sctp: add chunks to sk_backlog when the newsk sk_socket is not set

This patch is to fix a NULL-ptr deref in selinux_socket_connect_helper:

  [...] kasan: GPF could be caused by NULL-ptr deref or user memory access
  [...] RIP: 0010:selinux_socket_connect_helper+0x94/0x460
  [...] Call Trace:
  [...]  selinux_sctp_bind_connect+0x16a/0x1d0
  [...]  security_sctp_bind_connect+0x58/0x90
  [...]  sctp_process_asconf+0xa52/0xfd0 [sctp]
  [...]  sctp_sf_do_asconf+0x785/0x980 [sctp]
  [...]  sctp_do_sm+0x175/0x5a0 [sctp]
  [...]  sctp_assoc_bh_rcv+0x285/0x5b0 [sctp]
  [...]  sctp_backlog_rcv+0x482/0x910 [sctp]
  [...]  __release_sock+0x11e/0x310
  [...]  release_sock+0x4f/0x180
  [...]  sctp_accept+0x3f9/0x5a0 [sctp]
  [...]  inet_accept+0xe7/0x720

It was caused by that the 'newsk' sk_socket was not set before going to
security sctp hook when processing asconf chunk with SCTP_PARAM_ADD_IP
or SCTP_PARAM_SET_PRIMARY:

  inet_accept()->
    sctp_accept():
      lock_sock():
          lock listening 'sk'
                                          do_softirq():
                                            sctp_rcv():  <-- [1]
                                                asconf chunk arrives and
                                                enqueued in 'sk' backlog
      sctp_sock_migrate():
          set asoc's sk to 'newsk'
      release_sock():
          sctp_backlog_rcv():
            lock 'newsk'
            sctp_process_asconf()  <-- [2]
            unlock 'newsk'
    sock_graft():
        set sk_socket  <-- [3]

As it shows, at [1] the asconf chunk would be put into the listening 'sk'
backlog, as accept() was holding its sock lock. Then at [2] asconf would
get processed with 'newsk' as asoc's sk had been set to 'newsk'. However,
'newsk' sk_socket is not set until [3], while selinux_sctp_bind_connect()
would deref it, then kernel crashed.

Here to fix it by adding the chunk to sk_backlog until newsk sk_socket is
set when .accept() is done.

Note that sk->sk_socket can be NULL when the sock is closed, so SOCK_DEAD
flag is also needed to check in sctp_newsk_ready().

Thanks to Ondrej for reviewing the code.

Fixes: d452930fd3b9 ("selinux: Add SCTP support")
Reported-by: Ying Xu <yinxu@redhat.com>
Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/net/sctp/input.c b/net/sctp/input.c
index 5a070fb5b278..f2771375bfc0 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -243,7 +243,7 @@ int sctp_rcv(struct sk_buff *skb)
                 bh_lock_sock(sk);
         }
 
-        if (sock_owned_by_user(sk)) {
+        if (sock_owned_by_user(sk) || !sctp_newsk_ready(sk)) {
                 if (sctp_add_backlog(sk, skb)) {
                         bh_unlock_sock(sk);
                         sctp_chunk_free(chunk);
@@ -321,7 +321,7 @@ int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
                 local_bh_disable();
                 bh_lock_sock(sk);
 
-                if (sock_owned_by_user(sk)) {
+                if (sock_owned_by_user(sk) || !sctp_newsk_ready(sk)) {
                         if (sk_add_backlog(sk, skb, sk->sk_rcvbuf))
                                 sctp_chunk_free(chunk);
                         else
@@ -336,7 +336,13 @@ int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
                 if (backloged)
                         return 0;
         } else {
-                sctp_inq_push(inqueue, chunk);
+                if (!sctp_newsk_ready(sk)) {
+                        if (!sk_add_backlog(sk, skb, sk->sk_rcvbuf))
+                                return 0;
+                        sctp_chunk_free(chunk);
+                } else {
+                        sctp_inq_push(inqueue, chunk);
+                }
         }
 
 done: