Re: SUID root

["Richard B. Johnson" <root@chaos.analogic.com>]

On Wed, 16 Jul 2003, Daniel Jacobowitz wrote:

> On Wed, Jul 16, 2003 at 10:19:14AM -0400, Richard B. Johnson wrote:
> >
> > It appears as though SUID root programs don't work on
> > linux 2.4.20, 2.4.21, or 2.4.22-pre6, or at least what
> > used to work no longer does.
> >
> > One program tries to execute iopl(3). In the event that
> > it fails, it tries to set UID/GID to root after saving
> > the previous, then tries again.
> >
> > The program exists in /usr/bin, properly owned by root. It
> > is set SUID, 4755, and otherwise works. Anybody have any
> > clues? Do SUID programs have to be re-written to use some
> > other mechanism? I need to have a user-mode program get
> > access to an otherwise unused printer port. It's a shame
> > to write a module just for this.
>
> You're stracing it.  Stracing prevents setuid from occurring; it used
> to just prevent the exec.
>

Okay. Thanks, you are right. It is actually working I guess.


Cheers,
Dick Johnson
Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips).
            Note 96.3% of all statistics are fiction.