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Operating Systems Linux Ubuntu Weird rm behaviour
# 1  
Old 12-01-2011
Weird rm behaviour
I am little bit confused by the behaviour of rm in Ubuntu.

It seems that as a regular user I can delete files owned by another user even when the permissions are set to 644.

Here is an example:

Code:
cjohnson@carbon:~/test$ sudo touch testfile
cjohnson@carbon:~/test$ ls -al
total 8
drwxr-xr-x  2 cjohnson cjohnson 4096 2011-12-01 11:21 .
drwxr-xr-x 64 cjohnson cjohnson 4096 2011-12-01 11:21 ..
-rw-r--r--  1 root     root        0 2011-12-01 11:21 testfile
cjohnson@carbon:~/test$ rm testfile
rm: remove write-protected regular empty file `testfile'? y
cjohnson@carbon:~/test$ ls -al
total 8
drwxr-xr-x  2 cjohnson cjohnson 4096 2011-12-01 11:21 .
drwxr-xr-x 64 cjohnson cjohnson 4096 2011-12-01 11:21 ..
cjohnson@carbon:~/test$

Anybody have an explanation?

Should have added this:

Code:
uname -a
Linux carbon 2.6.32-24-server #43-Ubuntu SMP Thu Sep 16 16:05:42 UTC 2010 x86_64 GNU/Linux

Last edited by ccj4467; 12-01-2011 at 12:31 PM.. Reason: addedd OS info
# 2  
Old 12-01-2011
unlink (and create) permission is determined by the directory, not the file.
This User Gave Thanks to CarloM For This Post:
ccj4467
# 3  
Old 12-01-2011
Yeah, just figured that one out. I guess I learned that many years ago and just forgot.

Thanks
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