Re: Breakage from patch: Only root should be able to set the N_MOUSE line discipline.

[Vojtech Pavlik]

On Tue, Mar 01, 2005 at 08:17:47AM -0800, Linus Torvalds wrote:

> On Tue, 1 Mar 2005, Vojtech Pavlik wrote:
> >  
> > A nonprivileged user could inject mouse movement and/or keystrokes
> > (using the sunkbd driver) into the input subsystem, taking over the
> > console/X, where another user is logged in.
> > 
> > Simply using a slightly modified inputattach on a PTY will do the trick.
> 
> Might an alternative be to just make writes to N_MOUSE require privileges?
> 
> Ie "reading is ok, and changing to N_MOUSE is ok, but tryign to write a 
> mouse packet is not"? The check should be easy enough to add to the 
> ldisc.write thing?
 
No, since you wouldn't write anything to the device, the writes would
happen on the other end of the pty.

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR
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