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Top Forums UNIX for Dummies Questions & Answers How to create a file even root user also cant delete? Post 302891706 by Corona688 on Friday 7th of March 2014 11:16:29 AM
Old 03-07-2014
Quote:
Originally Posted by palani13dec
Is there any way to create a file in linux that root user also can't delete?
You cannot prevent root from being root.

Some filesystems like ext3 have extended options you can set for a file to make it undeletable even by root. Root can also turn this bit back off.

You cannot prevent root from being root.

If your security plan, depends on preventing root from being root, it's fatally flawed.
 

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pmvarrun(8)							     pam_mount							       pmvarrun(8)

Name
       pmvarrun - updates /var/run/pam_mount/user

Syntax
       pmvarrun -u user [options]

Description
       A  separate  program is needed so that /var/run/pam_mount/user may be created with a pam_mount-specific security context (otherwise SELinux
       policy will conflict with gdm, which also creates file in /var/run).

       pmvarrun is flexible and can run in a number of different security setups:

   root-root
       When pmvarrun is invoked as root, /var/run/pam_mount's permission settings can be as strict as needed; usually (0755,root,root) is  a  good
       pick  as  it  gives  users the debug control over their refcount. Refcount files are given their respective owners (chowned to the user who
       logs in).

   user-user
       When invoked as the user who logs in, /var/run/pam_mount needs appropriate permissions to create a file, which means the write bit must	be
       set. It is also highly suggested to set the sticky bit in this case, so other users do not tamper with your refcount.

   root-user
       Some  programs or login helpers incorrectly call the PAM stack in a way that the login phase is done as root and the logout phase as a nor-
       mal user.  Nevertheless, pmvarrun supports this, and the same permissions as in root-root can be used. While the user may not  be  able	to
       unlink his file from /var/run/pam_mount, it will be truncated to indicate the same state.

Options
       --help, -h
	      Display help.

       --user user, -u user
	      User to handle, must be a valid username.

       --operation number, -o number
	      Increase volume count by number.

       -d     Turn on debugging.

Files
       /var/run/pam_mount/user

Author
       This  manpage  was originally written by Bastian Kleineidam <calvin@debian.org> for the Debian distribution of libpam-mount but may be used
       by others.

       See /usr/share/doc/packages/pam_mount/AUTHORS for the list of original authors of pam_mount.

pam_mount							    2008-10-08							       pmvarrun(8)
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