[NetLabel]: Correctly initialize the NetLabel fields.

Fix a problem where the NetLabel specific fields of the sk_security_struct
structure were not being initialized early enough in some cases.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 67 insertions, 2 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 180b26b97d2..5a66c4c09f7 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -281,6 +281,8 @@ static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
         ssec->sid = SECINITSID_UNLABELED;
         sk->sk_security = ssec;
 
+        selinux_netlbl_sk_security_init(ssec, family);
+
         return 0;
 }
 
@@ -3585,6 +3587,8 @@ static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
 
         newssec->sid = ssec->sid;
         newssec->peer_sid = ssec->peer_sid;
+
+        selinux_netlbl_sk_clone_security(ssec, newssec);
 }
 
 static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
@@ -3648,6 +3652,8 @@ static void selinux_inet_csk_clone(struct sock *newsk,
            new socket in sync, but we don't have the isec available yet.
            So we will wait until sock_graft to do it, by which
            time it will have been created and available. */
+
+        selinux_netlbl_sk_security_init(newsksec, req->rsk_ops->family);
 }
 
 static void selinux_req_classify_flow(const struct request_sock *req,
diff --git a/security/selinux/include/selinux_netlabel.h b/security/selinux/include/selinux_netlabel.h
index 88c463eef1e..d885d880540 100644
--- a/security/selinux/include/selinux_netlabel.h
+++ b/security/selinux/include/selinux_netlabel.h
@@ -39,6 +39,10 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                 struct avc_audit_data *ad);
 u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock);
 u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb);
+void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec,
+                                     int family);
+void selinux_netlbl_sk_clone_security(struct sk_security_struct *ssec,
+                                      struct sk_security_struct *newssec);
 
 int __selinux_netlbl_inode_permission(struct inode *inode, int mask);
 /**
@@ -115,6 +119,20 @@ static inline u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb)
         return SECSID_NULL;
 }
 
+static inline void selinux_netlbl_sk_security_init(
+                                               struct sk_security_struct *ssec,
+                                               int family)
+{
+        return;
+}
+
+static inline void selinux_netlbl_sk_clone_security(
+                                           struct sk_security_struct *ssec,
+                                           struct sk_security_struct *newssec)
+{
+        return;
+}
+
 static inline int selinux_netlbl_inode_permission(struct inode *inode,
                                                   int mask)
 {
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 910afa1ffc3..835b485b2af 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -2423,6 +2423,45 @@ netlbl_socket_setsid_return:
 }
 
 /**
+ * selinux_netlbl_sk_security_init - Setup the NetLabel fields
+ * @ssec: the sk_security_struct
+ * @family: the socket family
+ *
+ * Description:
+ * Called when a new sk_security_struct is allocated to initialize the NetLabel
+ * fields.
+ *
+ */
+void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec,
+                                     int family)
+{
+        if (family == PF_INET)
+                ssec->nlbl_state = NLBL_REQUIRE;
+        else
+                ssec->nlbl_state = NLBL_UNSET;
+}
+
+/**
+ * selinux_netlbl_sk_clone_security - Copy the NetLabel fields
+ * @ssec: the original sk_security_struct
+ * @newssec: the cloned sk_security_struct
+ *
+ * Description:
+ * Clone the NetLabel specific sk_security_struct fields from @ssec to
+ * @newssec.
+ *
+ */
+void selinux_netlbl_sk_clone_security(struct sk_security_struct *ssec,
+                                      struct sk_security_struct *newssec)
+{
+        newssec->sclass = ssec->sclass;
+        if (ssec->nlbl_state != NLBL_UNSET)
+                newssec->nlbl_state = NLBL_REQUIRE;
+        else
+                newssec->nlbl_state = NLBL_UNSET;
+}
+
+/**
  * selinux_netlbl_socket_post_create - Label a socket using NetLabel
  * @sock: the socket to label
  * @sock_family: the socket family
@@ -2440,10 +2479,11 @@ int selinux_netlbl_socket_post_create(struct socket *sock,
         struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
         struct sk_security_struct *sksec = sock->sk->sk_security;
 
+        sksec->sclass = isec->sclass;
+
         if (sock_family != PF_INET)
                 return 0;
 
-        sksec->sclass = isec->sclass;
         sksec->nlbl_state = NLBL_REQUIRE;
         return selinux_netlbl_socket_setsid(sock, sid);
 }
@@ -2463,12 +2503,13 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
         struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
         struct sk_security_struct *sksec = sk->sk_security;
 
+        sksec->sclass = isec->sclass;
+
         if (sk->sk_family != PF_INET)
                 return;
 
         sksec->nlbl_state = NLBL_REQUIRE;
         sksec->peer_sid = sksec->sid;
-        sksec->sclass = isec->sclass;
 
         /* Try to set the NetLabel on the socket to save time later, if we fail
          * here we will pick up the pieces in later calls to