Using inb() and outb()
bonomi at mail.r-bonomi.com
Tue May 22 21:06:22 UTC 2012
> From owner-freebsd-questions at freebsd.org Tue May 22 15:18:43 2012
> Date: Tue, 22 May 2012 13:13:35 -0700
> From: "Thomas D. Dean" <tomdean at speakeasy.org>
> To: freebsd-questions at freebsd.org
> Subject: Using inb() and outb()
> I have nanoBSD running a hardware control application.
> To do this, I need inb() and outb() functions.
> I an do this as root. However, it is better if none of the control
> system is run as root.
> How do I allow these functions to one specific user?
To do that, you would have to re-build a significant portion of the
security controls of the O/S. Good luck.
'regular' users are simply -not- allowed to acces hardware I/O ports
directly. Only the 'superuser' can do that. Thus, to use inb()/outb()
the application must be running with EUID 0. No other options.
If you don't want the application to run as root, The only other option
is to write an actual 'device driver' -- which would execute as part of
the kernel -- that provides the required functionality to the app, and
does the actual hardware port IN/OUT operations iself, inside the driver.
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