integrity: invalid kernel parameters feedback

Don't silently ignore unknown or invalid ima_{policy,appraise,hash} and evm
kernel boot command line options.

Signed-off-by: Bruno Meneguele <bmeneg@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

security/integrity/evm/evm_main.c

@@ -59,6 +59,9 @@ static int __init evm_set_fixmode(char *str)
 {
 	if (strncmp(str, "fix", 3) == 0)
 		evm_fixmode = 1;
+	else
+		pr_err("invalid \"%s\" mode", str);
+
 	return 0;
 }
 __setup("evm=", evm_set_fixmode);

security/integrity/ima/ima_appraise.c

@@ -33,6 +33,8 @@ static int __init default_appraise_setup(char *str)
 		ima_appraise = IMA_APPRAISE_FIX;
 	else if (strncmp(str, "enforce", 7) == 0)
 		ima_appraise = IMA_APPRAISE_ENFORCE;
+	else
+		pr_err("invalid \"%s\" appraise option", str);
 #endif
 	return 1;
 }

security/integrity/ima/ima_main.c

@@ -50,18 +50,23 @@ static int __init hash_setup(char *str)
 		return 1;
 
 	if (strcmp(template_desc->name, IMA_TEMPLATE_IMA_NAME) == 0) {
-		if (strncmp(str, "sha1", 4) == 0)
+		if (strncmp(str, "sha1", 4) == 0) {
 			ima_hash_algo = HASH_ALGO_SHA1;
-		else if (strncmp(str, "md5", 3) == 0)
+		} else if (strncmp(str, "md5", 3) == 0) {
 			ima_hash_algo = HASH_ALGO_MD5;
-		else
+		} else {
+			pr_err("invalid hash algorithm \"%s\" for template \"%s\"",
+				str, IMA_TEMPLATE_IMA_NAME);
 			return 1;
+		}
 		goto out;
 	}
 
 	i = match_string(hash_algo_name, HASH_ALGO__LAST, str);
-	if (i < 0)
+	if (i < 0) {
+		pr_err("invalid hash algorithm \"%s\"", str);
 		return 1;
+	}
 
 	ima_hash_algo = i;
 out:

security/integrity/ima/ima_policy.c

@@ -241,6 +241,8 @@ static int __init policy_setup(char *str)
 			ima_use_secure_boot = true;
 		else if (strcmp(p, "fail_securely") == 0)
 			ima_fail_unverifiable_sigs = true;
+		else
+			pr_err("policy \"%s\" not found", p);
 	}
 
 	return 1;