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

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Date: Fri, 6 Oct 2023 13:40:08 -0700
From: Kees Cook <keescook@...omium.org>
To: Mark Brown <broonie@...nel.org>
Cc: Liam Girdwood <lgirdwood@...il.com>,
	Support Opensource <support.opensource@...semi.com>,
	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 Fri, Sep 22, 2023 at 10:52:07AM -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 da9063_regulators.

Friendly ping. Mark can you pick this up?

Thanks!

-Kees

> 
> [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>
> ---
>  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 */
> -- 
> 2.34.1
> 

-- 
Kees Cook