can't see non-root writes to /dev/console

Edwin Groothuis edwin at
Mon Oct 13 14:22:59 PDT 2008

On Sun, Oct 12, 2008 at 10:23:53PM -0700, Jeremy Chadwick wrote:
> > The ioctl call fails (EPERM) because only superuser can use TIOCCONS,
> > regardless the ownership of the device. Using xterm with the "-C"
> > argument works because xterm is installed with the setuid flag bit on.
> > So the solution is "chmod +us  xconsole".
> Can someone security audit this program before blindly setuid-root'ing
> it?

Isn't xconsole not just the same values as /var/log/messages ?

So information-leaking-wise it isn't a huge deal. Only the program
itself is now the unknown.

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