Re: [PATCH 2/2] audit: fix incorrect set of audit_sock

[Richard Guy Briggs <rgb@redhat.com>]

On 13/12/17, Gao feng wrote:
> NETLINK_CB(skb).sk is the socket of user space process,
> netlink_unicast in kauditd_send_skb wants the kernel
> side socket. Since the sk_state of audit netlink socket
> is not NETLINK_CONNECTED, so the netlink_getsockbyportid
> doesn't return -ECONNREFUSED.
> 
> And the socket of userspace process can be released anytime,
> so the audit_sock may point to invalid socket.
> 
> this patch sets the audit_sock to the kernel side audit
> netlink socket.

Thank you.

> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
> ---
>  kernel/audit.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 041b951..ff1d1d7 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -822,7 +822,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
>  				audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
>  			audit_pid = new_pid;
>  			audit_nlk_portid = NETLINK_CB(skb).portid;
> -			audit_sock = NETLINK_CB(skb).sk;
> +			audit_sock = skb->sk;
>  		}
>  		if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
>  			err = audit_set_rate_limit(s.rate_limit);
> -- 
> 1.8.3.1

- RGB

--
Richard Guy Briggs <rbriggs@redhat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
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