20:26:48 +0100 [thread overview]
Message-ID: <201103182026.48939.arnd@arndb.de> (raw)
In-Reply-To: <AANLkTimjssCz_U4xbSf+ecoM7RsjC3eGQBo2vabfyy=T@mail.gmail.com>
On Friday 18 March 2011 18:56:53 Michał Mirosław wrote:
> If that's going to be used by possibly unprivileged userspace process,
> then this passthrough should filter and validate all commands it
> passes to hardware. If there is a possibility of some command sequence
> to generate undefined or otherwise unwanted results, then you need
> state tracker that will disallow that sequence to be generated by
> unprivileged process.
We have precedence for direct host commands in a few other
block drivers. In general, any user who can open the block
device can issue all commands unless they can directly destroy
the hardware. On normal systems, the only user that has write
access to block devices is root.
Arnd
next prev parent reply other threads:[~2011-03-18 19:26 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-17 18:28 [PATCH resend] mmc: Added ioctl to let userspace apps send ACMDs John Calixto
2011-03-17 18:35 ` Ben Dooks
2011-03-17 21:55 ` Arnd Bergmann
2011-03-18 17:32 ` John Calixto
2011-03-18 17:56 ` Michał Mirosław
2011-03-18 19:26 ` Arnd Bergmann [this message]
2011-03-19 17:36 ` Michał Mirosław
2011-03-19 19:00 ` Arnd Bergmann
2011-03-21 18:37 ` John Calixto
2011-03-21 23:16 ` Michał Mirosław
2011-03-22 22:31 ` John Calixto
2011-03-23 0:18 ` Michał Mirosław
2011-03-23 0:44 ` John Calixto
2011-03-23 7:57 ` Arnd Bergmann
2011-03-18 19:25 ` Arnd Bergmann
2011-03-18 22:06 ` [PATCH resend] mmc: Added ioctl to let userspace apps send ACMD John Calixto
2011-03-19 11:52 ` Arnd Bergmann
2011-03-20 2:12 ` John Calixto
2011-03-20 5:11 ` Michał Mirosław
2011-03-21 12:25 ` Arnd Bergmann
2011-03-21 14:26 ` Andrei Warkentin
2011-03-21 18:22 ` John Calixto
2011-03-19 0:24 ` [PATCH resend] mmc: Added ioctl to let userspace apps send ACMDs John Calixto
2011-03-19 9:42 ` Arnd Bergmann
2011-03-19 16:09 ` Chris Ball
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