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authorLinus Torvalds <torvalds@linux-foundation.org>2017-04-12 00:02:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-04-12 00:02:33 -0700
commitb9b3322f13f350587f17f0a76f008830e3a420d3 (patch)
tree4e8a9eda3cd3e7da4baf56b2467587ce32023ea5 /kernel
parent025def92dd6b5b84b0d6d9069e2bb24e51e48c17 (diff)
parent264d509637d95f9404e52ced5003ad352e0f6a26 (diff)
Merge branch 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit
Pull audit fix from Paul Moore: "One more small audit fix, this should be the last for v4.11. Seth Forshee noticed a problem where the audit retry queue wasn't being flushed properly when audit was enabled and the audit daemon wasn't running; this patches fixes the problem (see the commit description for more details on the change). Both Seth and I have tested this and everything looks good" * 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit: audit: make sure we don't let the retry queue grow without bounds
Diffstat (limited to 'kernel')
-rw-r--r--kernel/audit.c67
1 files changed, 32 insertions, 35 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 2f4964cfde0b..a871bf80fde1 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -160,7 +160,6 @@ static LIST_HEAD(audit_freelist);
/* queue msgs to send via kauditd_task */
static struct sk_buff_head audit_queue;
-static void kauditd_hold_skb(struct sk_buff *skb);
/* queue msgs due to temporary unicast send problems */
static struct sk_buff_head audit_retry_queue;
/* queue msgs waiting for new auditd connection */
@@ -454,30 +453,6 @@ static void auditd_set(int pid, u32 portid, struct net *net)
}
/**
- * auditd_reset - Disconnect the auditd connection
- *
- * Description:
- * Break the auditd/kauditd connection and move all the queued records into the
- * hold queue in case auditd reconnects.
- */
-static void auditd_reset(void)
-{
- struct sk_buff *skb;
-
- /* if it isn't already broken, break the connection */
- rcu_read_lock();
- if (auditd_conn.pid)
- auditd_set(0, 0, NULL);
- rcu_read_unlock();
-
- /* flush all of the main and retry queues to the hold queue */
- while ((skb = skb_dequeue(&audit_retry_queue)))
- kauditd_hold_skb(skb);
- while ((skb = skb_dequeue(&audit_queue)))
- kauditd_hold_skb(skb);
-}
-
-/**
* kauditd_print_skb - Print the audit record to the ring buffer
* @skb: audit record
*
@@ -505,9 +480,6 @@ static void kauditd_rehold_skb(struct sk_buff *skb)
{
/* put the record back in the queue at the same place */
skb_queue_head(&audit_hold_queue, skb);
-
- /* fail the auditd connection */
- auditd_reset();
}
/**
@@ -544,9 +516,6 @@ static void kauditd_hold_skb(struct sk_buff *skb)
/* we have no other options - drop the message */
audit_log_lost("kauditd hold queue overflow");
kfree_skb(skb);
-
- /* fail the auditd connection */
- auditd_reset();
}
/**
@@ -567,6 +536,30 @@ static void kauditd_retry_skb(struct sk_buff *skb)
}
/**
+ * auditd_reset - Disconnect the auditd connection
+ *
+ * Description:
+ * Break the auditd/kauditd connection and move all the queued records into the
+ * hold queue in case auditd reconnects.
+ */
+static void auditd_reset(void)
+{
+ struct sk_buff *skb;
+
+ /* if it isn't already broken, break the connection */
+ rcu_read_lock();
+ if (auditd_conn.pid)
+ auditd_set(0, 0, NULL);
+ rcu_read_unlock();
+
+ /* flush all of the main and retry queues to the hold queue */
+ while ((skb = skb_dequeue(&audit_retry_queue)))
+ kauditd_hold_skb(skb);
+ while ((skb = skb_dequeue(&audit_queue)))
+ kauditd_hold_skb(skb);
+}
+
+/**
* auditd_send_unicast_skb - Send a record via unicast to auditd
* @skb: audit record
*
@@ -758,6 +751,7 @@ static int kauditd_thread(void *dummy)
NULL, kauditd_rehold_skb);
if (rc < 0) {
sk = NULL;
+ auditd_reset();
goto main_queue;
}
@@ -767,6 +761,7 @@ static int kauditd_thread(void *dummy)
NULL, kauditd_hold_skb);
if (rc < 0) {
sk = NULL;
+ auditd_reset();
goto main_queue;
}
@@ -775,16 +770,18 @@ main_queue:
* unicast, dump failed record sends to the retry queue; if
* sk == NULL due to previous failures we will just do the
* multicast send and move the record to the retry queue */
- kauditd_send_queue(sk, portid, &audit_queue, 1,
- kauditd_send_multicast_skb,
- kauditd_retry_skb);
+ rc = kauditd_send_queue(sk, portid, &audit_queue, 1,
+ kauditd_send_multicast_skb,
+ kauditd_retry_skb);
+ if (sk == NULL || rc < 0)
+ auditd_reset();
+ sk = NULL;
/* drop our netns reference, no auditd sends past this line */
if (net) {
put_net(net);
net = NULL;
}
- sk = NULL;
/* we have processed all the queues so wake everyone */
wake_up(&audit_backlog_wait);