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mptcp: prevent tcp diag from closing listener subflows 

commit 4c0288299fd09ee7c6fbe2f57421f314d8c981db upstream.

The MPTCP protocol does not expect that any other entity could change
the first subflow status when such socket is listening.
Unfortunately the TCP diag interface allows aborting any TCP socket,
including MPTCP listeners subflows. As reported by syzbot, that trigger
a WARN() and could lead to later bigger trouble.

The MPTCP protocol needs to do some MPTCP-level cleanup actions to
properly shutdown the listener. To keep the fix simple, prevent
entirely the diag interface from stopping such listeners.

We could refine the diag callback in a later, larger patch targeting
net-next.

Fixes: 57fc0f1cea ("mptcp: ensure listener is unhashed before updating the sk status")
Cc: stable@vger.kernel.org
Reported-by: <syzbot+5a01c3a666e726bc8752@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/netdev/0000000000004f4579060c68431b@google.com/
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20231226-upstream-net-20231226-mptcp-prevent-warn-v1-2-1404dcc431ea@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Abeni 2023-12-26 13:10:18 +01:00 committed by Greg Kroah-Hartman
parent 105063f7f4
commit af9a530765
1 changed files with 13 additions and 0 deletions
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13
net/mptcp/subflow.c
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@ -1899,6 +1899,17 @@ static void tcp_release_cb_override(struct sock *ssk)
tcp_release_cb(ssk); tcp_release_cb(ssk);
} }
static int tcp_abort_override(struct sock *ssk, int err)
{
/* closing a listener subflow requires a great deal of care.
* keep it simple and just prevent such operation
*/
if (inet_sk_state_load(ssk) == TCP_LISTEN)
return -EINVAL;
return tcp_abort(ssk, err);
}
static struct tcp_ulp_ops subflow_ulp_ops __read_mostly = { static struct tcp_ulp_ops subflow_ulp_ops __read_mostly = {
.name = "mptcp", .name = "mptcp",
.owner = THIS_MODULE, .owner = THIS_MODULE,
@ -1942,6 +1953,7 @@ void __init mptcp_subflow_init(void)
tcp_prot_override = tcp_prot; tcp_prot_override = tcp_prot;
tcp_prot_override.release_cb = tcp_release_cb_override; tcp_prot_override.release_cb = tcp_release_cb_override;
tcp_prot_override.diag_destroy = tcp_abort_override;
#if IS_ENABLED(CONFIG_MPTCP_IPV6) #if IS_ENABLED(CONFIG_MPTCP_IPV6)
/* In struct mptcp_subflow_request_sock, we assume the TCP request sock /* In struct mptcp_subflow_request_sock, we assume the TCP request sock
@ -1977,6 +1989,7 @@ void __init mptcp_subflow_init(void)
tcpv6_prot_override = tcpv6_prot; tcpv6_prot_override = tcpv6_prot;
tcpv6_prot_override.release_cb = tcp_release_cb_override; tcpv6_prot_override.release_cb = tcp_release_cb_override;
tcpv6_prot_override.diag_destroy = tcp_abort_override;
#endif #endif
mptcp_diag_subflow_init(&subflow_ulp_ops); mptcp_diag_subflow_init(&subflow_ulp_ops);