selinux: skip bounded transition processing if the policy isn't loaded

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 <[email protected]>
Signed-off-by: Paul Moore <[email protected]>
Acked-by: Stephen Smalley <[email protected]>
Reviewed-by: James Morris <[email protected]>

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index d05496deb2295a4035e4fab767fdf2315fc6ae67..8900ea5cbabf21313b870dc12978bc81d4342c40 100644 (file)
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -867,6 +867,9 @@ int security_bounded_transition(u32 old_sid, u32 new_sid)
        int index;
        int rc;
 
+       if (!ss_initialized)
+               return 0;
+
        read_lock(&policy_rwlock);
 
        rc = -EINVAL;