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

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Message-Id: <20230911103407.1393149-6-leitao@debian.org>
Date:   Mon, 11 Sep 2023 03:34:04 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     sdf@...gle.com, axboe@...nel.dk, asml.silence@...il.com,
        willemdebruijn.kernel@...il.com, kuba@...nel.org,
        martin.lau@...ux.dev, krisman@...e.de
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, io-uring@...r.kernel.org, pabeni@...hat.com
Subject: [PATCH v5 5/8] io_uring/cmd: return -EOPNOTSUPP if net is disabled

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
+
-- 
2.34.1