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tcp/dccp: fix lockdep issue when SYN is backlogged 

[ Upstream commit 1ad98e9d1b ]

In normal SYN processing, packets are handled without listener
lock and in RCU protected ingress path.

But syzkaller is known to be able to trick us and SYN
packets might be processed in process context, after being
queued into socket backlog.

In commit 06f877d613 ("tcp/dccp: fix other lockdep splats
accessing ireq_opt") I made a very stupid fix, that happened
to work mostly because of the regular path being RCU protected.

Really the thing protecting ireq->ireq_opt is RCU read lock,
and the pseudo request refcnt is not relevant.

This patch extends what I did in commit 449809a66c ("tcp/dccp:
block BH for SYN processing") by adding an extra rcu_read_{lock|unlock}
pair in the paths that might be taken when processing SYN from
socket backlog (thus possibly in process context)

Fixes: 06f877d613 ("tcp/dccp: fix other lockdep splats accessing ireq_opt")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Eric Dumazet 2018-10-01 15:02:26 -07:00 committed by Greg Kroah-Hartman
parent 4b7b26024f
commit 17af5475ae
3 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/inet_sock.h
View File

@ -131,8 +131,7 @@ static inline int inet_request_bound_dev_if(const struct sock *sk,
static inline struct ip_options_rcu *ireq_opt_deref(const struct inet_request_sock *ireq)
{
return rcu_dereference_check(ireq->ireq_opt,
refcount_read(&ireq->req.rsk_refcnt) > 0);
return rcu_dereference(ireq->ireq_opt);
}
struct inet_cork {

4
net/dccp/input.c
View File

@ -605,11 +605,13 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
if (sk->sk_state == DCCP_LISTEN) {
if (dh->dccph_type == DCCP_PKT_REQUEST) {
/* It is possible that we process SYN packets from backlog,
* so we need to make sure to disable BH right there.
* so we need to make sure to disable BH and RCU right there.
*/
rcu_read_lock();
local_bh_disable();
acceptable = inet_csk(sk)->icsk_af_ops->conn_request(sk, skb) >= 0;
local_bh_enable();
rcu_read_unlock();
if (!acceptable)
return 1;
consume_skb(skb);

4
net/ipv4/tcp_input.c
View File

@ -5913,11 +5913,13 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
if (th->fin)
goto discard;
/* It is possible that we process SYN packets from backlog,
* so we need to make sure to disable BH right there.
* so we need to make sure to disable BH and RCU right there.
*/
rcu_read_lock();
local_bh_disable();
acceptable = icsk->icsk_af_ops->conn_request(sk, skb) >= 0;
local_bh_enable();
rcu_read_unlock();
if (!acceptable)
return 1;