From: Don Raikes <don.raikes@oracle.com>
To: "Speakup is a screen review system for Linux."
<speakup@linux-speakup.org>
Subject: RE: OT: looking for resources
Date: Wed, 17 Jul 2013 22:24:05 -0700 (PDT) [thread overview]
Message-ID: <bd005e42-cdd6-4048-a226-885317fd5a8d@default> (raw)
In-Reply-To: <20130718041453.GA13547@jdc.jasonjgw.net>
Wow, this group is great!
I got my kmalloc to work, figured out I had the test for success backward :-(
Now that I have memory allocated, I am trying to copy a character array from userspace into kernel space with the command:
If (copy_from_user(&tbuf, buf, count))
Which according to my printk statements succeeds. However, I then get a kernel page fault and the whole thing comes crashing down.
Any suggestions on how to debug this?
The only thing I can see in the dump is that it looks like it is in kfree.
-----Original Message-----
From: Jason White [mailto:jason@jasonjgw.net]
Sent: Wednesday, July 17, 2013 9:15 PM
To: speakup@linux-speakup.org
Subject: Re: OT: looking for resources
Chris Brannon <chris@the-brannons.com> wrote:
> The Linux Device Drivers book is on Bookshare as well.
> If I remember correctly, Understanding the Linux Kernel explains
> kernel internals, rather than the procedures involved in kernel programming.
It has been used by the authors to teach an operating system course, if I remember rightly.
> In other words, Understanding the Linux Kernel deals with theory, and
> Linux Device Drivers deals with practice.
> That's how it looked to me, at least.
> I suspect that the two texts complement each other very well.
There is also, from the same source, Christian Benvenuti, Understanding Linux Network Internals (O'Reilly).
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Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
Don Raikes
` Chris Brannon
` Don Raikes
` Jason White
` Don Raikes
` Chris Brannon
` Jason White
` Don Raikes [this message]
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