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![Ying Xue](/assets/img/avatar_default.png)
When creation of TIPC internal server socket fails,
we get an oops with the following dump:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: [<ffffffffa0011f49>] tipc_close_conn+0x59/0xb0 [tipc]
PGD 13719067 PUD 12008067 PMD 0
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
Modules linked in: tipc(+)
CPU: 4 PID: 4340 Comm: insmod Not tainted 3.10.0+ #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
task: ffff880014360000 ti: ffff88001374c000 task.ti: ffff88001374c000
RIP: 0010:[<ffffffffa0011f49>] [<ffffffffa0011f49>] tipc_close_conn+0x59/0xb0 [tipc]
RSP: 0018:ffff88001374dc98 EFLAGS: 00010292
RAX: 0000000000000000 RBX: ffff880012ac09d8 RCX: 0000000000000000
RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffff880014360000
RBP: ffff88001374dcb8 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa0016fa0
R13: ffffffffa0017010 R14: ffffffffa0017010 R15: ffff880012ac09d8
FS: 0000000000000000(0000) GS:ffff880016600000(0063) knlGS:00000000f76668d0
CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b
CR2: 0000000000000020 CR3: 0000000012227000 CR4: 00000000000006e0
Stack:
ffff88001374dcb8 ffffffffa0016fa0 0000000000000000 0000000000000001
ffff88001374dcf8 ffffffffa0012922 ffff88001374dce8 00000000ffffffea
ffffffffa0017100 0000000000000000 ffff8800134241a8 ffffffffa0017150
Call Trace:
[<ffffffffa0012922>] tipc_server_stop+0xa2/0x1b0 [tipc]
[<ffffffffa0009995>] tipc_subscr_stop+0x15/0x20 [tipc]
[<ffffffffa00130f5>] tipc_core_stop+0x1d/0x33 [tipc]
[<ffffffffa001f0d4>] tipc_init+0xd4/0xf8 [tipc]
[<ffffffffa001f000>] ? 0xffffffffa001efff
[<ffffffff8100023f>] do_one_initcall+0x3f/0x150
[<ffffffff81082f4d>] ? __blocking_notifier_call_chain+0x7d/0xd0
[<ffffffff810cc58a>] load_module+0x11aa/0x19c0
[<ffffffff810c8d60>] ? show_initstate+0x50/0x50
[<ffffffff8190311c>] ? retint_restore_args+0xe/0xe
[<ffffffff810cce79>] SyS_init_module+0xd9/0x110
[<ffffffff8190dc65>] sysenter_dispatch+0x7/0x1f
Code: 6c 24 70 4c 89 ef e8 b7 04 8f e1 8b 73 04 4c 89 e7 e8 7c 9e 32 e1 41 83 ac 24
b8 00 00 00 01 4c 89 ef e8 eb 0a 8f e1 48 8b 43 08 <4c> 8b 68 20 4d 8d a5 48 03 00
00 4c 89 e7 e8 04 05 8f e1 4c 89
RIP [<ffffffffa0011f49>] tipc_close_conn+0x59/0xb0 [tipc]
RSP <ffff88001374dc98>
CR2: 0000000000000020
---[ end trace b02321f40e4269a3 ]---
We have the following call chain:
tipc_core_start()
ret = tipc_subscr_start()
ret = tipc_server_start(){
server->enabled = 1;
ret = tipc_open_listening_sock()
}
I.e., the server->enabled flag is unconditionally set to 1, whatever
the return value of tipc_open_listening_sock().
This causes a crash when tipc_core_start() tries to clean up
resources after a failed initialization:
if (ret == failed)
tipc_subscr_stop()
tipc_server_stop(){
if (server->enabled)
tipc_close_conn(){
NULL reference of con->sock-sk
OOPS!
}
}
To avoid this, tipc_server_start() should only set server->enabled
to 1 in case of a succesful socket creation. In case of failure, it
should release all allocated resources before returning.
Problem introduced in commit c5fa7b3cf3
("tipc: introduce new TIPC server infrastructure") in v3.11-rc1.
Note that it won't be seen often; it takes a module load under memory
constrained conditions in order to trigger the failure condition.
