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From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
	dhowells@redhat.com, matthewgarrett@google.com,
	sashal@kernel.org, jamorris@linux.microsoft.com,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 08/10] IMA: Defined functions to queue and dequeue keys for measurement
Date: Wed, 6 Nov 2019 18:20:11 -0800
Message-ID: <b9f293d8-6e58-4d56-1917-5819f0b8931a@linux.microsoft.com> (raw)
In-Reply-To: <1573080281.5028.314.camel@linux.ibm.com>

On 11/6/19 2:44 PM, Mimi Zohar wrote:

Hi Mimi,

>> +
>> +	if (ima_initialized) {
> 
> ima_initialized is being set in ima_init(), before a custom policy is
> loaded.  I would think that is too early.  ima_update_policy() is
> called after loading a custom policy.  Please see how to detect when a
> custom policy is loaded.

ima_init_policy() is called before ima_initialized flag is set.

As far as I understand ima_init_policy() loads custom policies as well. 
So custom policies (such as arch specific policies, secure boot 
policies, etc.) are loaded before the queued keys are processed.

But if CONFIG_IMA_WRITE_POLICY is enabled, the policy can be updated 
anytime. This scenario is not handled in my implementation.

Please correct me if my understanding is wrong.

thanks,
  -lakshmi




  parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-06 19:01 [PATCH v4 0/10] KEYS: Measure keys when they are created or updated Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 01/10] IMA: Defined an IMA hook to measure keys on key create or update Lakshmi Ramasubramanian
2019-11-06 22:43   ` Mimi Zohar
2019-11-07  0:21     ` Lakshmi Ramasubramanian
2019-11-07  3:40       ` Mimi Zohar
2019-11-07 18:42         ` Lakshmi Ramasubramanian
2019-11-07 20:53           ` Mimi Zohar
2019-11-07 21:12             ` Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 02/10] IMA: Added KEYRING_CHECK func in IMA policy to measure keys Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 03/10] IMA: Added keyrings= option in IMA policy to only measure keys added to the specified keyrings Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 04/10] IMA: Read keyrings= option from the IMA policy into ima_rule_entry Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 05/10] IMA: Updated IMA policy functions to return keyrings option read from the policy Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 06/10] IMA: Measure key if the IMA policy allows measurement for the keyring to which the key is linked to Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 07/10] IMA: Added a boolean flag to track IMA initialization status Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 08/10] IMA: Defined functions to queue and dequeue keys for measurement Lakshmi Ramasubramanian
2019-11-06 22:44   ` Mimi Zohar
2019-11-06 23:52     ` Lakshmi Ramasubramanian
2019-11-07  2:20     ` Lakshmi Ramasubramanian [this message]
2019-11-06 19:01 ` [PATCH v4 09/10] IMA: Call queue and dequeue functions to measure keys Lakshmi Ramasubramanian
2019-11-06 19:01 ` [PATCH v4 10/10] KEYS: Call the IMA hook to measure key when a new key is created or an existing key is updated Lakshmi Ramasubramanian

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