linux-kernel - Re: [PATCH v6 3/6] KEYS: make partial key id matching as a dedicated function

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Date:	Mon, 30 Jun 2014 15:20:48 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Dmitry Kasatkin <d.kasatkin@...sung.com>,
	keyrings <keyrings@...ux-nfs.org>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Josh Boyer <jwboyer@...hat.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
Subject: Re: [PATCH v6 3/6] KEYS: make partial key id matching as a
 dedicated function

On Mon, 2014-06-30 at 16:14 +0300, Dmitry Kasatkin wrote: 
> On 27/06/14 16:38, David Howells wrote:
> > Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> >
> >> +	if (strncmp(id, "id:", 3) == 0)
> 
> >> Use memcmp() here.
> 
> 'id' function parameter comes from "keys_ownerid" kernel parameter.
> User can supply anything shorter than "id:".
> Though comparing 3 bytes should not produce any memory access errors,
> memcmp can access beyond the length of the string.
> I think 'strcnmp' is more appropriate here...
> 
> 
> >> -	kid += kidlen - idlen;
> >> -	if (strcasecmp(id, kid) != 0)
> >> -		return 0;
> > This test is no longer applied in the "<subtype>:..." case.
> 
> I did not get fully what you comment here or ask to do..
> But yes, with this patch, it is no longer the case.

Other than this comment, all of the other comments have been addressed.
The updated patches are available from
linux-integrity/next-trusted-keys.

thanks,

Mimi

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