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
605 lines
14 KiB
C
605 lines
14 KiB
C
/*
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* net/tipc/server.c: TIPC server infrastructure
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*
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* Copyright (c) 2012-2013, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "server.h"
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#include "core.h"
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#include <net/sock.h>
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/* Number of messages to send before rescheduling */
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#define MAX_SEND_MSG_COUNT 25
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#define MAX_RECV_MSG_COUNT 25
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#define CF_CONNECTED 1
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#define sock2con(x) ((struct tipc_conn *)(x)->sk_user_data)
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/**
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* struct tipc_conn - TIPC connection structure
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* @kref: reference counter to connection object
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* @conid: connection identifier
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* @sock: socket handler associated with connection
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* @flags: indicates connection state
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* @server: pointer to connected server
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* @rwork: receive work item
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* @usr_data: user-specified field
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* @rx_action: what to do when connection socket is active
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* @outqueue: pointer to first outbound message in queue
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* @outqueue_lock: controll access to the outqueue
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* @outqueue: list of connection objects for its server
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* @swork: send work item
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*/
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struct tipc_conn {
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struct kref kref;
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int conid;
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struct socket *sock;
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unsigned long flags;
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struct tipc_server *server;
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struct work_struct rwork;
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int (*rx_action) (struct tipc_conn *con);
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void *usr_data;
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struct list_head outqueue;
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spinlock_t outqueue_lock;
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struct work_struct swork;
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};
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/* An entry waiting to be sent */
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struct outqueue_entry {
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struct list_head list;
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struct kvec iov;
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struct sockaddr_tipc dest;
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};
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static void tipc_recv_work(struct work_struct *work);
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static void tipc_send_work(struct work_struct *work);
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static void tipc_clean_outqueues(struct tipc_conn *con);
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static void tipc_conn_kref_release(struct kref *kref)
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{
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struct tipc_conn *con = container_of(kref, struct tipc_conn, kref);
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struct tipc_server *s = con->server;
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if (con->sock) {
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tipc_sock_release_local(con->sock);
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con->sock = NULL;
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}
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tipc_clean_outqueues(con);
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if (con->conid)
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s->tipc_conn_shutdown(con->conid, con->usr_data);
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kfree(con);
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}
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static void conn_put(struct tipc_conn *con)
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{
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kref_put(&con->kref, tipc_conn_kref_release);
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}
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static void conn_get(struct tipc_conn *con)
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{
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kref_get(&con->kref);
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}
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static struct tipc_conn *tipc_conn_lookup(struct tipc_server *s, int conid)
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{
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struct tipc_conn *con;
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spin_lock_bh(&s->idr_lock);
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con = idr_find(&s->conn_idr, conid);
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if (con)
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conn_get(con);
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spin_unlock_bh(&s->idr_lock);
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return con;
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}
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static void sock_data_ready(struct sock *sk, int unused)
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{
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struct tipc_conn *con;
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read_lock(&sk->sk_callback_lock);
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con = sock2con(sk);
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if (con && test_bit(CF_CONNECTED, &con->flags)) {
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conn_get(con);
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if (!queue_work(con->server->rcv_wq, &con->rwork))
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conn_put(con);
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}
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read_unlock(&sk->sk_callback_lock);
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}
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static void sock_write_space(struct sock *sk)
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{
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struct tipc_conn *con;
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read_lock(&sk->sk_callback_lock);
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con = sock2con(sk);
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if (con && test_bit(CF_CONNECTED, &con->flags)) {
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conn_get(con);
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if (!queue_work(con->server->send_wq, &con->swork))
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conn_put(con);
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}
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read_unlock(&sk->sk_callback_lock);
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}
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static void tipc_register_callbacks(struct socket *sock, struct tipc_conn *con)
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{
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struct sock *sk = sock->sk;
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write_lock_bh(&sk->sk_callback_lock);
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sk->sk_data_ready = sock_data_ready;
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sk->sk_write_space = sock_write_space;
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sk->sk_user_data = con;
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con->sock = sock;
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write_unlock_bh(&sk->sk_callback_lock);
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}
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static void tipc_unregister_callbacks(struct tipc_conn *con)
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{
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struct sock *sk = con->sock->sk;
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write_lock_bh(&sk->sk_callback_lock);
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sk->sk_user_data = NULL;
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write_unlock_bh(&sk->sk_callback_lock);
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}
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static void tipc_close_conn(struct tipc_conn *con)
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{
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struct tipc_server *s = con->server;
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if (test_and_clear_bit(CF_CONNECTED, &con->flags)) {
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spin_lock_bh(&s->idr_lock);
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idr_remove(&s->conn_idr, con->conid);
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s->idr_in_use--;
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spin_unlock_bh(&s->idr_lock);
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tipc_unregister_callbacks(con);
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/* We shouldn't flush pending works as we may be in the
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* thread. In fact the races with pending rx/tx work structs
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* are harmless for us here as we have already deleted this
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* connection from server connection list and set
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* sk->sk_user_data to 0 before releasing connection object.
