Re: Bug/misfeature of "securityfs"

[James Morris <jmorris@namei.org>]

On Mon, 26 May 2008, Markku Savela wrote:

> 
> I write a module which creates a securityfs on init
> 
>   foobar =  securityfs_create_dir("foobar", NULL)
> and on exit it does
>   security_fs_remove(foobar);
> 
> When I do "insmod" and "rmmod", I see
> 
>   /sys/kernel/security/foobar/
> 
> appear and go away.
> 
> Now, if have a shell and do "cd /sys/kernel/security/foobar", the
> "rmmod" does not remove the directory. The directory disappears when I
> exit the shell from it via "cd ..". This is fine, and as it should be,
> but....
> 
> IF, while having the shell in the directory, I try to "insmod" again,
> the insmod fails with "-1 File exists". Again, understandable, BUT
> when after this I exit the shell from the directory, IT DOES NOT GO
> AWAY. It's permanetly existing, and module install fails always with
> "File Exists".
> 
> Is this a bug, or am doing something wrong?
> 
> The kernel is Ubuntu Hardy heron
>     2.6.24-16-generic #1 SMP Thu Apr 10 13:23:42 UTC 2008 i686

Sounds like a bug.


-- 
James Morris
<jmorris@namei.org>