Re: [Full-Disclosure] Idea

[Valdis.Kletnieks@vt.edu]

On Thu, 21 Aug 2003 11:12:06 PDT, D B <geggam692000@yahoo.com>  said:

> install the services .... get them configured
> ...remove all booting hardware except the drive ....
> then change the roots shell to /bin/false and and
> remove all working shells from the OS

Hmm.. Gonna be fun the next reboot, if *anything* in /etc/rc* is still a shell
script.  In fact, I just checked - Solaris, AIX, IRIX, and RedHat Linux will
*all* fail to get even as far as single-user mode, because in /etc/inittab we
have:

Solaris:	fs::sysinit:/sbin/rcS sysinit
AIX:	brc::sysinit:/sbin/rc.boot 3 >/dev/console 2>&1 # Phase 3 of system boot
IRIX:	mt::sysinit:/etc/brc </dev/console >/dev/console 2>&1
RedHat:	si::sysinit:/etc/rc.d/rc.sysinit

/sbin/rcS, /sbin/rc.boot, /etc/brc, and /etc/rc.d/rc.sysinit are all shell scripts.

Tru64 *will* make it as far single-user mode, but won't make it to runlevel 2 or 3:

Tru64:	s2:23:wait:/sbin/rc2 < /dev/console > /dev/console 2>&1

And of course, single-user mode won't be very useful without a shell for root.

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