sctp: call sctp_auth_init_hmacs() in sctp_sock_migrate()

New ep's auth_hmacs should be set if old ep's is set, in case that
net->sctp.auth_enable has been changed to 0 by users and new ep's
auth_hmacs couldn't be set in sctp_endpoint_init().

It can even crash kernel by doing:

  1. on server: sysctl -w net.sctp.auth_enable=1,
                sysctl -w net.sctp.addip_enable=1,
                sysctl -w net.sctp.addip_noauth_enable=0,
                listen() on server,
                sysctl -w net.sctp.auth_enable=0.
  2. on client: connect() to server.
  3. on server: accept() the asoc,
                sysctl -w net.sctp.auth_enable=1.
  4. on client: send() asconf packet to server.

The call trace:

  [  245.280251] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  [  245.286872] RIP: 0010:sctp_auth_calculate_hmac+0xa3/0x140 [sctp]
  [  245.304572] Call Trace:
  [  245.305091]  <IRQ>
  [  245.311287]  sctp_sf_authenticate+0x110/0x160 [sctp]
  [  245.312311]  sctp_sf_eat_auth+0xf2/0x230 [sctp]
  [  245.313249]  sctp_do_sm+0x9a/0x2d0 [sctp]
  [  245.321483]  sctp_assoc_bh_rcv+0xed/0x1a0 [sctp]
  [  245.322495]  sctp_rcv+0xa66/0xc70 [sctp]

It's because the old ep->auth_hmacs wasn't copied to the new ep while
ep->auth_hmacs is used in sctp_auth_calculate_hmac() when processing
the incoming auth chunks, and it should have been done when migrating
sock.

Reported-by: Ying Xu <yinxu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 44f2acb3d4339cf7b29e439d3b865a620850d183..6140471efd4b8cf851d238a8c80c22858346740e 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -9225,6 +9225,16 @@ static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
        if (err)
                return err;
 
+       /* New ep's auth_hmacs should be set if old ep's is set, in case
+        * that net->sctp.auth_enable has been changed to 0 by users and
+        * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
+        */
+       if (oldsp->ep->auth_hmacs) {
+               err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
+               if (err)
+                       return err;
+       }
+
        /* Move any messages in the old socket's receive queue that are for the
         * peeled off association to the new socket's receive queue.
         */