1 files changed, 35 insertions, 16 deletions

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 54c475f98ce1..20cffd32dc9e 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -398,12 +398,6 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
 
 		nentry->lsm[i].type = entry->lsm[i].type;
 		nentry->lsm[i].args_p = entry->lsm[i].args_p;
-		/*
-		 * Remove the reference from entry so that the associated
-		 * memory will not be freed during a later call to
-		 * ima_lsm_free_rule(entry).
-		 */
-		entry->lsm[i].args_p = NULL;
 
 		ima_filter_rule_init(nentry->lsm[i].type, Audit_equal,
 				     nentry->lsm[i].args_p,
@@ -417,6 +411,7 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
 
 static int ima_lsm_update_rule(struct ima_rule_entry *entry)
 {
+	int i;
 	struct ima_rule_entry *nentry;
 
 	nentry = ima_lsm_copy_rule(entry);
@@ -431,7 +426,8 @@ static int ima_lsm_update_rule(struct ima_rule_entry *entry)
 	 * references and the entry itself. All other memory references will now
 	 * be owned by nentry.
 	 */
-	ima_lsm_free_rule(entry);
+	for (i = 0; i < MAX_LSM_RULES; i++)
+		ima_filter_rule_free(entry->lsm[i].rule);
 	kfree(entry);
 
 	return 0;
@@ -549,6 +545,9 @@ static bool ima_match_rules(struct ima_rule_entry *rule,
 			    const char *func_data)
 {
 	int i;
+	bool result = false;
+	struct ima_rule_entry *lsm_rule = rule;
+	bool rule_reinitialized = false;
 
 	if ((rule->flags & IMA_FUNC) &&
 	    (rule->func != func && func != POST_SETATTR))
@@ -612,35 +611,55 @@ static bool ima_match_rules(struct ima_rule_entry *rule,
 		int rc = 0;
 		u32 osid;
 
-		if (!rule->lsm[i].rule) {
-			if (!rule->lsm[i].args_p)
+		if (!lsm_rule->lsm[i].rule) {
+			if (!lsm_rule->lsm[i].args_p)
 				continue;
 			else
 				return false;
 		}
+
+retry:
 		switch (i) {
 		case LSM_OBJ_USER:
 		case LSM_OBJ_ROLE:
 		case LSM_OBJ_TYPE:
 			security_inode_getsecid(inode, &osid);
-			rc = ima_filter_rule_match(osid, rule->lsm[i].type,
+			rc = ima_filter_rule_match(osid, lsm_rule->lsm[i].type,
 						   Audit_equal,
-						   rule->lsm[i].rule);
+						   lsm_rule->lsm[i].rule);
 			break;
 		case LSM_SUBJ_USER:
 		case LSM_SUBJ_ROLE:
 		case LSM_SUBJ_TYPE:
-			rc = ima_filter_rule_match(secid, rule->lsm[i].type,
+			rc = ima_filter_rule_match(secid, lsm_rule->lsm[i].type,
 						   Audit_equal,
-						   rule->lsm[i].rule);
+						   lsm_rule->lsm[i].rule);
 			break;
 		default:
 			break;
 		}
-		if (!rc)
-			return false;
+
+		if (rc == -ESTALE && !rule_reinitialized) {
+			lsm_rule = ima_lsm_copy_rule(rule);
+			if (lsm_rule) {
+				rule_reinitialized = true;
+				goto retry;
+			}
+		}
+		if (!rc) {
+			result = false;
+			goto out;
+		}
 	}
-	return true;
+	result = true;
+
+out:
+	if (rule_reinitialized) {
+		for (i = 0; i < MAX_LSM_RULES; i++)
+			ima_filter_rule_free(lsm_rule->lsm[i].rule);
+		kfree(lsm_rule);
+	}
+	return result;
 }
 
 /*