linux-kernel - Re: [PATCH v6 1/3] IMA: Add KEY

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Message-ID: <320826aa-f744-f2ae-8693-a6ce9461d886@linux.microsoft.com>
Date:   Wed, 13 Nov 2019 12:21:56 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, dhowells@...hat.com,
        matthewgarrett@...gle.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/3] IMA: Add KEY_CHECK func to measure keys

On 11/13/2019 12:14 PM, Mimi Zohar wrote:

>> @@ -655,6 +655,13 @@ void process_buffer_measurement(const void *buf, int size,
>>   	int action = 0;
>>   	u32 secid;
>>   
>> +	/*
>> +	 * If IMA is not yet initialized or IMA policy is empty
>> +	 * then there is no need to measure.
>> +	 */
>> +	if (!ima_policy_flag)
>> +		return;
>> +
> 
> This addition has nothing to do with defining a new IMA hook and
> should be a separate patch.  This can be posted independently of this
> patch set.
> 
> Mimi

I'll move this change to a different patch,
but it has to be either part of this patch set or the above change alone 
needs to be taken before this patch set for the following reason:

The IMA hook gets called early in the boot process (for example, when 
builtin_trusted_keys are added). If the above check is not there, 
ima_get_action() is called and causes kernel panic (since IMA is not yet 
initialized).

thanks,
  -lakshmi