linux-kernel - Re: [PATCH v5 5/8] io_uring/cmd: return -EOPNOTSUPP if net is disabled

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Date:   Mon, 11 Sep 2023 11:53:58 -0400
From:   Gabriel Krisman Bertazi <krisman@...e.de>
To:     Breno Leitao <leitao@...ian.org>
Cc:     sdf@...gle.com, axboe@...nel.dk, asml.silence@...il.com,
        willemdebruijn.kernel@...il.com, kuba@...nel.org,
        martin.lau@...ux.dev, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        io-uring@...r.kernel.org, pabeni@...hat.com
Subject: Re: [PATCH v5 5/8] io_uring/cmd: return -EOPNOTSUPP if net is disabled

Breno Leitao <leitao@...ian.org> writes:

> Protect io_uring_cmd_sock() to be called if CONFIG_NET is not set. If
> network is not enabled, but io_uring is, then we want to return
> -EOPNOTSUPP for any possible socket operation.
>
> This is helpful because io_uring_cmd_sock() can now call functions that
> only exits if CONFIG_NET is enabled without having #ifdef CONFIG_NET
> inside the function itself.
>
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> ---
>  io_uring/uring_cmd.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
> index 60f843a357e0..a7d6a7d112b7 100644
> --- a/io_uring/uring_cmd.c
> +++ b/io_uring/uring_cmd.c
> @@ -167,6 +167,7 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
>  }
>  EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
>  
> +#if defined(CONFIG_NET)
>  int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
>  {
>  	struct socket *sock = cmd->file->private_data;
> @@ -193,3 +194,10 @@ int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
>  	}
>  }
>  EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
> +#else
> +int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
> +{
> +	return -EOPNOTSUPP;
> +}
> +#endif
> +

Is net/socket.c even built without CONFIG_NET? if not, you don't even need
the alternative EOPNOTSUPP implementation.

-- 
Gabriel Krisman Bertazi