linux-kernel - Re: [PATCH 00/23] Crypto keys and module signing

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Date:	Mon, 04 Jun 2012 08:47:51 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	David Howells <dhowells@...hat.com>, kyle@...artin.ca,
	dmitry.kasatkin@...el.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org
Subject: Re: [PATCH 00/23] Crypto keys and module signing

On Mon, 2012-06-04 at 11:01 +0930, Rusty Russell wrote:
> On Fri, 25 May 2012 16:42:19 +0100, David Howells <dhowells@...hat.com> wrote:
> > 
> > Hi Rusty,
> > 
> > If you prefer to have userspace extract the module signature and pass it in
> > uargs, here's a tree that will do that:
> > 
> > 	http://git.kernel.org/?p=linux/kernel/git/dhowells/linux-modsign.git;a=shortlog;h=refs/heads/modsign-uarg
> 
> OK, there's merit in this approach: it certainly moves the argument
> about how to encode the signature out of my backyard :)
> 
> Should we just bite the bullet and create a new syscall:
> 
> SYSCALL_DEFINE5(init_module2, void __user *, umod,
> 		unsigned long, len, const char __user *, uargs,
>                 unsigned int, siglen, const char __user *, sig)
> 
> But I'm easily swayed if you prefer the current approach.
> 
> Thanks,
> Rusty.

If you're really considering creating a new syscall, then perhaps this
discussion should include passing the file descriptor instead of a
buffer and signature.  As I said https://lkml.org/lkml/2012/5/25/261, I
don't know the historical reasons for passing a buffer instead of the
file descriptor itself.  If the file descriptor was passed, it would
allow IMA-appraisal, which is in the process of being upstreamed, to
verify and enforce file data and metadata integrity like on the other
hooks open, execve, and mmap.

thanks,

Mimi

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