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* [PATCH][next] io_uring: replace zero-length array with flexible-array member
@ 2022-06-28 19:33 Gustavo A. R. Silva
  2022-06-28 19:38 ` Jens Axboe
  0 siblings, 1 reply; 3+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-28 19:33 UTC (permalink / raw)
  To: Jens Axboe, Pavel Begunkov
  Cc: io-uring, linux-kernel, Gustavo A. R. Silva, linux-hardening

There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
 include/uapi/linux/io_uring.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 09e7c3b13d2d..65345848be2f 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -492,7 +492,7 @@ struct io_uring_probe {
 	__u8 ops_len;	/* length of ops[] array below */
 	__u16 resv;
 	__u32 resv2[3];
-	struct io_uring_probe_op ops[0];
+	struct io_uring_probe_op ops[];
 };
 
 struct io_uring_restriction {
-- 
2.27.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH][next] io_uring: replace zero-length array with flexible-array member
  2022-06-28 19:33 [PATCH][next] io_uring: replace zero-length array with flexible-array member Gustavo A. R. Silva
@ 2022-06-28 19:38 ` Jens Axboe
  2022-06-28 19:54   ` Gustavo A. R. Silva
  0 siblings, 1 reply; 3+ messages in thread
From: Jens Axboe @ 2022-06-28 19:38 UTC (permalink / raw)
  To: Gustavo A. R. Silva, Pavel Begunkov
  Cc: io-uring, linux-kernel, linux-hardening

On 6/28/22 1:33 PM, Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use ?flexible array members?[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
> 
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Thanks for sending this separately. As mentioned out-of-band, we already
have it like this in the io_uring.h header in liburing.

Applied for 5.20.

-- 
Jens Axboe


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH][next] io_uring: replace zero-length array with flexible-array member
  2022-06-28 19:38 ` Jens Axboe
@ 2022-06-28 19:54   ` Gustavo A. R. Silva
  0 siblings, 0 replies; 3+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-28 19:54 UTC (permalink / raw)
  To: Jens Axboe; +Cc: Pavel Begunkov, io-uring, linux-kernel, linux-hardening

On Tue, Jun 28, 2022 at 01:38:44PM -0600, Jens Axboe wrote:
> Thanks for sending this separately. As mentioned out-of-band, we already
> have it like this in the io_uring.h header in liburing.
> 
> Applied for 5.20.

Great! :)

Thanks, Jens.
--
Gustavo

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2022-06-28 20:02 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2022-06-28 19:33 [PATCH][next] io_uring: replace zero-length array with flexible-array member Gustavo A. R. Silva
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2022-06-28 19:54   ` Gustavo A. R. Silva

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