af_unix: add compat_ioctl support

commit 5f6beb9e0f633f3cc845cdd67973c506372931b4 upstream.

The af_unix protocol family has a custom ioctl command (inexplicibly
based on SIOCPROTOPRIVATE), but never had a compat_ioctl handler for
32-bit applications.

Since all commands are compatible here, add a trivial wrapper that
performs the compat_ptr() conversion for SIOCOUTQ/SIOCINQ.  SIOCUNIXFILE
does not use the argument, but it doesn't hurt to also use compat_ptr()
here.

Fixes: ba94f3088b79 ("unix: add ioctl to open a unix socket file with O_PATH")
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index d2d6ff0..2318e2e 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -649,6 +649,9 @@ static __poll_t unix_poll(struct file *, struct socket *, poll_table *);
 static __poll_t unix_dgram_poll(struct file *, struct socket *,
                                    poll_table *);
 static int unix_ioctl(struct socket *, unsigned int, unsigned long);
+#ifdef CONFIG_COMPAT
+static int unix_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
+#endif
 static int unix_shutdown(struct socket *, int);
 static int unix_stream_sendmsg(struct socket *, struct msghdr *, size_t);
 static int unix_stream_recvmsg(struct socket *, struct msghdr *, size_t, int);
@@ -690,6 +693,9 @@ static const struct proto_ops unix_stream_ops = {
        .getname =      unix_getname,
        .poll =         unix_poll,
        .ioctl =        unix_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl = unix_compat_ioctl,
+#endif
        .listen =       unix_listen,
        .shutdown =     unix_shutdown,
        .setsockopt =   sock_no_setsockopt,
@@ -713,6 +719,9 @@ static const struct proto_ops unix_dgram_ops = {
        .getname =      unix_getname,
        .poll =         unix_dgram_poll,
        .ioctl =        unix_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl = unix_compat_ioctl,
+#endif
        .listen =       sock_no_listen,
        .shutdown =     unix_shutdown,
        .setsockopt =   sock_no_setsockopt,
@@ -735,6 +744,9 @@ static const struct proto_ops unix_seqpacket_ops = {
        .getname =      unix_getname,
        .poll =         unix_dgram_poll,
        .ioctl =        unix_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl = unix_compat_ioctl,
+#endif
        .listen =       unix_listen,
        .shutdown =     unix_shutdown,
        .setsockopt =   sock_no_setsockopt,
@@ -2646,6 +2658,13 @@ static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
        return err;
 }
 
+#ifdef CONFIG_COMPAT
+static int unix_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+       return unix_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static __poll_t unix_poll(struct file *file, struct socket *sock, poll_table *wait)
 {
        struct sock *sk = sock->sk;