linux-kernel - Re: [PATCH v0 1/2] IMA: Defined queue functions

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Date:   Mon, 02 Dec 2019 14:11:31 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        linux-integrity@...r.kernel.org
Cc:     eric.snowberg@...cle.com, dhowells@...hat.com,
        matthewgarrett@...gle.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org, Janne Karhunen <janne.karhunen@...il.com>
Subject: Re: [PATCH v0 1/2] IMA: Defined queue functions

On Mon, 2019-12-02 at 10:39 -0800, Lakshmi Ramasubramanian wrote:
> On 12/2/19 10:00 AM, Mimi Zohar wrote:
> 
> > 
> > ima_update_policy() is called from multiple places.  Initially, it is
> > called before a custom policy has been loaded.  The call to
> > ima_process_queued_keys_for_measurement() needs to be moved to within
> > the test, otherwise it runs the risk of dropping "key" measurements.
> 
> static const struct file_operations ima_measure_policy_ops = {
> 	.release = ima_release_policy,
> };
> 
> ima_update_policy() is called from ima_release_policy() function.
> 
> On my test machine I have the IMA policy in /etc/ima/ima-policy file. 
> When IMA policy is setup from this file, I see ima_release_policy() 
> called (which in turn calls ima_update_policy()).
> 
> How can I have ima_update_policy() called before a custom policy is loaded?

Oops, you're right.  My concern was ima_init_policy(), but it calls
ima_update_policy_flag() directly.

Mimi