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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>
This commit is contained in:
Paul Moore 2016-11-29 16:53:26 -05:00
parent e1d1662128
commit 6c54e78996
1 changed files with 6 additions and 0 deletions
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6
kernel/audit.c
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@ -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) {