diff mbox series

[5.13,31/35] io_uring: explicitly catch any illegal async queue attempt

Message ID 20210806081114.747625953@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Aug. 6, 2021, 8:17 a.m. UTC 
From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit 991468dcf198bb87f24da330676724a704912b47 ]

Catch an illegal case to queue async from an unrelated task that got
the ring fd passed to it. This should not be possible to hit, but
better be proactive and catch it explicitly. io-wq is extended to
check for early IO_WQ_WORK_CANCEL being set on a work item as well,
so it can run the request through the normal cancelation path.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/io-wq.c    |  7 ++++++-
 fs/io_uring.c | 11 +++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 60f58efdb5f4..9efecdf025b9 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -736,7 +736,12 @@  static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
 	int work_flags;
 	unsigned long flags;
 
-	if (test_bit(IO_WQ_BIT_EXIT, &wqe->wq->state)) {
+	/*
+	 * If io-wq is exiting for this task, or if the request has explicitly
+	 * been marked as one that should not get executed, cancel it here.
+	 */
+	if (test_bit(IO_WQ_BIT_EXIT, &wqe->wq->state) ||
+	    (work->flags & IO_WQ_WORK_CANCEL)) {
 		io_run_cancel(work, wqe);
 		return;
 	}
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 86f609fa761c..32f3df13a812 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1282,6 +1282,17 @@  static void io_queue_async_work(struct io_kiocb *req)
 
 	/* init ->work of the whole link before punting */
 	io_prep_async_link(req);
+
+	/*
+	 * Not expected to happen, but if we do have a bug where this _can_
+	 * happen, catch it here and ensure the request is marked as
+	 * canceled. That will make io-wq go through the usual work cancel
+	 * procedure rather than attempt to run this request (or create a new
+	 * worker for it).
+	 */
+	if (WARN_ON_ONCE(!same_thread_group(req->task, current)))
+		req->work.flags |= IO_WQ_WORK_CANCEL;
+
 	trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req,
 					&req->work, req->flags);
 	io_wq_enqueue(tctx->io_wq, &req->work);