olli at lurza.secnetix.de
Wed Nov 29 09:19:05 PST 2006
Stefan Lambrev wrote:
> Can someone explain to me why next can happened on freebsd:
> 1. add 2 users in same group - user test and test-ro in group test
> 2. as user test: cd /home/test ; mkdir test; chmod 775 test; echo
> "asdasd" > ~/test/del.me
What was your umask? I assume 022, i.e. the file was
created with mdoe 644.
> 3. su - test-ro ; cd /home/test; vim del.me - make changes; force save (:x!)
I suspect that vim -- upon force save -- deleted the
original file, which is perfectly possible because the
test-ro user had write permission to the directory.
Then vim created a new file with the same name, which
is again perfectly possible because of the writability
of the directory. The new file belongs to the test-ro
user, of course.
> ls -l
> total 2
> -rw-r--r-- 1 test-ro test 10 Nov 29 18:19 del.me (how is that possible ?)
> back "su - test" and try to edit this file - impossible!
.. That's to be expected.
> I do not know what the RFC says about it, but it is ultra weird for me
> that such ownership takeover is possible.
It is standard and perfectly correct behaviour.
There was no "ownership takeover". One file was deleted,
and a new file was created, all allowed by the given
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing
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