linux-kernel - Re: [PATCH v3 5/7] net/tcp: Don't add key with non-matching VRF on connected sockets

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Date:   Tue, 28 Nov 2023 18:34:51 -0700
From:   David Ahern <dsahern@...nel.org>
To:     Dmitry Safonov <dima@...sta.com>,
        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 <0x7f454c46@...il.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        Simon Horman <horms@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH v3 5/7] net/tcp: Don't add key with non-matching VRF on
 connected sockets

On 11/28/23 1:57 PM, Dmitry Safonov wrote:
> 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

you say L3 index check is missing - add it. yet ...

> 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 bf41be6d4721..2d000e275ce7 100644
> --- a/net/ipv4/tcp_ao.c
> +++ b/net/ipv4/tcp_ao.c
> @@ -1608,6 +1608,9 @@ 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;

... this is checking socket state.


> +
>  		/* 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