tty: fix data race on tty_buffer.commit

Race on buffer data happens when newly committed data is
picked up by an old flush work in the following scenario:
__tty_buffer_request_room does a plain write of tail->commit,
no barriers were executed before that.
At this point flush_to_ldisc reads this new value of commit,
and reads buffer data, no barriers in between.
The committed buffer data is not necessary visible to flush_to_ldisc.

Similar bug happens when tty_schedule_flip commits data.

Update commit with smp_store_release and read commit with
smp_load_acquire, as it is commit that signals data readiness.
This is orthogonal to the existing synchronization on tty_buffer.next,
which is required to not dismiss a buffer with unconsumed data.

The data race was found with KernelThreadSanitizer (KTSAN).

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index b3a5e33948c1..a660ab181cca 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -293,7 +293,10 @@ static int __tty_buffer_request_room(struct tty_port *port, size_t size,
                 if (n != NULL) {
                         n->flags = flags;
                         buf->tail = n;
-                        b->commit = b->used;
+                        /* paired w/ acquire in flush_to_ldisc(); ensures
+                         * flush_to_ldisc() sees buffer data.
+                         */
+                        smp_store_release(&b->commit, b->used);
                         /* paired w/ acquire in flush_to_ldisc(); ensures the
                          * latest commit value can be read before the head is
                          * advanced to the next buffer
@@ -396,7 +399,10 @@ void tty_schedule_flip(struct tty_port *port)
 {
         struct tty_bufhead *buf = &port->buf;
 
-        buf->tail->commit = buf->tail->used;
+        /* paired w/ acquire in flush_to_ldisc(); ensures
+         * flush_to_ldisc() sees buffer data.
+         */
+        smp_store_release(&buf->tail->commit, buf->tail->used);
         schedule_work(&buf->work);
 }
 EXPORT_SYMBOL(tty_schedule_flip);
@@ -494,7 +500,10 @@ static void flush_to_ldisc(struct work_struct *work)
                  * is advancing to the next buffer
                  */
                 next = smp_load_acquire(&head->next);
-                count = head->commit - head->read;
+                /* paired w/ release in __tty_buffer_request_room() or in
+                 * tty_buffer_flush(); ensures we see the committed buffer data
+                 */
+                count = smp_load_acquire(&head->commit) - head->read;
                 if (!count) {
                         if (next == NULL) {
                                 check_other_closed(tty);