[PATCH 3/5] audit: add netlink audit protocol bind to check capabilities on multicast join
Register a netlink per-protocol bind fuction for audit to check userspace
process capabilities before allowing a multicast group connection.
Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com>
---
kernel/audit.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index b5b2f72..f2d2d61 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1050,10 +1050,20 @@ static void audit_receive(struct sk_buff *skb)
mutex_unlock(&audit_cmd_mutex);
}
+/* Run custom bind function on netlink socket group connect or bind requests. */
+static int audit_bind(int group)
+{
+ if (!capable(CAP_AUDIT_READ))
+ return -EPERM;
+
+ return 0;
+}
+
static int __net_init audit_net_init(struct net *net)
{
struct netlink_kernel_cfg cfg = {
.input = audit_receive,
+ .bind = audit_bind,
};
struct audit_net *aunet = net_generic(net, audit_net_id);
--
1.7.1