netdev - [bpf-next PATCH v2 1/6] bpf, sockmap: skb verdict SK_PASS to self already checked rmem limits

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <160226625788.4390.13364451138430478477.stgit@john-Precision-5820-Tower>
Date:   Fri, 09 Oct 2020 10:57:38 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     john.fastabend@...il.com, alexei.starovoitov@...il.com,
        daniel@...earbox.net
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, jakub@...udflare.com,
        lmb@...udflare.com
Subject: [bpf-next PATCH v2 1/6] bpf,
 sockmap: skb verdict SK_PASS to self already checked rmem limits

For sk_skb case where skb_verdict program returns SK_PASS to continue to
pass packet up the stack, the memory limits were already checked before
enqueuing in skb_queue_tail from TCP side. So, lets remove the extra checks
here. The theory is if the TCP stack believes we have memory to receive
the packet then lets trust the stack and not double check the limits.

In fact the accounting here can cause a drop if sk_rmem_alloc has increased
after the stack accepted this packet, but before the duplicate check here.
And worse if this happens because TCP stack already believes the data has
been received there is no retransmit.

Fixes: 51199405f9672 ("bpf: skb_verdict, support SK_PASS on RX BPF path")
Signed-off-by: John Fastabend <john.fastabend@...il.com>
---
 net/core/skmsg.c |   15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 4b5f7c8fecd1..040ae1d75b65 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -771,6 +771,7 @@ EXPORT_SYMBOL_GPL(sk_psock_tls_strp_read);
 static void sk_psock_verdict_apply(struct sk_psock *psock,
 				   struct sk_buff *skb, int verdict)
 {
+	struct tcp_skb_cb *tcp;
 	struct sock *sk_other;
 
 	switch (verdict) {
@@ -780,16 +781,12 @@ static void sk_psock_verdict_apply(struct sk_psock *psock,
 		    !sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) {
 			goto out_free;
 		}
-		if (atomic_read(&sk_other->sk_rmem_alloc) <=
-		    sk_other->sk_rcvbuf) {
-			struct tcp_skb_cb *tcp = TCP_SKB_CB(skb);
 
-			tcp->bpf.flags |= BPF_F_INGRESS;
-			skb_queue_tail(&psock->ingress_skb, skb);
-			schedule_work(&psock->work);
-			break;
-		}
-		goto out_free;
+		tcp = TCP_SKB_CB(skb);
+		tcp->bpf.flags |= BPF_F_INGRESS;
+		skb_queue_tail(&psock->ingress_skb, skb);
+		schedule_work(&psock->work);
+		break;
 	case __SK_REDIRECT:
 		sk_psock_skb_redirect(skb);
 		break;