From: Kuniyuki Iwashima <kuniyu@google.com>
To: Martin KaFai Lau <martin.lau@linux.dev>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: John Fastabend <john.fastabend@gmail.com>,
Stanislav Fomichev <sdf@fomichev.me>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
Jiri Olsa <jolsa@kernel.org>, Eric Dumazet <edumazet@google.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
Kuniyuki Iwashima <kuni1840@gmail.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH v2 bpf 6/6] bpf: tcp: Fix type confusion in sol_tcp_sockopt().
Date: Mon, 4 May 2026 21:04:53 +0000 [thread overview]
Message-ID: <20260504210610.180150-7-kuniyu@google.com> (raw)
In-Reply-To: <20260504210610.180150-1-kuniyu@google.com>
sol_tcp_sockopt() only checks if sk->sk_protocol is IPPROTO_TCP,
but RAW socket can bypass it:
socket(AF_INET, SOCK_RAW, IPPROTO_TCP)
Let's use sk_is_tcp().
Note that initially sol_tcp_sockopt() checked sk->sk_prot->setsockopt.
Fixes: 2ab42c7b871f ("bpf: Check the protocol of a sock to agree the calls to bpf_setsockopt().")
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
net/core/filter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index 684922efd481..ef0877eefaa7 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5481,7 +5481,7 @@ static int sol_tcp_sockopt(struct sock *sk, int optname,
char *optval, int *optlen,
bool getopt)
{
- if (sk->sk_protocol != IPPROTO_TCP)
+ if (!sk_is_tcp(sk))
return -EINVAL;
switch (optname) {
--
2.54.0.545.g6539524ca2-goog
prev parent reply other threads:[~2026-05-04 21:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-04 21:04 [PATCH v2 bpf 0/6] bpf: tcp: Fix type confusion in bpf helper functions Kuniyuki Iwashima
2026-05-04 21:04 ` [PATCH v2 bpf 1/6] bpf: tcp: Fix type confusion in bpf_tcp_sock() Kuniyuki Iwashima
2026-05-04 21:50 ` bot+bpf-ci
2026-05-04 21:53 ` Kuniyuki Iwashima
2026-05-04 21:04 ` [PATCH v2 bpf 2/6] selftest: bpf: Add test for bpf_tcp_sock() and RAW socket Kuniyuki Iwashima
2026-05-04 21:04 ` [PATCH v2 bpf 3/6] mptcp: bpf: fix type confusion in bpf_mptcp_sock_from_subflow() Kuniyuki Iwashima
2026-05-04 21:04 ` [PATCH v2 bpf 4/6] bpf: tcp: Fix type confusion in bpf_skc_to_tcp_sock() Kuniyuki Iwashima
2026-05-04 21:04 ` [PATCH v2 bpf 5/6] bpf: tcp: Fix type confusion in bpf_skc_to_tcp6_sock() Kuniyuki Iwashima
2026-05-04 21:04 ` Kuniyuki Iwashima [this message]
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