Re: [PATCH] libata: Annotate struct ata_cpr_log with __counted_by

[Gustavo A. R. Silva]

On 9/22/23 11:52, 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 ata_cpr_log.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Damien Le Moal <dlemoal@xxxxxxxxxx>
> Cc: linux-ide@xxxxxxxxxxxxxxx
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>

Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

Thanks
--
Gustavo

> ---
>   include/linux/libata.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/libata.h b/include/linux/libata.h
> index 3c17a5053f00..f91e8e7f1c00 100644
> --- a/include/linux/libata.h
> +++ b/include/linux/libata.h
> @@ -656,7 +656,7 @@ struct ata_cpr {
>   
>   struct ata_cpr_log {
>   	u8			nr_cpr;
> -	struct ata_cpr		cpr[];
> +	struct ata_cpr		cpr[] __counted_by(nr_cpr);
>   };
>   
>   struct ata_device {