dm/connector: Only process connector packages from privileged processes

(cherry picked from commit 93136335f9ad7a98b92eacda1b43dccbf063cd07)

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
index 1327e1a684df37f1fe7e02689260d8f4b029af80..54abf9e303b7d66c4f41de1ef1ff17197572d292 100644 (file)
--- a/drivers/md/dm-log-userspace-transfer.c
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -133,6 +133,9 @@ static void cn_ulog_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
 {
        struct dm_ulog_request *tfr = (struct dm_ulog_request *)(msg + 1);
 
+       if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN))
+               return;
+
        spin_lock(&receiving_list_lock);
        if (msg->len == 0)
                fill_pkg(msg, NULL);