linux-kernel - Re: [PATCH v6 2/5] ima: define a new template field named 'd-ngv2' and templates

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Date:   Mon, 21 Mar 2022 16:46:57 -0400
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, linux-integrity@...r.kernel.org
Cc:     Eric Biggers <ebiggers@...nel.org>, linux-fscrypt@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/5] ima: define a new template field named 'd-ngv2'
 and templates



On 3/21/22 15:48, Mimi Zohar wrote:
> On Mon, 2022-03-21 at 08:53 -0400, Stefan Berger wrote:

>>> +
>>> +/*
>>> + * This function writes the digest of an event (without size limit),
>>> + * prefixed with both the hash type and algorithm.
>>> + */
>>> +int ima_eventdigest_ngv2_init(struct ima_event_data *event_data,
>>> +			      struct ima_field_data *field_data)
>>> +{
>>> +	u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
>>> +	u32 cur_digestsize = 0;
>>> +	u8 digest_type = 0;
>>
>> What does '0' mean? I think this should definitely be an enum or at
>> least #define.
> 
> The first element of the array is "ima".  Should I define two macros
> similar to kernel_read_file_id and kernel_read_file_str for just two
> strings?

I would introduce an enum like enum hash_algo: 
https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/hash_info.h#L38

And an array like hash_algo_name: 
https://elixir.bootlin.com/linux/latest/source/crypto/hash_info.c#L12


> 
> thanks,
> 
> Mimi
>