Subject: [PATCH 46/48] socket, bpf: fix possible use after free

From: Eric Dumazet <[email-masked]>
Date: Mon, 2 Oct 2017 12:20:51 -0700

[ Upstream commit eefca20eb20c66b06cf5ed09b49b1a7caaa27b7b ]

Starting from linux-4.4, 3WHS no longer takes the listener lock.

Since this time, we might hit a use-after-free in sk_filter_charge(),
if the filter we got in the memcpy() of the listener content
just happened to be replaced by a thread changing listener BPF filter.

To fix this, we need to make sure the filter refcount is not already
zero before incrementing it again.

Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets")
Signed-off-by: Eric Dumazet <[email-masked]>
Acked-by: Alexei Starovoitov <[email-masked]>
Acked-by: Daniel Borkmann <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/core/filter.c | 12 ++++++++----
 net/core/sock.c   |  5 ++++-
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 169974998c76..18d591f1ae5a 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -975,10 +975,14 @@ static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
 
 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
 {
-	bool ret = __sk_filter_charge(sk, fp);
-	if (ret)
-		refcount_inc(&fp->refcnt);
-	return ret;
+	if (!refcount_inc_not_zero(&fp->refcnt))
+		return false;
+
+	if (!__sk_filter_charge(sk, fp)) {
+		sk_filter_release(fp);
+		return false;
+	}
+	return true;
 }
 
 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
diff --git a/net/core/sock.c b/net/core/sock.c
index b22228901a11..0967da925022 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1675,13 +1675,16 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 
 		sock_reset_flag(newsk, SOCK_DONE);
 
-		filter = rcu_dereference_protected(newsk->sk_filter, 1);
+		rcu_read_lock();
+		filter = rcu_dereference(sk->sk_filter);
 		if (filter != NULL)
 			/* though it's an empty new sock, the charging may fail
 			 * if sysctl_optmem_max was changed between creation of
 			 * original socket and cloning
 			 */
 			is_charged = sk_filter_charge(newsk, filter);
+		RCU_INIT_POINTER(newsk->sk_filter, filter);
+		rcu_read_unlock();
 
 		if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
 			/* We need to make sure that we don't uncharge the new
-- 
2.13.6