OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

tty: Fix data race between tiocsti() and flush_to_ldisc()

Browse Source 
commit bb2853a6a421a052268eee00fd5d3f6b3504b2b1 upstream.

The ops->receive_buf() may be accessed concurrently from these two
functions.  If the driver flushes data to the line discipline
receive_buf() method while tiocsti() is waiting for the
ops->receive_buf() to finish its work, the data race will happen.

For example:
tty_ioctl			|tty_ldisc_receive_buf
 ->tioctsi			| ->tty_port_default_receive_buf
				|  ->tty_ldisc_receive_buf
   ->hci_uart_tty_receive	|   ->hci_uart_tty_receive
    ->h4_recv                   |    ->h4_recv

In this case, the h4 receive buffer will be overwritten by the
latecomer, and we will lost the data.

Hence, change tioctsi() function to use the exclusive lock interface
from tty_buffer to avoid the data race.

Reported-by: syzbot+97388eb9d31b997fe1d0@syzkaller.appspotmail.com
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Nguyen Dinh Phi <phind.uet@gmail.com>
Link: https://lore.kernel.org/r/20210823000641.2082292-1-phind.uet@gmail.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nguyen Dinh Phi 2021-08-23 08:06:41 +08:00 committed by Greg Kroah-Hartman
parent 7a25a0a94c
commit 03c3e977ee
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/tty/tty_io.c
View File

@ -2176,8 +2176,6 @@ static int tty_fasync(int fd, struct file *filp, int on)
* Locking:
* Called functions take tty_ldiscs_lock
* current->signal->tty check is safe without locks
*
* FIXME: may race normal receive processing
*/
static int tiocsti(struct tty_struct *tty, char __user *p)
@ -2193,8 +2191,10 @@ static int tiocsti(struct tty_struct *tty, char __user *p)
ld = tty_ldisc_ref_wait(tty);
if (!ld)
return -EIO;
tty_buffer_lock_exclusive(tty->port);
if (ld->ops->receive_buf)
ld->ops->receive_buf(tty, &ch, &mbz, 1);
tty_buffer_unlock_exclusive(tty->port);
tty_ldisc_deref(ld);
return 0;
}