af_unix: Avoid socket->sk NULL OOPS in stream connect security hooks.

unix_release() can asynchornously set socket->sk to NULL, and
it does so without holding the unix_state_lock() on "other"
during stream connects.

However, the reverse mapping, sk->sk_socket, is only transitioned
to NULL under the unix_state_lock().

Therefore make the security hooks follow the reverse mapping instead
of the forward mapping.

Reported-by: Jeremy Fitzhardinge <jeremy@goop.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 22 insertions, 24 deletions

diff --git a/include/linux/security.h b/include/linux/security.h
index fd4d55fb8845..d47a4c24b3e4 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -796,8 +796,9 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  * @unix_stream_connect:
  *      Check permissions before establishing a Unix domain stream connection
  *      between @sock and @other.
- *      @sock contains the socket structure.
- *      @other contains the peer socket structure.
+ *      @sock contains the sock structure.
+ *      @other contains the peer sock structure.
+ *      @newsk contains the new sock structure.
  *      Return 0 if permission is granted.
  * @unix_may_send:
  *      Check permissions before connecting or sending datagrams from @sock to
@@ -1568,8 +1569,7 @@ struct security_operations {
         int (*inode_getsecctx)(struct inode *inode, void **ctx, u32 *ctxlen);
 
 #ifdef CONFIG_SECURITY_NETWORK
-        int (*unix_stream_connect) (struct socket *sock,
-                                    struct socket *other, struct sock *newsk);
+        int (*unix_stream_connect) (struct sock *sock, struct sock *other, struct sock *newsk);
         int (*unix_may_send) (struct socket *sock, struct socket *other);
 
         int (*socket_create) (int family, int type, int protocol, int kern);
@@ -2525,8 +2525,7 @@ static inline int security_inode_getsecctx(struct inode *inode, void **ctx, u32
 
 #ifdef CONFIG_SECURITY_NETWORK
 
-int security_unix_stream_connect(struct socket *sock, struct socket *other,
-                                 struct sock *newsk);
+int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk);
 int security_unix_may_send(struct socket *sock,  struct socket *other);
 int security_socket_create(int family, int type, int protocol, int kern);
 int security_socket_post_create(struct socket *sock, int family,
@@ -2567,8 +2566,8 @@ void security_tun_dev_post_create(struct sock *sk);
 int security_tun_dev_attach(struct sock *sk);
 
 #else   /* CONFIG_SECURITY_NETWORK */
-static inline int security_unix_stream_connect(struct socket *sock,
-                                               struct socket *other,
+static inline int security_unix_stream_connect(struct sock *sock,
+                                               struct sock *other,
                                                struct sock *newsk)
 {
         return 0;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 417d7a6c36cf..dd419d286204 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1157,7 +1157,7 @@ restart:
                 goto restart;
         }
 
-        err = security_unix_stream_connect(sock, other->sk_socket, newsk);
+        err = security_unix_stream_connect(sk, other, newsk);
         if (err) {
                 unix_state_unlock(sk);
                 goto out_unlock;
diff --git a/security/capability.c b/security/capability.c
index c773635ca3a0..2a5df2b7da83 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -548,7 +548,7 @@ static int cap_sem_semop(struct sem_array *sma, struct sembuf *sops,
 }
 
 #ifdef CONFIG_SECURITY_NETWORK
-static int cap_unix_stream_connect(struct socket *sock, struct socket *other,
+static int cap_unix_stream_connect(struct sock *sock, struct sock *other,
                                    struct sock *newsk)
 {
         return 0;
diff --git a/security/security.c b/security/security.c
index 1b798d3df710..e5fb07a3052d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -977,8 +977,7 @@ EXPORT_SYMBOL(security_inode_getsecctx);
 
 #ifdef CONFIG_SECURITY_NETWORK
 
-int security_unix_stream_connect(struct socket *sock, struct socket *other,
-                                 struct sock *newsk)
+int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)
 {
         return security_ops->unix_stream_connect(sock, other, newsk);
 }
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c82538a4b1a4..6f637d2678ac 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3921,18 +3921,18 @@ static int selinux_socket_shutdown(struct socket *sock, int how)
         return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN);
 }
 
-static int selinux_socket_unix_stream_connect(struct socket *sock,
-                                              struct socket *other,
+static int selinux_socket_unix_stream_connect(struct sock *sock,
+                                              struct sock *other,
                                               struct sock *newsk)
 {
-        struct sk_security_struct *sksec_sock = sock->sk->sk_security;
-        struct sk_security_struct *sksec_other = other->sk->sk_security;
+        struct sk_security_struct *sksec_sock = sock->sk_security;
+        struct sk_security_struct *sksec_other = other->sk_security;
         struct sk_security_struct *sksec_new = newsk->sk_security;
         struct common_audit_data ad;
         int err;
 
         COMMON_AUDIT_DATA_INIT(&ad, NET);
-        ad.u.net.sk = other->sk;
+        ad.u.net.sk = other;
 
         err = avc_has_perm(sksec_sock->sid, sksec_other->sid,
                            sksec_other->sclass,
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 489a85afa477..ccb71a044a1a 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2408,22 +2408,22 @@ static int smack_setprocattr(struct task_struct *p, char *name,
 
 /**
  * smack_unix_stream_connect - Smack access on UDS
- * @sock: one socket
- * @other: the other socket
+ * @sock: one sock
+ * @other: the other sock
  * @newsk: unused
  *
  * Return 0 if a subject with the smack of sock could access
  * an object with the smack of other, otherwise an error code
  */
-static int smack_unix_stream_connect(struct socket *sock,
-                                     struct socket *other, struct sock *newsk)
+static int smack_unix_stream_connect(struct sock *sock,
+                                     struct sock *other, struct sock *newsk)
 {
-        struct inode *sp = SOCK_INODE(sock);
-        struct inode *op = SOCK_INODE(other);
+        struct inode *sp = SOCK_INODE(sock->sk_socket);
+        struct inode *op = SOCK_INODE(other->sk_socket);
         struct smk_audit_info ad;
 
         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
-        smk_ad_setfield_u_net_sk(&ad, other->sk);
+        smk_ad_setfield_u_net_sk(&ad, other);
         return smk_access(smk_of_inode(sp), smk_of_inode(op),
                                  MAY_READWRITE, &ad);
 }