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*/
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kernel_sock_shutdown(con->sock, SHUT_RDWR);
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conn_put(con);
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}
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}
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static struct tipc_conn *tipc_alloc_conn(struct tipc_server *s)
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{
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struct tipc_conn *con;
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int ret;
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con = kzalloc(sizeof(struct tipc_conn), GFP_ATOMIC);
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if (!con)
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return ERR_PTR(-ENOMEM);
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kref_init(&con->kref);
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INIT_LIST_HEAD(&con->outqueue);
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spin_lock_init(&con->outqueue_lock);
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INIT_WORK(&con->swork, tipc_send_work);
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INIT_WORK(&con->rwork, tipc_recv_work);
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spin_lock_bh(&s->idr_lock);
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ret = idr_alloc(&s->conn_idr, con, 0, 0, GFP_ATOMIC);
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if (ret < 0) {
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kfree(con);
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spin_unlock_bh(&s->idr_lock);
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return ERR_PTR(-ENOMEM);
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}
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con->conid = ret;
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s->idr_in_use++;
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spin_unlock_bh(&s->idr_lock);
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set_bit(CF_CONNECTED, &con->flags);
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con->server = s;
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return con;
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}
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static int tipc_receive_from_sock(struct tipc_conn *con)
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{
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struct msghdr msg = {};
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struct tipc_server *s = con->server;
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struct sockaddr_tipc addr;
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struct kvec iov;
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void *buf;
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int ret;
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buf = kmem_cache_alloc(s->rcvbuf_cache, GFP_ATOMIC);
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if (!buf) {
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ret = -ENOMEM;
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goto out_close;
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}
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iov.iov_base = buf;
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iov.iov_len = s->max_rcvbuf_size;
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msg.msg_name = &addr;
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ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len,
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MSG_DONTWAIT);
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if (ret <= 0) {
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kmem_cache_free(s->rcvbuf_cache, buf);
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goto out_close;
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}
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s->tipc_conn_recvmsg(con->conid, &addr, con->usr_data, buf, ret);
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kmem_cache_free(s->rcvbuf_cache, buf);
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return 0;
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out_close:
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if (ret != -EWOULDBLOCK)
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tipc_close_conn(con);
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else if (ret == 0)
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/* Don't return success if we really got EOF */
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ret = -EAGAIN;
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return ret;
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}
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static int tipc_accept_from_sock(struct tipc_conn *con)
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{
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struct tipc_server *s = con->server;
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struct socket *sock = con->sock;
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struct socket *newsock;
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struct tipc_conn *newcon;
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int ret;
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ret = tipc_sock_accept_local(sock, &newsock, O_NONBLOCK);
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if (ret < 0)
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return ret;
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newcon = tipc_alloc_conn(con->server);
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if (IS_ERR(newcon)) {
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ret = PTR_ERR(newcon);
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sock_release(newsock);
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return ret;
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}
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newcon->rx_action = tipc_receive_from_sock;
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tipc_register_callbacks(newsock, newcon);
