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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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null(n) 																   null(n)

__________________________________________________________________________________________________________________________________________________

NAME
null - Create and manipulate null channels SYNOPSIS
package require Tcl package require memchan null _________________________________________________________________ DESCRIPTION
The command described here is only available in a not-yet released version of the package. Use the CVS to get the sources. null creates a null channel which absorbs everything written into it. Reading from it is not possible, or rather will always return zero bytes. These channels are essentially Tcl-specific variants of the null device for unixoid operating systems (/dev/null). Transfer- ing the generated channel between interpreters is possible but does not make much sense. OPTIONS
Memory channels created by null provide one additional option to set or query. -delay ?milliseconds? A null channel is always writable and readable. This means that all fileevent-handlers will fire continuously. To avoid starvation of other event sources the events raised by this channel type have a configurable delay. This option is set in milliseconds and defaults to 5. A null channel is always writable and never readable. This means that a writable fileevent-handler will fire continuously and a readable fileevent-handler never at all. The exception to the latter is only the destruction of the channel which will cause the delivery of an eof event to a readable handler. SEE ALSO
fifo, fifo2, memchan, random, zero KEYWORDS
channel, i/o, in-memory channel, null COPYRIGHT
Copyright (c) 1996-2003 Andreas Kupries <andreas_kupries@users.sourceforge.net> Memory channels 2.2 null(n)
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