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Message-ID: <202008261241.074D8765@keescook>
Date: Wed, 26 Aug 2020 12:43:07 -0700
From: Kees Cook <keescook@...omium.org>
To: Stefano Garzarella <sgarzare@...hat.com>
Cc: Jens Axboe <axboe@...nel.dk>,
Christian Brauner <christian.brauner@...ntu.com>,
Jann Horn <jannh@...gle.com>, Jeff Moyer <jmoyer@...hat.com>,
linux-fsdevel@...r.kernel.org, Sargun Dhillon <sargun@...gun.me>,
Alexander Viro <viro@...iv.linux.org.uk>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Stefan Hajnoczi <stefanha@...hat.com>, linux-kernel@...r.kernel.org,
Aleksa Sarai <asarai@...e.de>, io-uring@...r.kernel.org
Subject: Re: [PATCH v4 1/3] io_uring: use an enumeration for
io_uring_register(2) opcodes
On Thu, Aug 13, 2020 at 05:32:52PM +0200, Stefano Garzarella wrote:
> The enumeration allows us to keep track of the last
> io_uring_register(2) opcode available.
>
> Behaviour and opcodes names don't change.
>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> ---
> include/uapi/linux/io_uring.h | 27 ++++++++++++++++-----------
> 1 file changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
> index d65fde732518..cdc98afbacc3 100644
> --- a/include/uapi/linux/io_uring.h
> +++ b/include/uapi/linux/io_uring.h
> @@ -255,17 +255,22 @@ struct io_uring_params {
> /*
> * io_uring_register(2) opcodes and arguments
> */
> -#define IORING_REGISTER_BUFFERS 0
> -#define IORING_UNREGISTER_BUFFERS 1
> -#define IORING_REGISTER_FILES 2
> -#define IORING_UNREGISTER_FILES 3
> -#define IORING_REGISTER_EVENTFD 4
> -#define IORING_UNREGISTER_EVENTFD 5
> -#define IORING_REGISTER_FILES_UPDATE 6
> -#define IORING_REGISTER_EVENTFD_ASYNC 7
> -#define IORING_REGISTER_PROBE 8
> -#define IORING_REGISTER_PERSONALITY 9
> -#define IORING_UNREGISTER_PERSONALITY 10
> +enum {
> + IORING_REGISTER_BUFFERS,
Actually, one *tiny* thought. Since this is UAPI, do we want to be extra
careful here and explicitly assign values? We can't change the meaning
of a number (UAPI) but we can add new ones, etc? This would help if an
OP were removed (to stop from triggering a cascade of changed values)...
for example:
enum {
IORING_REGISTER_BUFFERS = 0,
IORING_UNREGISTER_BUFFERS = 1,
...
--
Kees Cook
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