linux-hardening - Re: [PATCH] clk: qcom: clk-spmi-pmic-div: Annotate struct spmi_pmic_div_clk_cc with __counted

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Date:   Thu, 17 Aug 2023 14:58:01 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...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] clk: qcom: clk-spmi-pmic-div: Annotate struct
 spmi_pmic_div_clk_cc with __counted_by



On 8/17/23 14:29, 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 spmi_pmic_div_clk_cc.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: Andy Gross <agross@...nel.org>
> Cc: Konrad Dybcio <konrad.dybcio@...aro.org>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: linux-clk@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>   drivers/clk/qcom/clk-spmi-pmic-div.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/qcom/clk-spmi-pmic-div.c b/drivers/clk/qcom/clk-spmi-pmic-div.c
> index f846be285f51..f394031eb0e5 100644
> --- a/drivers/clk/qcom/clk-spmi-pmic-div.c
> +++ b/drivers/clk/qcom/clk-spmi-pmic-div.c
> @@ -177,7 +177,7 @@ static const struct clk_ops clk_spmi_pmic_div_ops = {
>   
>   struct spmi_pmic_div_clk_cc {
>   	int		nclks;
> -	struct clkdiv	clks[];
> +	struct clkdiv	clks[] __counted_by(nclks);
>   };
>   
>   static struct clk_hw *