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    SubjectRe: SUID root
    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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