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ima: provide dedicated hash algo allocation function 

This patch provides dedicated hash algo allocation and
deallocation function which can be used by different clients.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Dmitry Kasatkin 2013-07-04 17:40:01 +03:00 committed by Mimi Zohar
parent 140d802240
commit 723326b927
1 changed files with 29 additions and 14 deletions
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43
security/integrity/ima/ima_crypto.c
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@ -39,6 +39,28 @@ int ima_init_crypto(void)
return 0;
}
static struct crypto_shash *ima_alloc_tfm(enum hash_algo algo)
{
struct crypto_shash *tfm = ima_shash_tfm;
int rc;
if (algo != ima_hash_algo && algo < HASH_ALGO__LAST) {
tfm = crypto_alloc_shash(hash_algo_name[algo], 0, 0);
if (IS_ERR(tfm)) {
rc = PTR_ERR(tfm);
pr_err("Can not allocate %s (reason: %d)\n",
hash_algo_name[algo], rc);
}
}
return tfm;
}
static void ima_free_tfm(struct crypto_shash *tfm)
{
if (tfm != ima_shash_tfm)
crypto_free_shash(tfm);
}
/*
* Calculate the MD5/SHA1 file digest
*/
@ -57,6 +79,8 @@ static int ima_calc_file_hash_tfm(struct file *file,
desc.shash.tfm = tfm;
desc.shash.flags = 0;
hash->length = crypto_shash_digestsize(tfm);
rc = crypto_shash_init(&desc.shash);
if (rc != 0)
return rc;
@ -98,25 +122,16 @@ out:
int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash)
{
struct crypto_shash *tfm = ima_shash_tfm;
struct crypto_shash *tfm;
int rc;
if (hash->algo != ima_hash_algo && hash->algo < HASH_ALGO__LAST) {
tfm = crypto_alloc_shash(hash_algo_name[hash->algo], 0, 0);
if (IS_ERR(tfm)) {
rc = PTR_ERR(tfm);
pr_err("Can not allocate %s (reason: %d)\n",
hash_algo_name[hash->algo], rc);
return rc;
}
}
hash->length = crypto_shash_digestsize(tfm);
tfm = ima_alloc_tfm(hash->algo);
if (IS_ERR(tfm))
return PTR_ERR(tfm);
rc = ima_calc_file_hash_tfm(file, hash, tfm);
if (tfm != ima_shash_tfm)
crypto_free_shash(tfm);
ima_free_tfm(tfm);
return rc;
}