diff options
| author | Roberto Sassu <roberto.sassu@huawei.com> | 2020-03-25 11:47:09 +0100 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2020-04-19 22:03:39 -0400 |
| commit | aa724fe18a8a8285d0071c3bfc932efb090d142d (patch) | |
| tree | 87fc69a1f17ebe723ebb9a16ff82ae4432e43379 /security/integrity/ima/ima_crypto.c | |
| parent | 7ca79645a1f8837c3850b881a2c0b43cfba5dc36 (diff) | |
ima: Switch to dynamically allocated buffer for template digests
This patch dynamically allocates the array of tpm_digest structures in
ima_alloc_init_template() and ima_restore_template_data(). The size of the
array is equal to the number of PCR banks plus ima_extra_slots, to make
room for SHA1 and the IMA default hash algorithm, when PCR banks with those
algorithms are not allocated.
Calculating the SHA1 digest is mandatory, as SHA1 still remains the default
hash algorithm for the measurement list. When IMA will support the Crypto
Agile format, remaining digests will be also provided.
The position in the measurement entry array of the SHA1 digest is stored in
the ima_sha1_idx global variable and is determined at IMA initialization
time.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security/integrity/ima/ima_crypto.c')
| -rw-r--r-- | security/integrity/ima/ima_crypto.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index 03d73a4009ab..fe02eb28b32b 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -57,6 +57,13 @@ MODULE_PARM_DESC(ahash_bufsize, "Maximum ahash buffer size"); static struct crypto_shash *ima_shash_tfm; static struct crypto_ahash *ima_ahash_tfm; +int ima_sha1_idx __ro_after_init; +/* + * Additional number of slots reserved, as needed, for SHA1 + * and IMA default algo. + */ +int ima_extra_slots __ro_after_init = 1; + int __init ima_init_crypto(void) { long rc; @@ -502,7 +509,8 @@ static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data, } if (!rc) - rc = crypto_shash_final(shash, entry->digest); + rc = crypto_shash_final(shash, + entry->digests[ima_sha1_idx].digest); return rc; } |