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char-socket: Lock tcp_chr_disconnect() and socket_reconnect_timeout() 

There's a race condition in which the tcp_chr_read() ioc handler can
close a connection that is being written to from another thread.

Running iotest 136 in a loop triggers this problem and crashes QEMU.

 (gdb) bt
 #0  0x00005558b842902d in object_get_class (obj=0x0) at qom/object.c:860
 #1  0x00005558b84f92db in qio_channel_writev_full (ioc=0x0, iov=0x7ffc355decf0, niov=1, fds=0x0, nfds=0, errp=0x0) at io/channel.c:76
 #2  0x00005558b84e0e9e in io_channel_send_full (ioc=0x0, buf=0x5558baf5beb0, len=138, fds=0x0, nfds=0) at chardev/char-io.c:123
 #3  0x00005558b84e4a69 in tcp_chr_write (chr=0x5558ba460380, buf=0x5558baf5beb0 "...", len=138) at chardev/char-socket.c:135
 #4  0x00005558b84dca55 in qemu_chr_write_buffer (s=0x5558ba460380, buf=0x5558baf5beb0 "...", len=138, offset=0x7ffc355dedd0, write_all=false) at chardev/char.c:112
 #5  0x00005558b84dcbc2 in qemu_chr_write (s=0x5558ba460380, buf=0x5558baf5beb0 "...", len=138, write_all=false) at chardev/char.c:147
 #6  0x00005558b84dfb26 in qemu_chr_fe_write (be=0x5558ba476610, buf=0x5558baf5beb0 "...", len=138) at chardev/char-fe.c:42
 #7  0x00005558b8088c86 in monitor_flush_locked (mon=0x5558ba476610) at monitor.c:406
 #8  0x00005558b8088e8c in monitor_puts (mon=0x5558ba476610, str=0x5558ba921e49 "") at monitor.c:449
 #9  0x00005558b8089178 in qmp_send_response (mon=0x5558ba476610, rsp=0x5558bb161600) at monitor.c:498
 #10 0x00005558b808920c in monitor_qapi_event_emit (event=QAPI_EVENT_SHUTDOWN, qdict=0x5558bb161600) at monitor.c:526
 #11 0x00005558b8089307 in monitor_qapi_event_queue_no_reenter (event=QAPI_EVENT_SHUTDOWN, qdict=0x5558bb161600) at monitor.c:551
 #12 0x00005558b80896c0 in qapi_event_emit (event=QAPI_EVENT_SHUTDOWN, qdict=0x5558bb161600) at monitor.c:626
 #13 0x00005558b855f23b in qapi_event_send_shutdown (guest=false, reason=SHUTDOWN_CAUSE_HOST_QMP_QUIT) at qapi/qapi-events-run-state.c:43
 #14 0x00005558b81911ef in qemu_system_shutdown (cause=SHUTDOWN_CAUSE_HOST_QMP_QUIT) at vl.c:1837
 #15 0x00005558b8191308 in main_loop_should_exit () at vl.c:1885
 #16 0x00005558b819140d in main_loop () at vl.c:1924
 #17 0x00005558b8198c84 in main (argc=18, argv=0x7ffc355df3f8, envp=0x7ffc355df490) at vl.c:4665

This patch adds a lock to protect tcp_chr_disconnect() and
socket_reconnect_timeout()

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Message-Id: <1565625509-404969-3-git-send-email-andrey.shinkevich@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alberto Garcia 2019-08-12 18:58:29 +03:00 committed by Paolo Bonzini
parent b65cb867cc
commit 78d01598ae
1 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
chardev/char-socket.c
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@ -150,7 +150,7 @@ static void tcp_chr_accept(QIONetListener *listener,
void *opaque);
static int tcp_chr_read_poll(void *opaque);
static void tcp_chr_disconnect(Chardev *chr);
static void tcp_chr_disconnect_locked(Chardev *chr);
/* Called with chr_write_lock held. */
static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
@ -174,7 +174,7 @@ static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
if (ret < 0 && errno != EAGAIN) {
if (tcp_chr_read_poll(chr) <= 0) {
tcp_chr_disconnect(chr);
tcp_chr_disconnect_locked(chr);
return len;
} /* else let the read handler finish it properly */
}
@ -469,8 +469,9 @@ static void update_disconnected_filename(SocketChardev *s)
/* NB may be called even if tcp_chr_connect has not been
* reached, due to TLS or telnet initialization failure,
* so can *not* assume s->state == TCP_CHARDEV_STATE_CONNECTED
* This must be called with chr->chr_write_lock held.
*/
static void tcp_chr_disconnect(Chardev *chr)
static void tcp_chr_disconnect_locked(Chardev *chr)
{
SocketChardev *s = SOCKET_CHARDEV(chr);
bool emit_close = s->state == TCP_CHARDEV_STATE_CONNECTED;
@ -490,6 +491,13 @@ static void tcp_chr_disconnect(Chardev *chr)
}
}
static void tcp_chr_disconnect(Chardev *chr)
{
qemu_mutex_lock(&chr->chr_write_lock);
tcp_chr_disconnect_locked(chr);
qemu_mutex_unlock(&chr->chr_write_lock);
}
static gboolean tcp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
{
Chardev *chr = CHARDEV(opaque);
@ -1131,8 +1139,10 @@ static gboolean socket_reconnect_timeout(gpointer opaque)
Chardev *chr = CHARDEV(opaque);
SocketChardev *s = SOCKET_CHARDEV(opaque);
qemu_mutex_lock(&chr->chr_write_lock);
g_source_unref(s->reconnect_timer);
s->reconnect_timer = NULL;
qemu_mutex_unlock(&chr->chr_write_lock);
if (chr->be_open) {
return false;