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Full Discussion: /dev/null file issue
Operating Systems AIX /dev/null file issue Post 302772456 by MichaelFelt on Monday 25th of February 2013 05:01:25 PM
Old 02-25-2013
I think a more AIX way of recreating /dev/null on AIX is:

Code:
# rm /dev/null
# cfgmgr

I would be curious to know how it became a character file (implies someone with write perms on /dev removed it, and the first person to write to /dev/null (would be the new owner) recreated it as a regular file. I would expect that there is a script being run by root that is deleting it, and writing it again. Since you show 0 bytes, it is also being truncated as well.

So, your second security issue is when is it being removed? If you cannot answer this, the issue will come back and haunt you.
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console.perms(5)					   System Administrator's Manual					  console.perms(5)

NAME
console.perms - permissions control file for users at the system console DESCRIPTION
/etc/security/console.perms determines the permissions that will be given to priviledged users of the console at login time, and the per- missions to which to revert when the users log out. It is read by the pam_console module. The format is: <class>=space-separated list of words login-regexp|<login-class> perm dev-glob|<dev-class> revert-mode revert-owner[.revert-group] The revert-mode, revert-owner, and revert-group fields are optional, and default to 0600, root, and root, respectively. The words in a class definition are evaluated as globs if they refer to files, but as regular expressions if they apply to a console defi- nition. Do not mix them. Any line can be broken and continued on the next line by using a character as the last character on the line. The login-class class and the login-regexp word are evaluated as regular expressions. The dev-class and the dev-glob word are evaluated as shell-style globs. If a name given corresponds to a directory, and if it is a mount point listed in /etc/fstab, the device node associated with the filesystem mounted at that point will be substituted in its place. Classes are denoted by being contained in < angle bracket > characters; a lack of < angle brackets > indicates that the string is to be taken literally as a login-regexp or a dev-glob, depending on its input position. SEE ALSO
pam_console(8) pam_console_apply(8) console.apps(5) AUTHOR
Michael K. Johnson <johnsonm@redhat.com> Red Hat Software 1999/2/3 console.perms(5)
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