[PATCH v14 15/26] ima: Implement ima_free_policy_rules() for freeing of an ima_namespace

Stefan Berger
2022-09-15T19:33:07Z

Implement ima_free_policy_rules() to free the current custom IMA policy's
rules. This function will be called when an ima_namespace is freed.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>

---
v10:
- Not calling ima_delete_rules() anymore
- Move access check from ima_delete_rules into very last patch

v9:
- Only reset temp_ima_appraise when using init_ima_ns.
---
security/integrity/ima/ima.h | 1 +
security/integrity/ima/ima_policy.c | 14 ++++++++++++++
2 files changed, 15 insertions(+)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index e662641772fd..528d792c82c1 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -333,6 +333,7 @@ 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 e81eebc7d41e..fb4f08f86330 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1967,6 +1967,20 @@ 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;
+
+ 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[] = {
--
2.36.1