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ima: do not include field length in template digest calc for ima template

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To maintain compatibility with userspace tools, the field length must not
be included in the template digest calculation for the 'ima' template.

Fixes commit: a71dc65 ima: switch to new template management mechanism

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Roberto Sassu 2013-11-08 19:21:39 +01:00 committed by Mimi Zohar
parent 4c1cc40a2d
commit b6f8f16f41
3 changed files with 15 additions and 6 deletions
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3
security/integrity/ima/ima.h
View File

@ -97,7 +97,8 @@ 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_field_array_hash(struct ima_field_data *field_data, int num_fields,
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);
int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
void ima_add_violation(struct file *file, const unsigned char *filename,

1
security/integrity/ima/ima_api.c
View File

@ -94,6 +94,7 @@ int ima_store_template(struct ima_template_entry *entry,
/* this function uses default algo */
hash.hdr.algo = HASH_ALGO_SHA1;
result = ima_calc_field_array_hash(&entry->template_data[0],
entry->template_desc,
num_fields, &hash.hdr);
if (result < 0) {
integrity_audit_msg(AUDIT_INTEGRITY_PCR, inode,

17
security/integrity/ima/ima_crypto.c
View File

@ -140,6 +140,7 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash)
* Calculate the hash of template data
*/
static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data,
struct ima_template_desc *td,
int num_fields,
struct ima_digest_data *hash,
struct crypto_shash *tfm)
@ -160,9 +161,13 @@ static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data,
return rc;
for (i = 0; i < num_fields; i++) {
rc = crypto_shash_update(&desc.shash,
(const u8 *) &field_data[i].len,
sizeof(field_data[i].len));
if (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;
}
rc = crypto_shash_update(&desc.shash, field_data[i].data,
field_data[i].len);
if (rc)
@ -175,7 +180,8 @@ static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data,
return rc;
}
int ima_calc_field_array_hash(struct ima_field_data *field_data, int num_fields,
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)
{
struct crypto_shash *tfm;
@ -185,7 +191,8 @@ int ima_calc_field_array_hash(struct ima_field_data *field_data, int num_fields,
if (IS_ERR(tfm))
return PTR_ERR(tfm);
rc = ima_calc_field_array_hash_tfm(field_data, num_fields, hash, tfm);
rc = ima_calc_field_array_hash_tfm(field_data, desc, num_fields,
hash, tfm);
ima_free_tfm(tfm);