scm: Only support SCM_RIGHTS on unix domain sockets.
We use scm_send and scm_recv on both unix domain and
netlink sockets, but only unix domain sockets support
everything required for file descriptor passing,
so error if someone attempts to pass file descriptors
over netlink sockets.
Cc: stable@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/scm.c b/net/core/scm.c
index b7ba91b..9b26463 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -156,6 +156,8 @@
switch (cmsg->cmsg_type)
{
case SCM_RIGHTS:
+ if (!sock->ops || sock->ops->family != PF_UNIX)
+ goto error;
err=scm_fp_copy(cmsg, &p->fp);
if (err<0)
goto error;