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authorLinus Torvalds <torvalds@linux-foundation.org>2021-12-16 15:24:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-12-16 15:24:46 -0800
commit6441998e2e37131b0a4c310af9156d79d3351c16 (patch)
tree32e0abbcafad04bd3704df7bb16139b66228a4e5
parent180f3bcfe3622bb78307dcc4fe1f8f4a717ee0ba (diff)
parentf4b3ee3c85551d2d343a3ba159304066523f730f (diff)
downloadlwn-6441998e2e37131b0a4c310af9156d79d3351c16.tar.gz
lwn-6441998e2e37131b0a4c310af9156d79d3351c16.zip
Merge tag 'audit-pr-20211216' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
Pull audit fix from Paul Moore: "A single patch to fix a problem where the audit queue could grow unbounded when the audit daemon is forcibly stopped" * tag 'audit-pr-20211216' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit: audit: improve robustness of the audit queue handling
-rw-r--r--kernel/audit.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 121d37e700a6..4cebadb5f30d 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -718,7 +718,7 @@ static int kauditd_send_queue(struct sock *sk, u32 portid,
{
int rc = 0;
struct sk_buff *skb;
- static unsigned int failed = 0;
+ unsigned int failed = 0;
/* NOTE: kauditd_thread takes care of all our locking, we just use
* the netlink info passed to us (e.g. sk and portid) */
@@ -735,32 +735,30 @@ static int kauditd_send_queue(struct sock *sk, u32 portid,
continue;
}
+retry:
/* grab an extra skb reference in case of error */
skb_get(skb);
rc = netlink_unicast(sk, skb, portid, 0);
if (rc < 0) {
- /* fatal failure for our queue flush attempt? */
+ /* send failed - try a few times unless fatal error */
if (++failed >= retry_limit ||
rc == -ECONNREFUSED || rc == -EPERM) {
- /* yes - error processing for the queue */
sk = NULL;
if (err_hook)
(*err_hook)(skb);
- if (!skb_hook)
- goto out;
- /* keep processing with the skb_hook */
+ if (rc == -EAGAIN)
+ rc = 0;
+ /* continue to drain the queue */
continue;
} else
- /* no - requeue to preserve ordering */
- skb_queue_head(queue, skb);
+ goto retry;
} else {
- /* it worked - drop the extra reference and continue */
+ /* skb sent - drop the extra reference and continue */
consume_skb(skb);
failed = 0;
}
}
-out:
return (rc >= 0 ? 0 : rc);
}
@@ -1609,7 +1607,8 @@ static int __net_init audit_net_init(struct net *net)
audit_panic("cannot initialize netlink socket in namespace");
return -ENOMEM;
}
- aunet->sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
+ /* limit the timeout in case auditd is blocked/stopped */
+ aunet->sk->sk_sndtimeo = HZ / 10;
return 0;
}