linux-kernel - [PATCH 5.15 010/139] selinux: fix misuse of mutex_is

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Date:   Mon, 28 Feb 2022 18:23:04 +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, Ondrej Mosnacek <omosnace@...hat.com>,
        Paul Moore <paul@...l-moore.com>
Subject: [PATCH 5.15 010/139] selinux: fix misuse of mutex_is_locked()

From: Ondrej Mosnacek <omosnace@...hat.com>

commit ce2fc710c9d2b25afc710f49bb2065b4439a62bc upstream.

mutex_is_locked() tests whether the mutex is locked *by any task*, while
here we want to test if it is held *by the current task*. To avoid
false/missed WARNINGs, use lockdep_assert_is_held() and
lockdep_assert_is_not_held() instead, which do the right thing (though
they are a no-op if CONFIG_LOCKDEP=n).

Cc: stable@...r.kernel.org
Fixes: 2554a48f4437 ("selinux: measure state and policy capabilities")
Signed-off-by: Ondrej Mosnacek <omosnace@...hat.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 security/selinux/ima.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/security/selinux/ima.c
+++ b/security/selinux/ima.c
@@ -77,7 +77,7 @@ void selinux_ima_measure_state_locked(st
 	size_t policy_len;
 	int rc = 0;
 
-	WARN_ON(!mutex_is_locked(&state->policy_mutex));
+	lockdep_assert_held(&state->policy_mutex);
 
 	state_str = selinux_ima_collect_state(state);
 	if (!state_str) {
@@ -117,7 +117,7 @@ void selinux_ima_measure_state_locked(st
  */
 void selinux_ima_measure_state(struct selinux_state *state)
 {
-	WARN_ON(mutex_is_locked(&state->policy_mutex));
+	lockdep_assert_not_held(&state->policy_mutex);
 
 	mutex_lock(&state->policy_mutex);
 	selinux_ima_measure_state_locked(state);