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[PATCH V3 2/2] audit: log failed attempts to change audit_pid configuration

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Failed attempts to change the audit_pid configuration are not presently
logged.  One case is an attempt to starve an old auditd by starting up a
new auditd when the old one is still alive and active.  The other case
is an attempt to orphan a new auditd when an old auditd shuts down.

Log both as AUDIT_CONFIG_CHANGE messages with failure result.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 kernel/audit.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 0368be2..9000c6f 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -882,11 +882,15 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 			int new_pid = s.pid;
 			pid_t requesting_pid = task_tgid_vnr(current);
 
-			if ((!new_pid) && (requesting_pid != audit_pid))
+			if ((!new_pid) && (requesting_pid != audit_pid)) {
+				audit_log_config_change("audit_pid", new_pid, audit_pid, 0);
 				return -EACCES;
+			}
 			if (audit_pid && new_pid &&
-			    audit_replace(requesting_pid) != -ECONNREFUSED)
+			    audit_replace(requesting_pid) != -ECONNREFUSED) {
+				audit_log_config_change("audit_pid", new_pid, audit_pid, 0);
 				return -EEXIST;
+			}
 			if (audit_enabled != AUDIT_OFF)
 				audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
 			audit_pid = new_pid;
-- 
1.7.1

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[PATCH V3 1/2] audit: stop an old auditd being starved out by a new auditd Richard Guy Briggs <rgb@redhat.com> - 2015-12-22 10:10 +0100
  [PATCH V3 2/2] audit: log failed attempts to change audit_pid configuration Richard Guy Briggs <rgb@redhat.com> - 2015-12-22 10:10 +0100
    Re: [PATCH V3 2/2] audit: log failed attempts to change audit_pid configuration Paul Moore <pmoore@redhat.com> - 2015-12-23 00:50 +0100
  Re: [PATCH V3 1/2] audit: stop an old auditd being starved out by a new auditd Paul Moore <pmoore@redhat.com> - 2015-12-22 15:30 +0100
    Re: [PATCH V3 1/2] audit: stop an old auditd being starved out by a new auditd Steve Grubb <sgrubb@redhat.com> - 2015-12-22 16:00 +0100
      Re: [PATCH V3 1/2] audit: stop an old auditd being starved out by a  new auditd Richard Guy Briggs <rgb@redhat.com> - 2015-12-22 16:50 +0100
  Re: [PATCH V3 1/2] audit: stop an old auditd being starved out by a new auditd Paul Moore <pmoore@redhat.com> - 2015-12-23 00:50 +0100

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