net: fix multithreaded signal handling in unix recv routines

The unix_dgram_recvmsg and unix_stream_recvmsg routines in
net/af_unix.c utilize mutex_lock(&u->readlock) calls in order to
serialize read operations of multiple threads on a single socket. This
implies that, if all n threads of a process block in an AF_UNIX recv
call trying to read data from the same socket, one of these threads
will be sleeping in state TASK_INTERRUPTIBLE and all others in state
TASK_UNINTERRUPTIBLE. Provided that a particular signal is supposed to
be handled by a signal handler defined by the process and that none of
this threads is blocking the signal, the complete_signal routine in
kernel/signal.c will select the 'first' such thread it happens to
encounter when deciding which thread to notify that a signal is
supposed to be handled and if this is one of the TASK_UNINTERRUPTIBLE
threads, the signal won't be handled until the one thread not blocking
on the u->readlock mutex is woken up because some data to process has
arrived (if this ever happens). The included patch fixes this by
changing mutex_lock to mutex_lock_interruptible and handling possible
error returns in the same way interruptions are handled by the actual
receive-code.

Signed-off-by: Rainer Weikusat <rweikusat@mobileactivedefense.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index dd419d2..437a99e 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1724,7 +1724,11 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
 
        msg->msg_namelen = 0;
 
-       mutex_lock(&u->readlock);
+       err = mutex_lock_interruptible(&u->readlock);
+       if (err) {
+               err = sock_intr_errno(sock_rcvtimeo(sk, noblock));
+               goto out;
+       }
 
        skb = skb_recv_datagram(sk, flags, noblock, &err);
        if (!skb) {
@@ -1864,7 +1868,11 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
                memset(&tmp_scm, 0, sizeof(tmp_scm));
        }
 
-       mutex_lock(&u->readlock);
+       err = mutex_lock_interruptible(&u->readlock);
+       if (err) {
+               err = sock_intr_errno(timeo);
+               goto out;
+       }
 
        do {
                int chunk;
@@ -1895,11 +1903,12 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
 
                        timeo = unix_stream_data_wait(sk, timeo);
 
-                       if (signal_pending(current)) {
+                       if (signal_pending(current)
+                           ||  mutex_lock_interruptible(&u->readlock)) {
                                err = sock_intr_errno(timeo);
                                goto out;
                        }
-                       mutex_lock(&u->readlock);
+
                        continue;
  unlock:
                        unix_state_unlock(sk);