Is there a kernel patch to stop single user mode?

[John Hebert <johnhebert () it-group com>]

Is there a way to stop someone with physical access to the box from booting
into single user mode and changing the root password? I'm not interested in
solutions that require setting a boot or poweron password in the BIOS. I'd
like something that could be done in the Linux kernel, so as to apply to
multiple platforms.

Thanks,
John Hebert

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