3 files changed, 23 insertions, 9 deletions

diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index d49bb00..c631b99 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -141,14 +141,17 @@ int evm_update_evmxattr(struct dentry *dentry, const char *xattr_name,
 			const char *xattr_value, size_t xattr_value_len)
 {
 	struct inode *inode = dentry->d_inode;
-	u8 hmac[SHA1_DIGEST_SIZE];
+	struct evm_ima_xattr_data xattr_data;
 	int rc = 0;
 
 	rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
-			   xattr_value_len, hmac);
-	if (rc == 0)
+			   xattr_value_len, xattr_data.digest);
+	if (rc == 0) {
+		xattr_data.type = EVM_XATTR_HMAC;
 		rc = __vfs_setxattr_noperm(dentry, XATTR_NAME_EVM,
-					   hmac, SHA1_DIGEST_SIZE, 0);
+					   &xattr_data,
+					   sizeof(xattr_data), 0);
+	}
 	else if (rc == -ENODATA)
 		rc = inode->i_op->removexattr(dentry, XATTR_NAME_EVM);
 	return rc;
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index a8fa45f..c0580dd 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -51,20 +51,20 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry,
 					     size_t xattr_value_len,
 					     struct integrity_iint_cache *iint)
 {
-	char hmac_val[SHA1_DIGEST_SIZE];
+	struct evm_ima_xattr_data xattr_data;
 	int rc;
 
 	if (iint->hmac_status != INTEGRITY_UNKNOWN)
 		return iint->hmac_status;
 
-	memset(hmac_val, 0, sizeof hmac_val);
 	rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
-			   xattr_value_len, hmac_val);
+			   xattr_value_len, xattr_data.digest);
 	if (rc < 0)
 		return INTEGRITY_UNKNOWN;
 
-	rc = vfs_xattr_cmp(dentry, XATTR_NAME_EVM, hmac_val, sizeof hmac_val,
-			   GFP_NOFS);
+	xattr_data.type = EVM_XATTR_HMAC;
+	rc = vfs_xattr_cmp(dentry, XATTR_NAME_EVM, (u8 *)&xattr_data,
+			   sizeof xattr_data, GFP_NOFS);
 	if (rc < 0)
 		goto err_out;
 	iint->hmac_status = INTEGRITY_PASS;
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 397a46b..7efbf56 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -18,6 +18,17 @@
 /* iint cache flags */
 #define IMA_MEASURED		0x01
 
+enum evm_ima_xattr_type {
+	IMA_XATTR_DIGEST = 0x01,
+	EVM_XATTR_HMAC,
+	EVM_IMA_XATTR_DIGSIG,
+};
+
+struct evm_ima_xattr_data {
+	u8 type;
+	u8 digest[SHA1_DIGEST_SIZE];
+}  __attribute__((packed));
+
 /* integrity data associated with an inode */
 struct integrity_iint_cache {
 	struct rb_node rb_node; /* rooted in integrity_iint_tree */