Commit 3ec482d1 authored Apr 08, 2019 by Jens Axboe

io_uring: restrict IORING_SETUP_SQPOLL to root



This options spawns a kernel side thread that will poll for submissions
(and completions, if IORING_SETUP_IOPOLL is set). As this allows a user
to potentially use more cycles outside of the normal hierarchy,
restrict the use of this feature to root.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 70423667

fs/io_uring.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -2245,6 +2245,10 @@ static int io_sq_offload_start(struct io_ring_ctx *ctx,
		goto err;

		if (ctx->flags & IORING_SETUP_SQPOLL) {
		ret = -EPERM;
		if (!capable(CAP_SYS_ADMIN))
		goto err;

		if (p->flags & IORING_SETUP_SQ_AFF) {
		int cpu;