linux-hardening - Re: [PATCH] drivers: thermal: tsens: Annotate struct tsens_priv with __counted

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Message-ID: <436d7488-1a20-b6af-8e3f-f151ba2c210d@embeddedor.com>
Date: Sat, 23 Sep 2023 10:37:30 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Andy Gross <agross@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Amit Kucheria <amitk@...nel.org>,
 Thara Gopinath <thara.gopinath@...il.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>,
 linux-arm-msm@...r.kernel.org, linux-pm@...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] drivers: thermal: tsens: Annotate struct tsens_priv with
 __counted_by

On 9/22/23 11:53, 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 tsens_priv.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Andy Gross <agross@...nel.org>
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: Konrad Dybcio <konrad.dybcio@...aro.org>
> Cc: Amit Kucheria <amitk@...nel.org>
> Cc: Thara Gopinath <thara.gopinath@...il.com>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/thermal/qcom/tsens.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
> index 2805de1c6827..cb637fa289ca 100644
> --- a/drivers/thermal/qcom/tsens.h
> +++ b/drivers/thermal/qcom/tsens.h
> @@ -585,7 +585,7 @@ struct tsens_priv {
>   	struct dentry			*debug_root;
>   	struct dentry			*debug;
>   
> -	struct tsens_sensor		sensor[];
> +	struct tsens_sensor		sensor[] __counted_by(num_sensors);
>   };
>   
>   /**