linux-kernel - Re: [PATCH] hte: Annotate struct hte_device with __counted

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Message-ID: <0d9a5fc1-1481-2c62-2a77-c8d46ee54f92@embeddedor.com>
Date:   Sat, 23 Sep 2023 10:37:39 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>, Dipen Patel <dipenp@...dia.com>
Cc:     timestamp@...ts.linux.dev, 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] hte: Annotate struct hte_device with __counted_by



On 9/22/23 11:53, 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 hte_device.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Dipen Patel <dipenp@...dia.com>
> Cc: timestamp@...ts.linux.dev
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/hte/hte.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hte/hte.c b/drivers/hte/hte.c
> index 598a716b7364..1fd8d2d4528b 100644
> --- a/drivers/hte/hte.c
> +++ b/drivers/hte/hte.c
> @@ -88,7 +88,7 @@ struct hte_device {
>   	struct list_head list;
>   	struct hte_chip *chip;
>   	struct module *owner;
> -	struct hte_ts_info ei[];
> +	struct hte_ts_info ei[] __counted_by(nlines);
>   };
>   
>   #ifdef CONFIG_DEBUG_FS