linux-hardening - Re: [PATCH] i3c/master/mipi-i3c-hci: Annotate struct hci_rings_data with __counted

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Message-ID: <9ae58a8a-04c1-90ac-cf50-7366bff42084@embeddedor.com>
Date: Sat, 23 Sep 2023 10:28:52 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Nicolas Pitre <npitre@...libre.com>, Len Baker <len.baker@....com>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 linux-i3c@...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] i3c/master/mipi-i3c-hci: Annotate struct hci_rings_data
 with __counted_by

On 9/22/23 11:50, 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 hci_rings_data.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Nicolas Pitre <npitre@...libre.com>
> Cc: Len Baker <len.baker@....com>
> Cc: Boris Brezillon <boris.brezillon@...labora.com>
> Cc: linux-i3c@...ts.infradead.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/i3c/master/mipi-i3c-hci/dma.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c
> index 2990ac9eaade..a1ecdfc35641 100644
> --- a/drivers/i3c/master/mipi-i3c-hci/dma.c
> +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c
> @@ -139,7 +139,7 @@ struct hci_rh_data {
>   
>   struct hci_rings_data {
>   	unsigned int total;
> -	struct hci_rh_data headers[];
> +	struct hci_rh_data headers[] __counted_by(total);
>   };
>   
>   struct hci_dma_dev_ibi_data {