Secure Delete utilities for Linux EXT3

[Roger Oberholtzer]

On Thu, 15 Apr 2004 06:28:32 -0500
"David A. Bandel" <david at pananix.com> wrote:

> That's because you don't need it.  Folks that are concerned about
> deleting files they may need can replace the rm command with a function
> when they log in that does exactly what you are asking.  Functions
> follow aliases in order of execution (so make sure you don't have a
> full-pathed alias for rm) but are instantiated before a call to a system
> binary.  So google for a program called saferm, turn it into a function,
> and you'll have your Norton safedelete/unerase capability.

Not quite. Say I have a compiled program (mine or someone else's) that makes
and deletes files. And I do not want the files it creates to leave data on
the disk after they are deleted. As a compiled program, it probably does not
use 'rm'. It uses a system call. If I want ALL programs to have this
capability, changing a compiled program like rm into some other program will
not do it. You need intervention at the point it is done: the OS call to do
this. Your solution will work for shell scripts and programs that oddly call
programs to do system calls. In addition, how many programs can remove a
file from the system? How many you do not know about or did not guess? All
these would need to be replaced and maintained. The preload object
simplifies this with a single, coherent, simple (it really is) addition of
this capability. That everyone shares.




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