linux-hardening - Re: [PATCH] mailbox: zynqmp: Annotate struct zynqmp_ipi_pdata with __counted

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Message-ID: <a6c48181-47af-49db-860e-14812a1c186f@amd.com>
Date: Mon, 2 Oct 2023 12:17:06 +0200
From: Michal Simek <michal.simek@....com>
To: Kees Cook <keescook@...omium.org>, Jassi Brar <jassisinghbrar@...il.com>
CC: <linux-arm-kernel@...ts.infradead.org>, Nathan Chancellor
	<nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix
	<trix@...hat.com>, <linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>,
	<linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] mailbox: zynqmp: Annotate struct zynqmp_ipi_pdata with
 __counted_by



On 9/22/23 19:53, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct zynqmp_ipi_pdata.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Jassi Brar <jassisinghbrar@...il.com>
> Cc: Michal Simek <michal.simek@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>   drivers/mailbox/zynqmp-ipi-mailbox.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
> index e4fcac97dbfa..7fa533e80dd9 100644
> --- a/drivers/mailbox/zynqmp-ipi-mailbox.c
> +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
> @@ -108,7 +108,7 @@ struct zynqmp_ipi_pdata {
>   	unsigned int method;
>   	u32 local_id;
>   	int num_mboxes;
> -	struct zynqmp_ipi_mbox ipi_mboxes[];
> +	struct zynqmp_ipi_mbox ipi_mboxes[] __counted_by(num_mboxes);
>   };
>   
>   static struct device_driver zynqmp_ipi_mbox_driver = {

Acked-by: Michal Simek <michal.simek@....com>

Thanks,
Michal