linux-kernel - Re: [PATCH 6/8] evm: enable key retention service automatically

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Date:	Tue, 04 Mar 2014 14:25:00 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
Cc:	Dmitry Kasatkin <d.kasatkin@...sung.com>,
	linux-security-module@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	casey.schaufler@...el.com
Subject: Re: [PATCH 6/8] evm: enable key retention service automatically

On Tue, 2014-03-04 at 16:10 +0200, Dmitry Kasatkin wrote: 
> On Tue, Mar 4, 2014 at 4:02 AM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> > On Fri, 2014-02-28 at 16:59 +0200, Dmitry Kasatkin wrote:
> >> If keys are not enabled, EVM is not visible in the configuration menu.
> >> It may be difficult to figure out what to do unless  you really know.
> >>
> >> Other subsystems as NFS, CIFS select keys automatically.
> >> This patch does the same.
> >>
> >> Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
> >> ---
> >>  security/integrity/evm/Kconfig | 5 +++--
> >>  1 file changed, 3 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/security/integrity/evm/Kconfig b/security/integrity/evm/Kconfig
> >> index 5aa9103..d35b491 100644
> >> --- a/security/integrity/evm/Kconfig
> >> +++ b/security/integrity/evm/Kconfig
> >> @@ -1,9 +1,10 @@
> >>  config EVM
> >>       boolean "EVM support"
> >> -     depends on SECURITY && KEYS && (TRUSTED_KEYS=y || TRUSTED_KEYS=n)
> >
> > Including KEYS is fine, but the trusted-keys dependency is still
> > required.  If trusted-keys is enabled, then the TPM and trusted-keys
> > must be builtin.
> >
> 
> Hello.
> 
> EVM does not depend on trusted keys, but on encrypted keys.
> There is no need for "&& (TRUSTED_KEYS=y || TRUSTED_KEYS=n)"
> 
> Header file already provides all necessary compile time dependencies...
> 
> -------------------------------------------------------------------------------------------------
> #if defined(CONFIG_TRUSTED_KEYS) || \
>   (defined(CONFIG_TRUSTED_KEYS_MODULE) && defined(CONFIG_ENCRYPTED_KEYS_MODULE))
> extern struct key *request_trusted_key(const char *trusted_desc,
>       u8 **master_key, size_t *master_keylen);
> #else
> static inline struct key *request_trusted_key(const char *trusted_desc,
>      u8 **master_key,
>      size_t *master_keylen)
> {
> return ERR_PTR(-EOPNOTSUPP);
> }
> #endif
> -------------------------------------------------------------------------------------------------

Either in the patch description or the changelog, please note the reason
for removing the builtin TRUSTED_KEY dependency.  

thanks,

Mimi

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