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

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Message-ID: <CAKgNAki+KV=Nh8D3La50uXpWv7PA5T-oPYJwK-PkOv5vMg0AqA@mail.gmail.com>
Date:	Thu, 18 Oct 2012 10:05:17 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	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 Thu, Oct 18, 2012 at 6:24 AM, H. Peter Anvin <hpa@...or.com> wrote:
> 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()?

So, I don't get it. What are the args you propose for of minit_module()?


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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