linux-kernel - [PATCH bpf 1/1] net: bpf: don't leak time wait and request sockets

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Message-Id: <20200109115749.12283-2-lmb@cloudflare.com>
Date:   Thu,  9 Jan 2020 11:57:48 +0000
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Lorenz Bauer <lmb@...udflare.com>,
        Martin KaFai Lau <kafai@...com>,
        Joe Stringer <joe@...valent.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kernel-team@...udflare.com, edumazet@...gle.com
Subject: [PATCH bpf 1/1] net: bpf: don't leak time wait and request sockets

It's possible to leak time wait and request sockets via the following
BPF pseudo code:
 
  sk = bpf_skc_lookup_tcp(...)
  if (sk)
    bpf_sk_release(sk)

If sk->sk_state is TCP_NEW_SYN_RECV or TCP_TIME_WAIT the refcount taken
by bpf_skc_lookup_tcp is not undone by bpf_sk_release. This is because
sk_flags is re-used for other data in both kinds of sockets. The check

  !sock_flag(sk, SOCK_RCU_FREE)

therefore returns a bogus result.

Introduce a helper to account for this complication, and call it from
the necessary places.

Fixes: edbf8c01de5a ("bpf: add skc_lookup_tcp helper")
Fixes: f7355a6c0497 ("bpf: Check sk_fullsock() before returning from bpf_sk_lookup()")
Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
---
 net/core/filter.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 42fd17c48c5f..d98dc4526d82 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5266,6 +5266,14 @@ __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
 	return sk;
 }
 
+static void __bpf_sk_release(struct sock *sk)
+{
+	/* time wait and request socks don't have sk_flags. */
+	if (sk->sk_state == TCP_TIME_WAIT || sk->sk_state == TCP_NEW_SYN_RECV ||
+	    !sock_flag(sk, SOCK_RCU_FREE))
+		sock_gen_put(sk);
+}
+
 static struct sock *
 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
 		struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
@@ -5277,8 +5285,7 @@ __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
 	if (sk) {
 		sk = sk_to_full_sk(sk);
 		if (!sk_fullsock(sk)) {
-			if (!sock_flag(sk, SOCK_RCU_FREE))
-				sock_gen_put(sk);
+			__bpf_sk_release(sk);
 			return NULL;
 		}
 	}
@@ -5315,8 +5322,7 @@ bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
 	if (sk) {
 		sk = sk_to_full_sk(sk);
 		if (!sk_fullsock(sk)) {
-			if (!sock_flag(sk, SOCK_RCU_FREE))
-				sock_gen_put(sk);
+			__bpf_sk_release(sk);
 			return NULL;
 		}
 	}
@@ -5383,8 +5389,7 @@ static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
 
 BPF_CALL_1(bpf_sk_release, struct sock *, sk)
 {
-	if (!sock_flag(sk, SOCK_RCU_FREE))
-		sock_gen_put(sk);
+	__bpf_sk_release(sk);
 	return 0;
 }
 
-- 
2.20.1