Re: [PATCH 05/15] Add io_uring IO interface

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On 2019-01-16 18:49, Jens Axboe wrote:

[...]

+static int io_allocate_scq_urings(struct io_ring_ctx *ctx,
+				  struct io_uring_params *p)
+{
+	struct io_sq_ring *sq_ring;
+	struct io_cq_ring *cq_ring;
+	size_t size;
+	int ret;
+
+	sq_ring = io_mem_alloc(struct_size(sq_ring, array, p->sq_entries));

It seems that sq_entries, cq_entries are not limited at all.  Can nasty
app consume a lot of kernel pages calling io_setup_uring() from a loop
passing random entries number? (or even better: decreasing entries number,
in order to consume all pages orders with min number of loops).

--
Roman




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