Re: [PATCH audit-next 2/2] Audit: make audit netlink socket net namespace unaware

["Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>]

Quoting Gao feng (gaofeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org):
> Add a compare function which always return true for
> audit netlink socket, this will cause audit netlink
> sockets netns unaware, and no matter which netns the
> user space audit netlink sockets belong to, they all
> can find out and communicate with audit_sock.
> 
> This gets rid of the necessary to create per-netns
> audit kernel side socket(audit_sock), it's pain to
> depend on and get reference of netns for auditns.
> 
> Signed-off-by: Gao feng <gaofeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>

So whereas before you could prevent a task from spamming
audit by putting it into a private netns, now you have to
do it using a user namespace (to prevent capable(CAP_AUDIT_WRITE))
right?

I don't know that anyone is depending on that, in any case, but
it's a change.

Is this building up to something?

> ---
>  kernel/audit.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/kernel/audit.c b/kernel/audit.c
> index b62153a..2ac6212 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -1064,12 +1064,18 @@ static void audit_receive(struct sk_buff  *skb)
>  	mutex_unlock(&audit_cmd_mutex);
>  }
>  
> +static bool audit_compare(struct net *net, struct sock *sk)
> +{
> +	return true;
> +}
> +
>  /* Initialize audit support at boot time. */
>  static int __init audit_init(void)
>  {
>  	int i;
>  	struct netlink_kernel_cfg cfg = {
>  		.input	= audit_receive,
> +		.compare = audit_compare,
>  	};
>  
>  	if (audit_initialized == AUDIT_DISABLED)
> -- 
> 1.8.4.2
> 
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