From: veygax <veyga@veygax.dev>
To: Christoph Hellwig <hch@infradead.org>, Keith Busch <kbusch@kernel.org>
Cc: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
"io-uring@vger.kernel.org" <io-uring@vger.kernel.org>,
Caleb Sander Mateos <csander@purestorage.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] io_uring/rsrc: fix slab-out-of-bounds in io_buffer_register_bvec
Date: Mon, 22 Dec 2025 01:02:47 +0000 [thread overview]
Message-ID: <e0054c50-3ea2-48e4-b913-8cd861a34f72@veygax.dev> (raw)
In-Reply-To: <aUTjxJEDYYfOT_QG@infradead.org>
On 19/12/2025 05:33, Christoph Hellwig wrote:
> The above is simply an open coded version of doing repeated
> __bio_add_page calls. Which would be rather suboptimal, but perfectly
> valid.
I can confirm iterating over num_bvecs in __bio_add_page produces the
same KASAN output.
for (i = 0; i < num_bvecs; i++)
__bio_add_page(bio, page + i, PAGE_SIZE, 0);
Also (to all CC's), please disregard this version of the patch. V2 has
been posted with typos fixed and a more performance efficient approach.
https://lore.kernel.org/io-uring/20251217214753.218765-3-veyga@veygax.dev/
--
- Evan Lambert / veygax
prev parent reply other threads:[~2025-12-22 1:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-17 21:04 [PATCH] io_uring/rsrc: fix slab-out-of-bounds in io_buffer_register_bvec veygax
2025-12-17 21:22 ` Caleb Sander Mateos
2025-12-18 0:32 ` Ming Lei
2025-12-18 0:37 ` veygax
2025-12-18 0:56 ` Keith Busch
2025-12-18 1:13 ` veygax
2025-12-18 2:58 ` Ming Lei
2025-12-18 23:00 ` Keith Busch
2025-12-19 3:28 ` Jens Axboe
2025-12-19 5:33 ` Christoph Hellwig
2025-12-21 23:29 ` Keith Busch
2025-12-22 22:08 ` Christoph Hellwig
2025-12-22 1:02 ` veygax [this message]
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