linux-kernel - [PATCH v14 12/26] ima: Only accept AUDIT rules for non-init_ima

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Date:   Thu, 15 Sep 2022 15:32:07 -0400
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     linux-integrity@...r.kernel.org
Cc:     zohar@...ux.ibm.com, serge@...lyn.com, brauner@...nel.org,
        containers@...ts.linux.dev, dmitry.kasatkin@...il.com,
        ebiederm@...ssion.com, krzysztof.struczynski@...wei.com,
        roberto.sassu@...wei.com, mpeters@...hat.com, lhinds@...hat.com,
        lsturman@...hat.com, puiterwi@...hat.com, jejb@...ux.ibm.com,
        jamjoom@...ibm.com, linux-kernel@...r.kernel.org,
        paul@...l-moore.com, rgb@...hat.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org,
        jpenumak@...hat.com, Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH v14 12/26] ima: Only accept AUDIT rules for non-init_ima_ns namespaces for now

For non-init_ima_ns namespaces, only accept AUDIT rules for now. Reject
all rules that require support for measuring, appraisal, and hashing.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
Acked-by: Christian Brauner <brauner@...nel.org>
Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>

---
v9:
  - Jump to err_audit when unsupported rules are detected
---
 security/integrity/ima/ima_policy.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 18fd19ecb402..e81eebc7d41e 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1865,6 +1865,17 @@ static int ima_parse_rule(struct ima_namespace *ns,
 			result = -EINVAL;
 			break;
 		}
+
+		/* IMA namespace only accepts AUDIT rules */
+		if (ns != &init_ima_ns && result == 0) {
+			switch (entry->action) {
+			case MEASURE:
+			case APPRAISE:
+			case HASH:
+				result = -EINVAL;
+				goto err_audit;
+			}
+		}
 	}
 	if (!result && !ima_validate_rule(entry))
 		result = -EINVAL;
@@ -1886,6 +1897,7 @@ static int ima_parse_rule(struct ima_namespace *ns,
 				     "verity rules should include d-ngv2");
 	}
 
+err_audit:
 	audit_log_format(ab, "res=%d", !result);
 	audit_log_end(ab);
 	return result;
-- 
2.36.1