On 07:21 21 Feb 2003, Michael George <[EMAIL PROTECTED]> wrote:
| On Fri, Feb 21, 2003 at 01:01:08PM +1100, Cameron Simpson wrote:
| > It's only a security hole if you imagine that mtime is immutable, and
| > depend on it for something critical. I can't see how it's worse than
| > allowing users to _write_ to files they own - after all they could _erase_
| > them, or fill them with lies!
| > 
| > How do you think "tar" et al unpack stuff with the right timestamps?
| 
| I guess that's true...  I guess I have had the faulty assumption that if a
| file has been modified in any way, it will be stamped with that time by the
| FS.

This forward implication is correct.

| As such, there can be proof that a file had not been modified since a
| certain date.

This is not. Remember that implication is not equivalence.
-- 
Cameron Simpson, DoD#743        [EMAIL PROTECTED]    http://www.zip.com.au/~cs/

If ye can say 'tis a brrraugh brrrrrit moonlicht nicht tonicht ye're
alrrright I ken.
        An old Scotts drrrinkin song taught me by my Grandmother
                - Ed Campbell, [EMAIL PROTECTED] (maybe)



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