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Message-Id: <20211205192700.25396-1-fw@strlen.de>
Date: Sun, 5 Dec 2021 20:27:00 +0100
From: Florian Westphal <fw@...len.de>
To: <mptcp@...ts.linux.dev>
Cc: syzkaller-bugs@...glegroups.com, <netdev@...r.kernel.org>,
linux-kernel@...r.kernel.org, Florian Westphal <fw@...len.de>,
syzbot+1fd9b69cde42967d1add@...kaller.appspotmail.com
Subject: [PATCH mptcp] mptcp: remove tcp ulp setsockopt support
TCP_ULP setsockopt cannot be used for mptcp because its already
used internally to plumb subflow (tcp) sockets to the mptcp layer.
syzbot managed to trigger a crash for mptcp connections that are
in fallback mode:
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 1 PID: 1083 Comm: syz-executor.3 Not tainted 5.16.0-rc2-syzkaller #0
RIP: 0010:tls_build_proto net/tls/tls_main.c:776 [inline]
[..]
__tcp_set_ulp net/ipv4/tcp_ulp.c:139 [inline]
tcp_set_ulp+0x428/0x4c0 net/ipv4/tcp_ulp.c:160
do_tcp_setsockopt+0x455/0x37c0 net/ipv4/tcp.c:3391
mptcp_setsockopt+0x1b47/0x2400 net/mptcp/sockopt.c:638
Remove support for TCP_ULP setsockopt.
Reported-by: syzbot+1fd9b69cde42967d1add@...kaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@...len.de>
---
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 3c3db22fd36a..aa3fcd86dbe2 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -543,7 +543,6 @@ static bool mptcp_supported_sockopt(int level, int optname)
case TCP_NODELAY:
case TCP_THIN_LINEAR_TIMEOUTS:
case TCP_CONGESTION:
- case TCP_ULP:
case TCP_CORK:
case TCP_KEEPIDLE:
case TCP_KEEPINTVL:
--
2.32.0
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