linux-kernel - Re: [PATCH 2/2] keys, trusted: seal with a policy

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Message-ID: <alpine.LRH.2.20.1512080934050.6296@namei.org>
Date:	Tue, 8 Dec 2015 09:35:05 +1100 (AEDT)
From:	James Morris <jmorris@...ei.org>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
cc:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	David Howells <dhowells@...hat.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Jonathan Corbet <corbet@....net>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"open list:KEYS-ENCRYPTED" <linux-security-module@...r.kernel.org>,
	"open list:KEYS-ENCRYPTED" <keyrings@...r.kernel.org>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"moderated list:TPM DEVICE DRIVER" 
	<tpmdd-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 2/2] keys, trusted: seal with a policy

On Mon, 7 Dec 2015, Jarkko Sakkinen wrote:

> On Fri, Nov 20, 2015 at 01:34:35PM +1100, James Morris wrote:
> > On Wed, 18 Nov 2015, Jarkko Sakkinen wrote:
> > 
> > > On Wed, Nov 18, 2015 at 11:21:01AM +1100, James Morris wrote:
> > > > On Tue, 17 Nov 2015, Jarkko Sakkinen wrote:
> > > > 
> > > > >  			}
> > > > >  			break;
> > > > > +		case Opt_policydigest:
> > > > > +			if (!tpm2 ||
> > > > > +			    strlen(args[0].from) != (2 * opt->digest_len))
> > > > > +				return -EINVAL;
> > > > > +			kfree(opt->policydigest);
> > > > > +			opt->policydigest = kzalloc(opt->digest_len,
> > > > > +						    GFP_KERNEL);
> > > > 
> > > > Is it correct to kfree opt->policydigest here before allocating it?
> > > 
> > > I think so. The same option might be encountered multiple times.
> > 
> > This would surely signify an error?
> 
> I'm following the semantics of other options. That's why I implemented
> it that way for example:
> 
> keyctl add trusted kmk "new 32 keyhandle=0x80000000 keyhandle=0x80000000"
> 
> is perfectly OK. I just thought that it'd be more odd if this option
> behaved in a different way...

It seems broken to me -- if you're messing up keyctl commands you might 
want to know about it, but we should remain consistent.


-- 
James Morris
<jmorris@...ei.org>

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