ima: Do not print policy rule with inactive LSM labels

Before printing a policy rule scan for inactive LSM labels in the policy
rule. Inactive LSM labels are identified by args_p != NULL and
rule == NULL.

Fixes: 483ec26eed42 ("ima: ima/lsm policy rule loading logic bug fixes")
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Cc: <stable@vger.kernel.org> # v5.6+
Acked-by: Christian Brauner <brauner@kernel.org>
[zohar@linux.ibm.com: Updated "Fixes" tag]
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 320ca80..2a1f641 100644 (file)
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1967,6 +1967,14 @@ int ima_policy_show(struct seq_file *m, void *v)
 
        rcu_read_lock();
 
+       /* Do not print rules with inactive LSM labels */
+       for (i = 0; i < MAX_LSM_RULES; i++) {
+               if (entry->lsm[i].args_p && !entry->lsm[i].rule) {
+                       rcu_read_unlock();
+                       return 0;
+               }
+       }
+
        if (entry->action & MEASURE)
                seq_puts(m, pt(Opt_measure));
        if (entry->action & DONT_MEASURE)