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| author | Thiago Jung Bauermann <bauerman@linux.ibm.com> | 2019-06-11 03:28:08 -0300 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2019-06-30 17:54:41 -0400 |
| commit | 650b29dbdf2caf7db27cdc8bfa8fc009b28a6ce3 (patch) | |
| tree | 41585db527639befc8ae4ea09619ea40078b0fde /security/integrity/ima | |
| parent | 337619eb44ef663d329c5c19efd18488ce7de492 (diff) | |
| download | talos-op-linux-650b29dbdf2caf7db27cdc8bfa8fc009b28a6ce3.tar.gz talos-op-linux-650b29dbdf2caf7db27cdc8bfa8fc009b28a6ce3.zip | |
integrity: Introduce struct evm_xattr
Even though struct evm_ima_xattr_data includes a fixed-size array to hold a
SHA1 digest, most of the code ignores the array and uses the struct to mean
"type indicator followed by data of unspecified size" and tracks the real
size of what the struct represents in a separate length variable.
The only exception to that is the EVM code, which correctly uses the
definition of struct evm_ima_xattr_data.
So make this explicit in the code by removing the length specification from
the array in struct evm_ima_xattr_data. Also, change the name of the
element from digest to data since in most places the array doesn't hold a
digest.
A separate struct evm_xattr is introduced, with the original definition of
evm_ima_xattr_data to be used in the places that actually expect that
definition, specifically the EVM HMAC code.
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security/integrity/ima')
| -rw-r--r-- | security/integrity/ima/ima_appraise.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 2f6536ab69e8..18bbe753421a 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -168,7 +168,8 @@ enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, return sig->hash_algo; break; case IMA_XATTR_DIGEST_NG: - ret = xattr_value->digest[0]; + /* first byte contains algorithm id */ + ret = xattr_value->data[0]; if (ret < HASH_ALGO__LAST) return ret; break; @@ -176,7 +177,7 @@ enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, /* this is for backward compatibility */ if (xattr_len == 21) { unsigned int zero = 0; - if (!memcmp(&xattr_value->digest[16], &zero, 4)) + if (!memcmp(&xattr_value->data[16], &zero, 4)) return HASH_ALGO_MD5; else return HASH_ALGO_SHA1; @@ -275,7 +276,7 @@ int ima_appraise_measurement(enum ima_hooks func, /* xattr length may be longer. md5 hash in previous version occupied 20 bytes in xattr, instead of 16 */ - rc = memcmp(&xattr_value->digest[hash_start], + rc = memcmp(&xattr_value->data[hash_start], iint->ima_hash->digest, iint->ima_hash->length); else |
