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From: Chris Brannon <chris@the-brannons.com>
To: "Speakup is a screen review system for Linux." <speakup@linux-speakup.org>
Subject: Re: OT: kernel oops
References: <0d30e6e5-261e-47e0-b5da-2ce5fe6bad24@default>
Date: Thu, 18 Jul 2013 09:04:41 -0700
In-Reply-To: <0d30e6e5-261e-47e0-b5da-2ce5fe6bad24@default> (Don Raikes's
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Don Raikes <don.raikes@oracle.com> writes:

> The section of code that is having problems looks like this:
*SNIP*
> if (copy_from_user(&tbuf, buf, count))

This line is your problem.  You are passing a
pointer-to-pointer-to-character (char **) as the first argument to
copy_from_user, but you should be passing char * instead.  So ditch the
ampersand, and all will be right with the world!
I could give you a thorough explanation of why this is failing, if you
like, but to make a long story short, this line of code is smashing the
stack!

I'm always happy to help.
-- Chris