linux-kernel - [PATCH 5.4 04/71] ima: Do not print policy rule with inactive LSM labels

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Message-Id: <20220214092452.169784326@linuxfoundation.org>
Date:   Mon, 14 Feb 2022 10:25:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Berger <stefanb@...ux.ibm.com>,
        Christian Brauner <brauner@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: [PATCH 5.4 04/71] ima: Do not print policy rule with inactive LSM labels

From: Stefan Berger <stefanb@...ux.ibm.com>

commit 89677197ae709eb1ab3646952c44f6a171c9e74c upstream.

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@...ux.ibm.com>
Cc: <stable@...r.kernel.org> # v5.6+
Acked-by: Christian Brauner <brauner@...nel.org>
[zohar@...ux.ibm.com: Updated "Fixes" tag]
Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 security/integrity/ima/ima_policy.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1382,6 +1382,14 @@ int ima_policy_show(struct seq_file *m,
 
 	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)