Re: [Coverity] Untrusted user data in kernel

From: Horst von Brand
Date: Sat Dec 18 2004 - 09:29:08 EST

linux-os <linux-os@xxxxxxxxxxxxxxxxxx> said:
> On Fri, 17 Dec 2004, Bill Davidsen wrote:


> > Are you saying that processes with capability don't make mistakes? This
> > isn't a bug related to untrusted users doing privileged operations,
> > it's a case of using unchecked user data.

> But isn't there always the possibility of "unchecked user data"?

Yes. But it should be kept to a minimum.

> I can, as root, do `cp /dev/zero /dev/mem` and have the most
> spectacular crask you've evet seen. I can even make my file-
> systems unrecoverable.

Right. And you can get rid of /dev/mem if you don't want to screw yourself
this way (which is well-known). The problem at hand is _not_ in this same
Dr. Horst H. von Brand User #22616
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