Commit 8a59f9d1e3d4 ("sock: Introduce sk->sk_prot->psock_update_sk_prot()")
has moved the inet_csk_has_ulp(sk) check from sk_psock_init() to
the new tcp_bpf_update_proto() function. I'm guessing that this
was done to allow creating psocks for non-inet sockets.
Unfortunately the destruction path for psock includes the ULP
unwind, so we need to fail the sk_psock_init() itself.
Otherwise if ULP is already present we'll notice that later,
and call tcp_update_ulp() with the sk_proto of the ULP
itself, which will most likely result in the ULP looping
its callbacks.
Fixes: 8a59f9d1e3d4 ("sock: Introduce sk->sk_prot->psock_update_sk_prot()")
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
---
CC: john.fastabend@xxxxxxxxx
CC: jakub@xxxxxxxxxxxxxx
CC: yoshfuji@xxxxxxxxxxxxxx
CC: dsahern@xxxxxxxxxx
CC: ast@xxxxxxxxxx
CC: daniel@xxxxxxxxxxxxx
CC: andrii@xxxxxxxxxx
CC: kafai@xxxxxx
CC: songliubraving@xxxxxx
CC: yhs@xxxxxx
CC: kpsingh@xxxxxxxxxx
CC: borisp@xxxxxxxxxx
CC: cong.wang@xxxxxxxxxxxxx
CC: bpf@xxxxxxxxxxxxxxx
---
include/net/inet_sock.h | 5 +++++
net/core/skmsg.c | 5 +++++
net/ipv4/tcp_bpf.c | 3 ---
net/tls/tls_main.c | 2 ++
4 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index c1b5dcd6597c..daead5fb389a 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -253,6 +253,11 @@ struct inet_sock {
#define IP_CMSG_CHECKSUM BIT(7)
#define IP_CMSG_RECVFRAGSIZE BIT(8)
+static inline bool sk_is_inet(struct sock *sk)
+{
+ return sk->sk_family == AF_INET || sk->sk_family == AF_INET6;
+}
+
/**
* sk_to_full_sk - Access to a full socket
* @sk: pointer to a socket
diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 22b983ade0e7..b0fcd0200e84 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -699,6 +699,11 @@ struct sk_psock *sk_psock_init(struct sock *sk, int node)
write_lock_bh(&sk->sk_callback_lock);
+ if (sk_is_inet(sk) && inet_csk_has_ulp(sk)) {
+ psock = ERR_PTR(-EINVAL);
+ goto out;
+ }
+
if (sk->sk_user_data) {
psock = ERR_PTR(-EBUSY);
goto out;
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index be3947e70fec..0d3f68bb51c0 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -611,9 +611,6 @@ int tcp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore)
return 0;
}
- if (inet_csk_has_ulp(sk))
- return -EINVAL;
-
if (sk->sk_family == AF_INET6) {
if (tcp_bpf_assert_proto_ops(psock->sk_proto))
return -EINVAL;
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index da176411c1b5..2ffede463e4a 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -921,6 +921,8 @@ static void tls_update(struct sock *sk, struct proto *p,
{
struct tls_context *ctx;
+ WARN_ON_ONCE(sk->sk_prot == p);
+
ctx = tls_get_ctx(sk);
if (likely(ctx)) {
ctx->sk_write_space = write_space;
--
2.36.1
