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Message-Id: <20200125000403.251894-2-mathew.j.martineau@linux.intel.com>
Date: Fri, 24 Jan 2020 16:04:02 -0800
From: Mat Martineau <mathew.j.martineau@...ux.intel.com>
To: netdev@...r.kernel.org
Cc: Florian Westphal <fw@...len.de>, mptcp@...ts.01.org,
edumazet@...gle.com, Christoph Paasch <cpaasch@...le.com>,
Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 1/2] mptcp: do not inherit inet proto ops
From: Florian Westphal <fw@...len.de>
We need to initialise the struct ourselves, else we expose tcp-specific
callbacks such as tcp_splice_read which will then trigger splat because
the socket is an mptcp one:
BUG: KASAN: slab-out-of-bounds in tcp_mstamp_refresh+0x80/0xa0 net/ipv4/tcp_output.c:57
Write of size 8 at addr ffff888116aa21d0 by task syz-executor.0/5478
CPU: 1 PID: 5478 Comm: syz-executor.0 Not tainted 5.5.0-rc6 #3
Call Trace:
tcp_mstamp_refresh+0x80/0xa0 net/ipv4/tcp_output.c:57
tcp_rcv_space_adjust+0x72/0x7f0 net/ipv4/tcp_input.c:612
tcp_read_sock+0x622/0x990 net/ipv4/tcp.c:1674
tcp_splice_read+0x20b/0xb40 net/ipv4/tcp.c:791
do_splice+0x1259/0x1560 fs/splice.c:1205
To prevent build error with ipv6, add the recv/sendmsg function
declaration to ipv6.h. The functions are already accessible "thanks"
to retpoline related work, but they are currently only made visible
by socket.c specific INDIRECT_CALLABLE macros.
Reported-by: Christoph Paasch <cpaasch@...le.com>
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
include/net/ipv6.h | 3 ++
net/mptcp/protocol.c | 70 ++++++++++++++++++++++++++++++++------------
2 files changed, 54 insertions(+), 19 deletions(-)
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 4e95f6df508c..cec1a54401f2 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1113,6 +1113,9 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
int inet6_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk);
+int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
+int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
+ int flags);
/*
* reassembly.c
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index ee916b3686fe..41d49126d29a 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1163,7 +1163,31 @@ static int mptcp_shutdown(struct socket *sock, int how)
return ret;
}
-static struct proto_ops mptcp_stream_ops;
+static const struct proto_ops mptcp_stream_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = inet_release,
+ .bind = mptcp_bind,
+ .connect = mptcp_stream_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = mptcp_stream_accept,
+ .getname = mptcp_v4_getname,
+ .poll = mptcp_poll,
+ .ioctl = inet_ioctl,
+ .gettstamp = sock_gettstamp,
+ .listen = mptcp_listen,
+ .shutdown = mptcp_shutdown,
+ .setsockopt = sock_common_setsockopt,
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = inet_sendmsg,
+ .recvmsg = inet_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = inet_sendpage,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
static struct inet_protosw mptcp_protosw = {
.type = SOCK_STREAM,
@@ -1176,14 +1200,6 @@ static struct inet_protosw mptcp_protosw = {
void mptcp_proto_init(void)
{
mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo;
- mptcp_stream_ops = inet_stream_ops;
- mptcp_stream_ops.bind = mptcp_bind;
- mptcp_stream_ops.connect = mptcp_stream_connect;
- mptcp_stream_ops.poll = mptcp_poll;
- mptcp_stream_ops.accept = mptcp_stream_accept;
- mptcp_stream_ops.getname = mptcp_v4_getname;
- mptcp_stream_ops.listen = mptcp_listen;
- mptcp_stream_ops.shutdown = mptcp_shutdown;
mptcp_subflow_init();
@@ -1194,7 +1210,32 @@ void mptcp_proto_init(void)
}
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
-static struct proto_ops mptcp_v6_stream_ops;
+static const struct proto_ops mptcp_v6_stream_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = inet6_release,
+ .bind = mptcp_bind,
+ .connect = mptcp_stream_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = mptcp_stream_accept,
+ .getname = mptcp_v6_getname,
+ .poll = mptcp_poll,
+ .ioctl = inet6_ioctl,
+ .gettstamp = sock_gettstamp,
+ .listen = mptcp_listen,
+ .shutdown = mptcp_shutdown,
+ .setsockopt = sock_common_setsockopt,
+ .getsockopt = sock_common_getsockopt,
+ .sendmsg = inet6_sendmsg,
+ .recvmsg = inet6_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = inet_sendpage,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
static struct proto mptcp_v6_prot;
static void mptcp_v6_destroy(struct sock *sk)
@@ -1226,15 +1267,6 @@ int mptcp_proto_v6_init(void)
if (err)
return err;
- mptcp_v6_stream_ops = inet6_stream_ops;
- mptcp_v6_stream_ops.bind = mptcp_bind;
- mptcp_v6_stream_ops.connect = mptcp_stream_connect;
- mptcp_v6_stream_ops.poll = mptcp_poll;
- mptcp_v6_stream_ops.accept = mptcp_stream_accept;
- mptcp_v6_stream_ops.getname = mptcp_v6_getname;
- mptcp_v6_stream_ops.listen = mptcp_listen;
- mptcp_v6_stream_ops.shutdown = mptcp_shutdown;
-
err = inet6_register_protosw(&mptcp_v6_protosw);
if (err)
proto_unregister(&mptcp_v6_prot);
--
2.25.0
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