[PATCH 5.13 100/104] io_uring: fix race in unified task_work running

Greg Kroah-Hartman
2021-08-02T14:14:28Z

From: Jens Axboe <axboe@kernel.dk>

commit 110aa25c3ce417a44e35990cf8ed22383277933a upstream.

We use a bit to manage if we need to add the shared task_work, but
a list + lock for the pending work. Before aborting a current run
of the task_work we check if the list is empty, but we do so without
grabbing the lock that protects it. This can lead to races where
we think we have nothing left to run, where in practice we could be
racing with a task adding new work to the list. If we do hit that
race condition, we could be left with work items that need processing,
but the shared task_work is not active.

Ensure that we grab the lock before checking if the list is empty,
so we know if it's safe to exit the run or not.

Link: https://lore.kernel.org/io-uring/c6bd5987-e9ae-cd02-49d0-1b3ac1ef65b1@tnonline.net/
Cc: stable@vger.kernel.org # 5.11+
Reported-by: Forza <forza@tnonline.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/io_uring.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1899,7 +1899,7 @@ static void tctx_task_work(struct callba

clear_bit(0, &tctx->task_state);

- while (!wq_list_empty(&tctx->task_list)) {
+ while (true) {
struct io_ring_ctx *ctx = NULL;
struct io_wq_work_list list;
struct io_wq_work_node *node;
@@ -1909,6 +1909,9 @@ static void tctx_task_work(struct callba
INIT_WQ_LIST(&tctx->task_list);
spin_unlock_irq(&tctx->task_lock);

+ if (wq_list_empty(&list))
+ break;
+
node = list.first;
while (node) {
struct io_wq_work_node *next = node->next;