From: Daniel Jacobowitz <dan@debian.org>
To: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: SUID root
Date: Wed, 16 Jul 2003 10:22:49 -0400 [thread overview]
Message-ID: <20030716142249.GA22473@nevyn.them.org> (raw)
In-Reply-To: <Pine.LNX.4.53.0307161017060.26254@chaos>
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
next prev parent reply other threads:[~2003-07-16 14:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-16 14:19 Richard B. Johnson
2003-07-16 14:22 ` Daniel Jacobowitz [this message]
2003-07-16 14:42 ` Richard B. Johnson
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