linux-hardening - Re: [PATCH] regulator: da9063: Annotate struct da9063_regulators with __counted

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Date: Sat, 23 Sep 2023 10:34:56 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Support Opensource <support.opensource@...semi.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.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] regulator: da9063: Annotate struct da9063_regulators with
 __counted_by



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 da9063_regulators.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Support Opensource <support.opensource@...semi.com>
> Cc: Liam Girdwood <lgirdwood@...il.com>
> Cc: Mark Brown <broonie@...nel.org>
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/regulator/da9063-regulator.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/regulator/da9063-regulator.c b/drivers/regulator/da9063-regulator.c
> index a0621665a6d2..82bf321ae06f 100644
> --- a/drivers/regulator/da9063-regulator.c
> +++ b/drivers/regulator/da9063-regulator.c
> @@ -158,7 +158,7 @@ struct da9063_regulator {
>   struct da9063_regulators {
>   	unsigned int				n_regulators;
>   	/* Array size to be defined during init. Keep at end. */
> -	struct da9063_regulator			regulator[];
> +	struct da9063_regulator			regulator[] __counted_by(n_regulators);
>   };
>   
>   /* BUCK modes for DA9063 */