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/* Notify that new connection is incoming */
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newcon->usr_data = s->tipc_conn_new(newcon->conid);
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/* Wake up receive process in case of 'SYN+' message */
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newsock->sk->sk_data_ready(newsock->sk, 0);
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return ret;
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}
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static struct socket *tipc_create_listen_sock(struct tipc_conn *con)
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{
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struct tipc_server *s = con->server;
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struct socket *sock = NULL;
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int ret;
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ret = tipc_sock_create_local(s->type, &sock);
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if (ret < 0)
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return NULL;
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ret = kernel_setsockopt(sock, SOL_TIPC, TIPC_IMPORTANCE,
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(char *)&s->imp, sizeof(s->imp));
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if (ret < 0)
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goto create_err;
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ret = kernel_bind(sock, (struct sockaddr *)s->saddr, sizeof(*s->saddr));
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if (ret < 0)
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goto create_err;
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switch (s->type) {
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case SOCK_STREAM:
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case SOCK_SEQPACKET:
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con->rx_action = tipc_accept_from_sock;
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ret = kernel_listen(sock, 0);
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if (ret < 0)
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goto create_err;
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break;
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case SOCK_DGRAM:
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case SOCK_RDM:
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con->rx_action = tipc_receive_from_sock;
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break;
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default:
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pr_err("Unknown socket type %d\n", s->type);
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goto create_err;
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}
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return sock;
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create_err:
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sock_release(sock);
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con->sock = NULL;
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return NULL;
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}
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static int tipc_open_listening_sock(struct tipc_server *s)
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{
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struct socket *sock;
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struct tipc_conn *con;
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con = tipc_alloc_conn(s);
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if (IS_ERR(con))
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return PTR_ERR(con);
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sock = tipc_create_listen_sock(con);
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if (!sock) {
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idr_remove(&s->conn_idr, con->conid);
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s->idr_in_use--;
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kfree(con);
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return -EINVAL;
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}
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tipc_register_callbacks(sock, con);
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return 0;
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}
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static struct outqueue_entry *tipc_alloc_entry(void *data, int len)
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{
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struct outqueue_entry *entry;
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void *buf;
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entry = kmalloc(sizeof(struct outqueue_entry), GFP_ATOMIC);
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if (!entry)
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return NULL;
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buf = kmalloc(len, GFP_ATOMIC);
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if (!buf) {
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kfree(entry);
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return NULL;
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}
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memcpy(buf, data, len);
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entry->iov.iov_base = buf;
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entry->iov.iov_len = len;
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return entry;
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}
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static void tipc_free_entry(struct outqueue_entry *e)
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{
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kfree(e->iov.iov_base);
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kfree(e);
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}
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static void tipc_clean_outqueues(struct tipc_conn *con)
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{
