linux-kernel - Re: [PATCH 1/4] module: add syscall to load module from fd

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Message-ID: <507F848F.50707@zytor.com>
Date:	Wed, 17 Oct 2012 21:24:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	mtk.manpages@...il.com, Kees Cook <keescook@...omium.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Arnd Bergmann <arnd@...db.de>,
	James Morris <james.l.morris@...cle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Eric Paris <eparis@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 1/4] module: add syscall to load module from fd

On 10/11/2012 03:16 PM, Rusty Russell wrote:
> "H. Peter Anvin" <hpa@...or.com> writes:
> 
>> On 10/10/2012 06:03 AM, Michael Kerrisk (man-pages) wrote:
>>> Good point. A "whole hog" openat()-style interface is worth thinking about too.
>>
>> *Although* you could argue that you can always simply open the module
>> file first, and that finit_module() is really what we should have had in
>> the first place.  Then you don't need the flags since those would come
>> from openat().
> 
> There's no fundamental reason that modules have to be in a file.  I'm
> thinking of compressed modules, or an initrd which simply includes all
> the modules it wants to load in one linear file.
> 
> Also, --force options manipulate the module before loading (as did the
> now-obsolete module rename option).
> 

So perhaps what we *should* have is something that points to the module
to a (buffer, length) in userspace, and the equivalent of the current
init_module() would be open() + mmap() + minit_module() + close()?

	-hpa



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