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audit: handle a clean auditd shutdown with grace
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@paul-moore.com>
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@ -468,6 +468,10 @@ static int kauditd_send_unicast_skb(struct sk_buff *skb)
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{
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int rc;
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/* if we know nothing is connected, don't even try the netlink call */
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if (!audit_pid)
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return -ECONNREFUSED;
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/* get an extra skb reference in case we fail to send */
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skb_get(skb);
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rc = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
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@ -1009,6 +1013,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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audit_pid = new_pid;
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audit_nlk_portid = NETLINK_CB(skb).portid;
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audit_sock = skb->sk;
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if (!new_pid)
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auditd_reset();
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wake_up_interruptible(&kauditd_wait);
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}
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if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
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