linux-kernel - Re: module loading with CAP_NET

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Date:	Fri, 25 Feb 2011 15:30:23 +0300
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kees Cook <kees.cook@...onical.com>,
	Eugene Teo <eugene@...hat.com>,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: module loading with CAP_NET_ADMIN

On Thu, Feb 24, 2011 at 16:34 +0000, Ben Hutchings wrote:
> On Thu, 2011-02-24 at 18:12 +0300, Vasiliy Kulikov wrote:
> > My proposal is changing request_module("%s", name) to something like
> > request_module("netdev-%s", name) inside of dev_load() and adding
> > aliases to related drivers.
> 
> AFAIK these interface-name aliases are usually defined by distribution
> configuration files rather than within the modules themselves.  And that
> behaviour is pretty much obsolete now that we have hotplug and udev.
> 
> > This would allow to load only netdev
> > modules via these ioctls.  I'm not sure what modules should be patches -
> > at least real physical netdevices have names different from drivers'
> > names, so they don't need patching.  I suppose the list is not big.
> 
> The only modules I can see that declare aliases like this are:
> 
> net/ipv4/ip_gre.c:MODULE_ALIAS("gre0");
> net/ipv4/ipip.c:MODULE_ALIAS("tunl0");
> net/ipv6/sit.c:MODULE_ALIAS("sit0");

Thank you!  These are not handled via udev or anything, it is usefull to
load it via "ifconfig sit0 up", so they do require patching.

I didn't find any modules requiring autoloading except these three.
Good candidate should be "isatap0" as it is seen in ip help, but there
is no such alias.

$ ip tunnel add help 2>&1 | grep mode
          [ mode { ipip | gre | sit | isatap } ] [ remote ADDR ] [ local ADDR ]


I'll send the patch for request_module() and three drivers.


Thanks,

-- 
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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