netdev - Re: [RFC v3 01/10] lsm: add security_socket

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Message-ID: <87oc3glz7s.fsf@synack.fr>
Date:	Fri, 06 May 2011 15:45:27 +0200
From:	Samir Bellabes <sam@...ack.fr>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	linux-security-module@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC v3 01/10] lsm: add security_socket_closed()

Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> writes:

> Samir Bellabes wrote:
>> Allow a module to update security informations when a socket is closed.
> Is security_inode_free() too late for doing it?
>
> static void ccs_inode_free_security(struct inode *inode)
> {
>         if (inode->i_sb && inode->i_sb->s_magic == SOCKFS_MAGIC)
>                 ccs_update_socket_tag(inode, 0);
> }

this point won't be possible.
security_inode_free() is occuring too late :

static int sock_close(struct inode *inode, struct file *filp)
{
        security_socket_close(SOCKET_I(inode)); 
           ... ->  acces sock->sk infos in this hook

        sock_release(SOCKET_I(inode));
        {
                sock->ops->release(sock);
                {
                        int inet_release(struct socket *sock)
                        {
                                struct sock *sk = sock->sk;

                                if (sk) {
                                sock_rps_reset_flow(sk);
                                sock->sk = NULL;
                                sk->sk_prot->close(sk, timeout);
                                 --> here sk infos are now removed
                        }
                }
                if (!sock->file) {
                   iput(SOCK_INODE(sock));
                --> here we are removing the inode, so
                    security_inode_free is called now, but too late.
                }
        }
}

        return 0;
}
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