linux-hardening - Re: [PATCH] spi: mchp-pci1xxxx: Annotate struct pci1xxxx_spi with __counted

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Message-ID: <ZQ8Z2hXuR8F0g/C3@work>
Date: Sat, 23 Sep 2023 11:01:14 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.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] spi: mchp-pci1xxxx: Annotate struct pci1xxxx_spi with
 __counted_by

On Fri, Sep 22, 2023 at 10:53:23AM -0700, 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 pci1xxxx_spi.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Mark Brown <broonie@...nel.org>
> Cc: linux-spi@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>  drivers/spi/spi-pci1xxxx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-pci1xxxx.c b/drivers/spi/spi-pci1xxxx.c
> index 3638e974f5d4..5b2d3e4e21b7 100644
> --- a/drivers/spi/spi-pci1xxxx.c
> +++ b/drivers/spi/spi-pci1xxxx.c
> @@ -77,7 +77,7 @@ struct pci1xxxx_spi {
>  	struct pci_dev *dev;
>  	u8 total_hw_instances;
>  	void __iomem *reg_base;
> -	struct pci1xxxx_spi_internal *spi_int[];
> +	struct pci1xxxx_spi_internal *spi_int[] __counted_by(total_hw_instances);
>  };
>  
>  static const struct pci_device_id pci1xxxx_spi_pci_id_table[] = {
> -- 
> 2.34.1
> 
>