Re: [PATCH] Add audit uid to netlink credentials

[Patrick McHardy <kaber@xxxxxxxxx>]

Stephen Smalley wrote:

> On Tue, 2005-02-08 at 01:04, Patrick McHardy wrote:
>  
>
> > Reception of netlink messages in the kernel happens in the context
> > of the sending process, so you can simply call
> > audit_get_loginuid(current->audit_context) in audit_receive_msg().
> >    
> Then why does netlink_sendmsg() need to save the effective capability
> set of the sender in the control buffer (via security_netlink_send) for
> later checking by other receive functions in the kernel (via
> security_netlink_recv)?
It looks like it doesn't need to, I guess it was copied from 
netlink_sendmsg.
netlink transmission to userspace is asynchronous, some values need to be
saved, but userspace->kernel transmission is synchronous.

> What prevents audit_receive() or other similar
> receive functions in the kernel from processing messages sent by
> multiple senders?
Multiple messages from multiple senders are handled by multiple calls to
the input function. Check netlink_kernel_create() and netlink_data_ready().

Regards
Patrick