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Full Discussion: How to create a file even root user also cant delete?
Top Forums UNIX for Dummies Questions & Answers How to create a file even root user also cant delete? Post 302891874 by Perderabo on Saturday 8th of March 2014 08:07:58 PM
Old 03-08-2014
Back in the 80's I worked for a company that had source code licenses to System V Unix and HP-UX. Management, in their wisdom, had decreed that the software developers had access to root. I put the source code on a read-only partition. This protected it from programmers that sat all day in a root shell and always used "vi" rather than "view". They were clueless but not malicious.

My current employer works with some US government agencies and one of them examined a linux system prior to being connected to closed network. One of the changes they demanded was for me to set the immutable flag on grub.conf. So I did. And yes, root can turn off the flag, change the file, then turn the flag back on. I also thought that grub.conf was odd choice to be the only file needing extra protection.
 

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LEARN ABOUT X11R4

switch_root

SWITCH_ROOT(8)						       System Administration						    SWITCH_ROOT(8)

NAME

       switch_root - switch to another filesystem as the root of the mount tree

SYNOPSIS

       switch_root [-hV]

       switch_root newroot init [arg...]

DESCRIPTION

       switch_root moves already mounted /proc, /dev, /sys and /run to newroot and makes newroot the new root filesystem and starts init process.

       WARNING: switch_root removes recursively all files and directories on the current root filesystem.

OPTIONS

       -h, --help
	      Display help text and exit.

       -V, --version
	      Display version information and exit.

RETURN VALUE

       switch_root returns 0 on success and 1 on failure.

NOTES

       switch_root  will  fail	to  function if newroot is not the root of a mount. If you want to switch root into a directory that does not meet
       this requirement then you can first use a bind-mounting trick to turn any directory into a mount point:

	      mount --bind $DIR $DIR

SEE ALSO

       chroot(2), init(8), mkinitrd(8), mount(8)

AUTHORS

       Peter Jones <pjones@redhat.com>
       Jeremy Katz <katzj@redhat.com>
       Karel Zak <kzak@redhat.com>

AVAILABILITY

       The switch_root command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux							     June 2009							    SWITCH_ROOT(8)
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