linux-kernel - [PATCH 3.18 20/58] selinux: skip bounded transition processing if the policy isnt loaded

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Date:   Fri, 23 Feb 2018 19:26:19 +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, syzbot <syzkaller-bugs@...glegroups.com>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        James Morris <james.l.morris@...cle.com>
Subject: [PATCH 3.18 20/58] selinux: skip bounded transition processing if the policy isnt loaded

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paul Moore <paul@...l-moore.com>

commit 4b14752ec4e0d87126e636384cf37c8dd9df157c upstream.

We can't do anything reasonable in security_bounded_transition() if we
don't have a policy loaded, and in fact we could run into problems
with some of the code inside expecting a policy.  Fix these problems
like we do many others in security/selinux/ss/services.c by checking
to see if the policy is loaded (ss_initialized) and returning quickly
if it isn't.

Reported-by: syzbot <syzkaller-bugs@...glegroups.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Acked-by: Stephen Smalley <sds@...ho.nsa.gov>
Reviewed-by: James Morris <james.l.morris@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/selinux/ss/services.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -823,6 +823,9 @@ int security_bounded_transition(u32 old_
 	int index;
 	int rc;
 
+	if (!ss_initialized)
+		return 0;
+
 	read_lock(&policy_rwlock);
 
 	rc = -EINVAL;