[PATCH v8 11/19] ima: Implement ima_free_policy_rules() for freeing of an ima_namespace

[Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx>]

From: Stefan Berger <stefanb@xxxxxxxxxxxxx>

Implement ima_free_policy_rules() that is needed when an ima_namespace
is freed.

Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
---
 security/integrity/ima/ima.h        |  1 +
 security/integrity/ima/ima_policy.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 0c86a955cedf..1c1e859721ee 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -325,6 +325,7 @@ void ima_update_policy_flags(struct ima_namespace *ns);
 ssize_t ima_parse_add_rule(struct ima_namespace *ns, char *rule);
 void ima_delete_rules(struct ima_namespace *ns);
 int ima_check_policy(struct ima_namespace *ns);
+void ima_free_policy_rules(struct ima_namespace *ns);
 void *ima_policy_start(struct seq_file *m, loff_t *pos);
 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
 void ima_policy_stop(struct seq_file *m, void *v);
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index c265c3b5a9f2..15c68dc5da9e 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1884,6 +1884,22 @@ void ima_delete_rules(struct ima_namespace *ns)
 	}
 }
 
+/**
+ * ima_free_policy_rules - free all policy rules
+ * @ns: IMA namespace that has the policy
+ */
+void ima_free_policy_rules(struct ima_namespace *ns)
+{
+	struct ima_rule_entry *entry, *tmp;
+
+	ima_delete_rules(ns);
+
+	list_for_each_entry_safe(entry, tmp, &ns->ima_policy_rules, list) {
+		list_del(&entry->list);
+		ima_free_rule(entry);
+	}
+}
+
 #define __ima_hook_stringify(func, str)	(#func),
 
 const char *const func_tokens[] = {
-- 
2.31.1