linux-kernel - Re: [PATCH v2 1/4] KEYS: Defined an ima hook for measuring keys on key create or update

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Date:   Sun, 27 Oct 2019 10:47:24 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        dhowells@...hat.com, casey@...aufler-ca.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com,
        linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org
Subject: Re: [PATCH v2 1/4] KEYS: Defined an ima hook for measuring keys on
 key create or update

On Fri, 2019-10-25 at 15:28 -0700, Lakshmi Ramasubramanian wrote:
> On 10/25/2019 12:40 PM, Mimi Zohar wrote:
> 
> >> +void ima_post_key_create_or_update(struct key *keyring, struct key *key,
> >> +				   unsigned long flags, bool create)
> >> +{
> >> +	const struct public_key *pk;
> >> +
> >> +	if (key->type != &key_type_asymmetric)
> >> +		return;
> >> +
> >> +	if (!ima_initialized)
> >> +		return;
> > 
> > There's no reason to define a new variable to determine if IMA is
> > initialized.  Use ima_policy_flag.  
> 
> Please correct me if I am wrong -
> 
> ima_policy_flag will be set to 0 if IMA is not yet initialized
> OR
> IMA is initialized, but ima_policy_flag could be still set to 0 (say, 
> due to the configured policy).
> 
> In the latter case the measurement request should be a NOP immediately.

I'm not sure.  The builtin keys most likely will be loaded prior to a
custom IMA policy containing "keyring" rules are defined.

Mimi