linux-kernel - [PATCH security-next v5 10/30] LSM: Don't ignore initialization failures

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Date:   Wed, 10 Oct 2018 17:18:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     James Morris <jmorris@...ei.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        John Johansen <john.johansen@...onical.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Paul Moore <paul@...l-moore.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Jordan Glover <Golden_Miller83@...tonmail.ch>,
        LSM <linux-security-module@...r.kernel.org>,
        linux-doc@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH security-next v5 10/30] LSM: Don't ignore initialization failures

LSM initialization failures have traditionally been ignored. We should
at least WARN when something goes wrong.

Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Casey Schaufler <casey@...aufler-ca.com>
Reviewed-by: John Johansen <john.johansen@...onical.com>
---
 security/security.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/security/security.c b/security/security.c
index 395f804f6a91..2055af907eba 100644
--- a/security/security.c
+++ b/security/security.c
@@ -55,10 +55,12 @@ static __initdata bool debug;
 static void __init major_lsm_init(void)
 {
 	struct lsm_info *lsm;
+	int ret;
 
 	for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
 		init_debug("initializing %s\n", lsm->name);
-		lsm->init();
+		ret = lsm->init();
+		WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
 	}
 }
 
-- 
2.17.1