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From: Christos Zoulas (christoszoulas.com)
Date: Tue Jul 10 2001 - 16:53:52 CDT

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    In article <1ewcs1w.1a209xy1pz2xpiM[10.0.12.137]>,
    Emmanuel Dreyfus <manunetbsd.org> wrote:
    >> | But it is a pain to be unable to use sshd with a read-only filesystem.
    >> But having dev readonly does not really work, does it? What happens
    >> when you try to write to /dev/null?
    >
    >It works. Having the fs read-only does not mean you cannot write to
    >devices:
    >
    >rootviolette[/root]#mount -o ro /dev/sd0a /
    >rootviolette[/root]#dd if=/dev/zero of=/dev/null count=100
    >100+0 records in
    >100+0 records out
    >51200 bytes transferred in 1 secs (51200 bytes/sec)
    >
    >What you can't do with /dev/null is set the immutable flag on it. That
    >way you won't be able to write to it.

    Interesting... Writing to writable files on a readonly filesystem is
    dissallowed. What happens to the mtime of the device?

    christos