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Date: Tue, 21 Nov 2023 02:01:09 +0000 From: Dmitry Safonov <dima@...sta.com> To: David Ahern <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>, "David S. Miller" <davem@...emloft.net> Cc: linux-kernel@...r.kernel.org, Dmitry Safonov <dima@...sta.com>, Dmitry Safonov <0x7f454c46@...il.com>, Francesco Ruggeri <fruggeri05@...il.com>, Salam Noureddine <noureddine@...sta.com>, Simon Horman <horms@...nel.org>, netdev@...r.kernel.org Subject: [PATCH 5/7] net/tcp: Don't add key with non-matching VRF on connected sockets If the connection was established, don't allow adding TCP-AO keys that don't match the peer. Currently, there are checks for ip-address matching, but L3 index check is missing. Add it to restrict userspace shooting itself somewhere. Fixes: 248411b8cb89 ("net/tcp: Wire up l3index to TCP-AO") Signed-off-by: Dmitry Safonov <dima@...sta.com> --- net/ipv4/tcp_ao.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 71c8c9c59642..122ff58168ee 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -1622,6 +1622,9 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, if (!dev || !l3index) return -EINVAL; + if (!((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))) + return -EINVAL; + /* It's still possible to bind after adding keys or even * re-bind to a different dev (with CAP_NET_RAW). * So, no reason to return error here, rather try to be -- 2.42.0
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