Re: PTRACE_GET_THREAD_AREA

[Daniel Jacobowitz]

On Fri, Dec 20, 2002 at 10:24:31AM +0000, Christoph Hellwig wrote:
> On Fri, Dec 20, 2002 at 12:32:41AM -0800, Roland McGrath wrote:
> > This patch vs 2.5.51 (should apply fine to 2.5.52) adds two new ptrace
> > requests for i386, PTRACE_GET_THREAD_AREA and PTRACE_SET_THREAD_AREA.
> > These let another process using ptrace do the equivalent of performing
> > get_thread_area and set_thread_area system calls for another thread.
> 
> I don't think ptrace is the right interface for this.  Just changed
> the get_thread_area/set_thread_area to take a new first pid_t argument.
> 
> Of course you might have to check privilegues if the first argument is
> non-null (i.e. not yourself).

I have to disagree.  These are things which you should never do to
another process unless you're ptracing them; get_thread_area with a PID
is not generally useful.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer