Patchwork [6/6] audit: send multicast messages only if there are listeners

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Submitter Richard Guy Briggs
Date April 18, 2014, 5:34 p.m.
Message ID <6f2cbed195664cc9d50eab61ec85d457e6a3079f.1397831970.git.rgb@redhat.com>
Download mbox | patch
Permalink /patch/340388/
State Changes Requested
Delegated to: David Miller
Headers show

Comments

Richard Guy Briggs - April 18, 2014, 5:34 p.m.
Test first to see if there are any userspace multicast listeners bound to the
socket before starting the multicast send work.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 kernel/audit.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Patch

diff --git a/kernel/audit.c b/kernel/audit.c
index d272cc1..33531d7 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -435,6 +435,9 @@  static void kauditd_send_multicast_skb(struct sk_buff *skb)
 	struct audit_net	*aunet = net_generic(&init_net, audit_net_id);
 	struct sock		*sock = aunet->nlsk;
 
+	if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG))
+		return;
+
 	/*
 	 * The seemingly wasteful skb_copy() rather than bumping the refcount
 	 * using skb_get() is necessary because non-standard mods are made to