Re: SUID root

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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.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer
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