proc connector: reject unprivileged listener bumps

While PROC_CN_MCAST_LISTEN/IGNORE is entirely advisory, it was possible
for an unprivileged user to turn off notifications for all listeners by
sending PROC_CN_MCAST_IGNORE. Instead, require the same privileges as
required for a multicast bind.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: stable@vger.kernel.org
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Acked-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index fce2000eec31..1110478dd0fd 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -313,6 +313,12 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg,
             (task_active_pid_ns(current) != &init_pid_ns))
                 return;
 
+        /* Can only change if privileged. */
+        if (!capable(CAP_NET_ADMIN)) {
+                err = EPERM;
+                goto out;
+        }
+
         mc_op = (enum proc_cn_mcast_op *)msg->data;
         switch (*mc_op) {
         case PROC_CN_MCAST_LISTEN:
@@ -325,6 +331,8 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg,
                 err = EINVAL;
                 break;
         }
+
+out:
         cn_proc_ack(err, msg->seq, msg->ack);
 }