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struct outqueue_entry *e, *safe;
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spin_lock_bh(&con->outqueue_lock);
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list_for_each_entry_safe(e, safe, &con->outqueue, list) {
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list_del(&e->list);
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tipc_free_entry(e);
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}
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spin_unlock_bh(&con->outqueue_lock);
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}
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int tipc_conn_sendmsg(struct tipc_server *s, int conid,
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struct sockaddr_tipc *addr, void *data, size_t len)
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{
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struct outqueue_entry *e;
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struct tipc_conn *con;
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con = tipc_conn_lookup(s, conid);
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if (!con)
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return -EINVAL;
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e = tipc_alloc_entry(data, len);
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if (!e) {
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conn_put(con);
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return -ENOMEM;
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}
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if (addr)
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memcpy(&e->dest, addr, sizeof(struct sockaddr_tipc));
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spin_lock_bh(&con->outqueue_lock);
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list_add_tail(&e->list, &con->outqueue);
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spin_unlock_bh(&con->outqueue_lock);
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if (test_bit(CF_CONNECTED, &con->flags))
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if (!queue_work(s->send_wq, &con->swork))
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conn_put(con);
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return 0;
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}
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void tipc_conn_terminate(struct tipc_server *s, int conid)
|
|
{
|
|
struct tipc_conn *con;
|
|
|
|
con = tipc_conn_lookup(s, conid);
|
|
if (con) {
|
|
tipc_close_conn(con);
|
|
conn_put(con);
|
|
}
|
|
}
|
|
|
|
static void tipc_send_to_sock(struct tipc_conn *con)
|
|
{
|
|
int count = 0;
|
|
struct tipc_server *s = con->server;
|
|
struct outqueue_entry *e;
|
|
struct msghdr msg;
|
|
int ret;
|
|
|
|
spin_lock_bh(&con->outqueue_lock);
|
|
while (1) {
|
|
e = list_entry(con->outqueue.next, struct outqueue_entry,
|
|
list);
|
|
if ((struct list_head *) e == &con->outqueue)
|
|
break;
|
|
spin_unlock_bh(&con->outqueue_lock);
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.msg_flags = MSG_DONTWAIT;
|
|
|
|
if (s->type == SOCK_DGRAM || s->type == SOCK_RDM) {
|
|
msg.msg_name = &e->dest;
|
|
msg.msg_namelen = sizeof(struct sockaddr_tipc);
|
|
}
|
|
ret = kernel_sendmsg(con->sock, &msg, &e->iov, 1,
|
|
e->iov.iov_len);
|
|
if (ret == -EWOULDBLOCK || ret == 0) {
|
|
cond_resched();
|
|
goto out;
|
|
} else if (ret < 0) {
|
|
goto send_err;
|
|
}
|
|
|
|
/* Don't starve users filling buffers */
|
|
if (++count >= MAX_SEND_MSG_COUNT) {
|
|
cond_resched();
|
|
count = 0;
|
|
}
|
|
|
|
spin_lock_bh(&con->outqueue_lock);
|
|
list_del(&e->list);
|
|
tipc_free_entry(e);
|
|
}
|
|
spin_unlock_bh(&con->outqueue_lock);
|
|
out:
|
|
return;
|
|
|
|
send_err:
|
|
tipc_close_conn(con);
|
|
}
|
|
|
|
static void tipc_recv_work(struct work_struct *work)
|
|
{
|
|
struct tipc_conn *con = container_of(work, struct tipc_conn, rwork);
|
|
int count = 0;
|
|
|
|
while (test_bit(CF_CONNECTED, &con->flags)) {
|
|
if (con->rx_action(con))
|
|
break;
|
|
|
|
/* Don't flood Rx machine */
|
|
if (++count >= MAX_RECV_MSG_COUNT) {
|
|
cond_resched();
|
|
count = 0;
|
|
}
|
|
}
|
|
conn_put(con);
|
|
}
|
|
|
|
static void tipc_send_work(struct work_struct *work)
|
|
{
|
|
struct tipc_conn *con = container_of(work, struct tipc_conn, swork);
|
|
|
|
if (test_bit(CF_CONNECTED, &con->flags))
|
|
tipc_send_to_sock(con);
|
|
|
|
conn_put(con);
|
|
}
|
|
|
|
static void tipc_work_stop(struct tipc_server *s)
|
|
{
|
|
destroy_workqueue(s->rcv_wq);
|
|
destroy_workqueue(s->send_wq);
|
|
}
|
|
|
|
static int tipc_work_start(struct tipc_server *s)
|
|
{
|
|
s->rcv_wq = alloc_workqueue("tipc_rcv", WQ_UNBOUND, 1);
|
|
if (!s->rcv_wq) {
|
|
pr_err("can't start tipc receive workqueue\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
s->send_wq = alloc_workqueue("tipc_send", WQ_UNBOUND, 1);
|
|
if (!s->send_wq) {
|
|
pr_err("can't start tipc send workqueue\n");
|
|
destroy_workqueue(s->rcv_wq);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tipc_server_start(struct tipc_server *s)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock_init(&s->idr_lock);
|
|
idr_init(&s->conn_idr);
|
|
s->idr_in_use = 0;
|
|
|
|
s->rcvbuf_cache = kmem_cache_create(s->name, s->max_rcvbuf_size,
|
|
0, SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!s->rcvbuf_cache)
|
|
return -ENOMEM;
|
|
|
|
ret = tipc_work_start(s);
|
|
if (ret < 0) {
|
|
kmem_cache_destroy(s->rcvbuf_cache);
|
|
return ret;
|
|
}
|
|
ret = tipc_open_listening_sock(s);
|
|
if (ret < 0) {
|
|
tipc_work_stop(s);
|
|
kmem_cache_destroy(s->rcvbuf_cache);
|
|
return ret;
|
|
}
|
|
s->enabled = 1;
|
|
return ret;
|
|
}
|
|
|
|
void tipc_server_stop(struct tipc_server *s)
|
|
{
|
|
struct tipc_conn *con;
|
|
int total = 0;
|
|
int id;
|
|
|
|
if (!s->enabled)
|
|
return;
|
|
|
|
s->enabled = 0;
|
|
spin_lock_bh(&s->idr_lock);
|
|
for (id = 0; total < s->idr_in_use; id++) {
|
|
con = idr_find(&s->conn_idr, id);
|
|
if (con) {
|
|
total++;
|
|
spin_unlock_bh(&s->idr_lock);
|
|
tipc_close_conn(con);
|
|
spin_lock_bh(&s->idr_lock);
|
|
}
|
|
}
|
|
spin_unlock_bh(&s->idr_lock);
|
|
|
|
tipc_work_stop(s);
|
|
kmem_cache_destroy(s->rcvbuf_cache);
|
|
idr_destroy(&s->conn_idr);
|
|
}
|