Merge tag 'selinux-pr-20180516' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / security / selinux / hooks.c

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 4cafe6a19167613cb64b29ac59c895e91285b390..be5817df0a9d98eab91b059d814f27322d8e7665 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4576,6 +4576,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
 {
        struct sock *sk = sock->sk;
+       struct sk_security_struct *sksec = sk->sk_security;
        u16 family;
        int err;
 
@@ -4587,11 +4588,11 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
        family = sk->sk_family;
        if (family == PF_INET || family == PF_INET6) {
                char *addrp;
-               struct sk_security_struct *sksec = sk->sk_security;
                struct common_audit_data ad;
                struct lsm_network_audit net = {0,};
                struct sockaddr_in *addr4 = NULL;
                struct sockaddr_in6 *addr6 = NULL;
+               u16 family_sa = address->sa_family;
                unsigned short snum;
                u32 sid, node_perm;
 
@@ -4601,11 +4602,20 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
                 * need to check address->sa_family as it is possible to have
                 * sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
                 */
-               switch (address->sa_family) {
+               switch (family_sa) {
+               case AF_UNSPEC:
                case AF_INET:
                        if (addrlen < sizeof(struct sockaddr_in))
                                return -EINVAL;
                        addr4 = (struct sockaddr_in *)address;
+                       if (family_sa == AF_UNSPEC) {
+                               /* see __inet_bind(), we only want to allow
+                                * AF_UNSPEC if the address is INADDR_ANY
+                                */
+                               if (addr4->sin_addr.s_addr != htonl(INADDR_ANY))
+                                       goto err_af;
+                               family_sa = AF_INET;
+                       }
                        snum = ntohs(addr4->sin_port);
                        addrp = (char *)&addr4->sin_addr.s_addr;
                        break;
@@ -4617,15 +4627,14 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
                        addrp = (char *)&addr6->sin6_addr.s6_addr;
                        break;
                default:
-                       /* Note that SCTP services expect -EINVAL, whereas
-                        * others expect -EAFNOSUPPORT.
-                        */
-                       if (sksec->sclass == SECCLASS_SCTP_SOCKET)
-                               return -EINVAL;
-                       else
-                               return -EAFNOSUPPORT;
+                       goto err_af;
                }
 
+               ad.type = LSM_AUDIT_DATA_NET;
+               ad.u.net = &net;
+               ad.u.net->sport = htons(snum);
+               ad.u.net->family = family_sa;
+
                if (snum) {
                        int low, high;
 
@@ -4637,10 +4646,6 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
                                                      snum, &sid);
                                if (err)
                                        goto out;
-                               ad.type = LSM_AUDIT_DATA_NET;
-                               ad.u.net = &net;
-                               ad.u.net->sport = htons(snum);
-                               ad.u.net->family = family;
                                err = avc_has_perm(&selinux_state,
                                                   sksec->sid, sid,
                                                   sksec->sclass,
@@ -4672,16 +4677,11 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
                        break;
                }
 
-               err = sel_netnode_sid(addrp, family, &sid);
+               err = sel_netnode_sid(addrp, family_sa, &sid);
                if (err)
                        goto out;
 
-               ad.type = LSM_AUDIT_DATA_NET;
-               ad.u.net = &net;
-               ad.u.net->sport = htons(snum);
-               ad.u.net->family = family;
-
-               if (address->sa_family == AF_INET)
+               if (family_sa == AF_INET)
                        ad.u.net->v4info.saddr = addr4->sin_addr.s_addr;
                else
                        ad.u.net->v6info.saddr = addr6->sin6_addr;
@@ -4694,6 +4694,11 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
        }
 out:
        return err;
+err_af:
+       /* Note that SCTP services expect -EINVAL, others -EAFNOSUPPORT. */
+       if (sksec->sclass == SECCLASS_SCTP_SOCKET)
+               return -EINVAL;
+       return -EAFNOSUPPORT;
 }
 
 /* This supports connect(2) and SCTP connect services such as sctp_connectx(3)
@@ -4771,7 +4776,7 @@ static int selinux_socket_connect_helper(struct socket *sock,
                ad.type = LSM_AUDIT_DATA_NET;
                ad.u.net = &net;
                ad.u.net->dport = htons(snum);
-               ad.u.net->family = sk->sk_family;
+               ad.u.net->family = address->sa_family;
                err = avc_has_perm(&selinux_state,
                                   sksec->sid, sid, sksec->sclass, perm, &ad);
                if (err)
@@ -5272,6 +5277,7 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
        while (walk_size < addrlen) {
                addr = addr_buf;
                switch (addr->sa_family) {
+               case AF_UNSPEC:
                case AF_INET:
                        len = sizeof(struct sockaddr_in);
                        break;
@@ -5279,7 +5285,7 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
                        len = sizeof(struct sockaddr_in6);
                        break;
                default:
-                       return -EAFNOSUPPORT;
+                       return -EINVAL;
                }
 
                err = -EINVAL;