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Re: [PATCH] drivers/xen/xenbus: Replace deprecated strcpy in xenbus_transaction_end
- To: Thorsten Blum <thorsten.blum@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 13 Oct 2025 08:59:11 +0200
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- Cc: linux-hardening@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, "Dr. David Alan Gilbert" <linux@xxxxxxxxxxx>
- Delivery-date: Mon, 13 Oct 2025 06:59:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.10.2025 21:55, Thorsten Blum wrote:
> --- a/drivers/xen/xenbus/xenbus_xs.c
> +++ b/drivers/xen/xenbus/xenbus_xs.c
> @@ -546,16 +546,13 @@ int xenbus_transaction_start(struct xenbus_transaction
> *t)
> EXPORT_SYMBOL_GPL(xenbus_transaction_start);
>
> /* End a transaction.
> - * If abandon is true, transaction is discarded instead of committed.
> + * If abort is true, transaction is discarded instead of committed.
> */
> -int xenbus_transaction_end(struct xenbus_transaction t, int abort)
> +int xenbus_transaction_end(struct xenbus_transaction t, bool abort)
> {
> char abortstr[2];
>
> - if (abort)
> - strcpy(abortstr, "F");
> - else
> - strcpy(abortstr, "T");
While at least in principle a compiler might be able to transform this into
code not using any library function at all, ...
> + strscpy(abortstr, abort ? "F" : "T");
... the use of a n on-standard function (without equivalent compiler builtin)
doesn't permit this. IOW why not simply switch to e.g.
char abortstr[2] = { [0] = abort ? 'F' : 'T' };
Jan
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