diff mbox series

[v9,13/23] ima: Only accept AUDIT rules for non-init_ima_ns namespaces for now

Message ID 20220125224645.79319-14-stefanb@linux.vnet.ibm.com (mailing list archive)
State New, archived
Headers show
Series ima: Namespace IMA with audit support in IMA-ns | expand

Commit Message

Stefan Berger Jan. 25, 2022, 10:46 p.m. UTC 
From: Stefan Berger <stefanb@linux.ibm.com>

Only accept AUDIT rules for non-init_ima_ns namespaces rejecting all rules
that require support for measuring, appraisal, and hashing.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

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

Comments

Christian Brauner Jan. 26, 2022, 1:44 p.m. UTC | #1 
On Tue, Jan 25, 2022 at 05:46:35PM -0500, Stefan Berger wrote:
> From: Stefan Berger <stefanb@linux.ibm.com>
> 
> Only accept AUDIT rules for non-init_ima_ns namespaces rejecting all rules
> that require support for measuring, appraisal, and hashing.
> 
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> 
> ---

Okay, seems sensible,
Acked-by: Christian Brauner <brauner@kernel.org>
diff mbox series

Patch

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 3b754b9f5ef7..e8140e73d80b 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1794,6 +1794,17 @@  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;
@@ -1806,6 +1817,7 @@  static int ima_parse_rule(struct ima_namespace *ns,
 		check_template_modsig(template_desc);
 	}
 
+err_audit:
 	audit_log_format(ab, "res=%d", !result);
 	audit_log_end(ab);
 	return result;