 | | | why can I write to a file I don 't own?? | why can I write to a file I don 't own?? 2005-04-14 - By Bill Medland
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On April 14, 2005 02:56 pm, David.Knight@(protected) wrote:
> RedHat List,
> I was working on a script the other day and ran into
> an anomaly with the file permission's on files. I have checked
> this on several ES servers and all produce the same results.
Makes sense to me, as a weird behaviour of vi.
> Say a file has the following perms: 644 and it is owner and
> group are root:root. as long as a user has write permission's
> to the directory it is in they can write to it.
Not quite; they can delete it and then create a new one.
> not only that
> the UID:GID change to that user.
Not quite; the new one correctly has the user as owner, since the
user created it.
(Interesting; it gets the same inode)
>
I am running ext3 file
> systems with kernel 2.4.21-20.ELsmp. So my question is
>
> 1) why is this allowed?
Standard Unix file permissions
> 2) can I change this?
Don't override vi's decision when it tells you that you are
overriding a readonly file.
>
> # pwd
> /home/test_dir
> # rm test.fil
> # pwd
> /home/test_dir
> # ls -ld .
> drwxr-xr-x 2 user7 root 4096 Apr 14 16:56 .
> # id
> uid=0(root) gid=0(root)
> groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel
>) # echo "test from root" > test.fil
> # ls -l test.fil
> -rw-r--r-- 1 root root 15 Apr 14 16:57
> test.fil # su - user7
So I presume /home/test_dir is user7's home directory
> $vi test.fil
And presumably vi told you it was a readonly file.
> $ ls -l test.fil
> -rw-r--r-- 1 user7 user7 31 Apr 14 16:57 test.fil
> $ cat test.fil
> test from root
> test from uset7
>
> However it doesn't let you echo "test from user7" >
> ./test.fil. it responds correctly......
because that would truly be trying to modify the file rather than
replace it.
> Any thoughts on this would be great.
> -David Knight
--
Bill Medland
mailto:billmedland@(protected)
http://webhome.idirect.com/~kbmed
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