linux-kernel - Re: [PATCH 3/5] PKCS#7: Allow detached data to be supplied for signature checking purposes

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Message-ID: <1416841165.25352.42.camel@dhcp-9-2-203-236.watson.ibm.com>
Date:	Mon, 24 Nov 2014 09:59:25 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	mmarek@...e.cz, d.kasatkin@...sung.com, rusty@...tcorp.com.au,
	vgoyal@...hat.com, keyrings@...ux-nfs.org,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] PKCS#7: Allow detached data to be supplied for
 signature checking purposes

On Mon, 2014-11-24 at 14:41 +0000, David Howells wrote: 
> Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> 
> > > > Ok, PCKS#7 supports detached data.  I assume this is not needed for
> > > > kernel modules.  What is the motivation for adding this support to the
> > > > kernel?
> > > 
> > > See patch #5.  I should probably note that in the commit message.
> > 
> > This patch set does not change the syscall.  The signature is still
> > appended to the kernel module.
> 
> Ummm, yes, so?
> 
> > In fact, the call from kernel/module_signing.c: mod_verify_pkcs7() calls
> > pkcs7_supply_detached_data() with a pointer to the module and the module
> > length to set the data field. pkcs7_supply_detached_data() would not be
> > defined or exported, unless it was going to be called elsewhere.  How else
> > are you planning on using pkcs7_supply_detached_data()?
> 
> Is your point that I exported it unnecessarily?  That I have now fixed.

No, it was more a comment on the function name
pkcs7_supply_detached_data() being a bit weird, as the signature is
appended to the data.

Mimi

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