[RFC PATCH 8/9] audit: handle a clean auditd shutdown with grace
From: Paul Moore <paul(a)paul-moore.com>
When auditd stops cleanly it sets 'auditd_pid' to 0 with an
AUDIT_SET message, in this case we should reset our backlog
queues via the auditd_reset() function. This patch also adds
a 'auditd_pid' check to the top of kauditd_send_unicast_skb()
so we can fail quicker.
Signed-off-by: Paul Moore <paul(a)paul-moore.com>
---
kernel/audit.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/kernel/audit.c b/kernel/audit.c
index 0572e5d..b447a6b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -468,6 +468,10 @@ static int kauditd_send_unicast_skb(struct sk_buff *skb)
{
int rc;
+ /* if we know nothing is connected, don't even try the netlink call */
+ if (!audit_pid)
+ return -ECONNREFUSED;
+
/* get an extra skb reference in case we fail to send */
skb_get(skb);
rc = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
@@ -1009,6 +1013,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr
*nlh)
audit_pid = new_pid;
audit_nlk_portid = NETLINK_CB(skb).portid;
audit_sock = skb->sk;
+ if (!new_pid)
+ auditd_reset();
wake_up_interruptible(&kauditd_wait);
}
if (s.mask & AUDIT_STATUS_RATE_LIMIT) {