linux-kernel - [PATCH 1/3] vsock: Add support for SIOCINQ ioctl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250519070649.3063874-2-niuxuewei.nxw@antgroup.com>
Date: Mon, 19 May 2025 15:06:47 +0800
From: Xuewei Niu <niuxuewei97@...il.com>
To: sgarzare@...hat.com,
	mst@...hat.com,
	fupan.lfp@...group.com,
	pabeni@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	davem@...emloft.net,
	stefanha@...hat.com
Cc: virtualization@...ts.linux.dev,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Xuewei Niu <niuxuewei.nxw@...group.com>
Subject: [PATCH 1/3] vsock: Add support for SIOCINQ ioctl

This patch adds support for SIOCINQ ioctl, which returns the number of
bytes unread in the socket.

Signed-off-by: Xuewei Niu <niuxuewei.nxw@...group.com>
---
 include/net/af_vsock.h   |  2 ++
 net/vmw_vsock/af_vsock.c | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 9e85424c8343..6f32a2601a49 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -171,6 +171,8 @@ struct vsock_transport {
 
 	/* SIOCOUTQ ioctl */
 	ssize_t (*unsent_bytes)(struct vsock_sock *vsk);
+	/* SIOCINQ ioctl */
+	ssize_t (*unread_bytes)(struct vsock_sock *vsk);
 
 	/* Shutdown. */
 	int (*shutdown)(struct vsock_sock *, int);
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index fc6afbc8d680..288bbfd43bc5 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1356,6 +1356,28 @@ static int vsock_do_ioctl(struct socket *sock, unsigned int cmd,
 	vsk = vsock_sk(sk);
 
 	switch (cmd) {
+	case SIOCINQ: {
+		ssize_t n_bytes;
+
+		if (!vsk->transport || !vsk->transport->unread_bytes) {
+			ret = -EOPNOTSUPP;
+			break;
+		}
+
+		if (sock_type_connectible(sk->sk_type) &&
+		    sk->sk_state == TCP_LISTEN) {
+			ret = -EINVAL;
+			break;
+		}
+
+		n_bytes = vsk->transport->unread_bytes(vsk);
+		if (n_bytes < 0) {
+			ret = n_bytes;
+			break;
+		}
+		ret = put_user(n_bytes, arg);
+		break;
+	}
 	case SIOCOUTQ: {
 		ssize_t n_bytes;
 
-- 
2.34.1