linux-kernel - Re: [PATCH 12/20] ima: provide buffer hash calculation function

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Message-id: <535A7690.30205@samsung.com>
Date:	Fri, 25 Apr 2014 17:52:00 +0300
From:	Dmitry Kasatkin <d.kasatkin@...sung.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, jmorris@...ei.org, roberto.sassu@...ito.it,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/20] ima: provide buffer hash calculation function

On 25/04/14 00:04, Mimi Zohar wrote:
> On Wed, 2014-04-23 at 16:30 +0300, Dmitry Kasatkin wrote: 
>> This patch provides convenient buffer hash calculation function.
>>
>> Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
> Where/how is it being used?  We normally don't upstream a new function
> without it being used.  Is the usage in another patch?
>
> Mimi

Sure.. it is used in PATCH 15.

>> ---
>>  security/integrity/ima/ima.h        |  1 +
>>  security/integrity/ima/ima_crypto.c | 11 +++++++++--
>>  2 files changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
>> index f4c1e8dd..a5d5ccb 100644
>> --- a/security/integrity/ima/ima.h
>> +++ b/security/integrity/ima/ima.h
>> @@ -98,6 +98,7 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation,
>>  			   const char *op, struct inode *inode,
>>  			   const unsigned char *filename);
>>  int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
>> +int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash);
>>  int ima_calc_field_array_hash(struct ima_field_data *field_data,
>>  			      struct ima_template_desc *desc, int num_fields,
>>  			      struct ima_digest_data *hash);
>> diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
>> index 139e7f7..50c78c0 100644
>> --- a/security/integrity/ima/ima_crypto.c
>> +++ b/security/integrity/ima/ima_crypto.c
>> @@ -434,13 +434,13 @@ static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data,
>>  		u8 *data_to_hash = field_data[i].data;
>>  		u32 datalen = field_data[i].len;
>>
>> -		if (strcmp(td->name, IMA_TEMPLATE_IMA_NAME) != 0) {
>> +		if (td && strcmp(td->name, IMA_TEMPLATE_IMA_NAME) != 0) {
>>  			rc = crypto_shash_update(&desc.shash,
>>  						(const u8 *) &field_data[i].len,
>>  						sizeof(field_data[i].len));
>>  			if (rc)
>>  				break;
>> -		} else if (strcmp(td->fields[i]->field_id, "n") == 0) {
>> +		} else if (td && strcmp(td->fields[i]->field_id, "n") == 0) {
>>  			memcpy(buffer, data_to_hash, datalen);
>>  			data_to_hash = buffer;
>>  			datalen = IMA_EVENT_NAME_LEN_MAX + 1;
>> @@ -475,6 +475,13 @@ int ima_calc_field_array_hash(struct ima_field_data *field_data,
>>  	return rc;
>>  }
>>
>> +int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
>> +{
>> +	struct ima_field_data fd = { .data = (u8 *)buf, .len = len };
>> +
>> +	return ima_calc_field_array_hash(&fd, NULL, 1, hash);
>> +}
>> +
>>  static void __init ima_pcrread(int idx, u8 *pcr)
>>  {
>>  	if (!ima_used_chip)
>
>

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