linux-hardening - Re: [PATCH] interconnect: qcom: Annotate struct icc_onecell_data with __counted

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Message-ID: <ad30a8ed-87d3-46dd-8b34-83f6cfac0e4a@linaro.org>
Date:   Thu, 17 Aug 2023 23:24:23 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Kees Cook <keescook@...omium.org>, Andy Gross <agross@...nel.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        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] interconnect: qcom: Annotate struct icc_onecell_data with
 __counted_by

On 17.08.2023 22:42, 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 icc_onecell_data.
> Additionally, since the element count member must be set before accessing
> the annotated flexible array member, move its initialization earlier.
> 
> [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: Georgi Djakov <djakov@...nel.org>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
Very nice, thanks

Acked-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad