Re: linux-next: add utrace tree

Steven Rostedt
2010-01-27T18:53:25Z

On Wed, 2010-01-27 at 09:42 -0800, H. Peter Anvin wrote:
> On 01/27/2010 05:59 AM, Steven Rostedt wrote:

> > I think the issue was that ring 0 was never meant to do that, where as,
> > ring 3 does it all the time. Doesn't the dynamic library modify its
> > text?
> >
>
> No, it has nothing to do with ring. It has to do with modifying code
> that another CPU could be executing at the same time, and with modifying
> code on the same processor through another virtual alias (they are
> different issues.) The same issues apply regardless of the CPL of the
> processor.

Thanks for clarifying.

-- Steve