linux-hardening - Re: [PATCH] mtd: Annotate struct lpddr_private with __counted

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Message-ID: <e0fba1f9-fc9d-81eb-4bd9-9f6db9d75df8@embeddedor.com>
Date:   Fri, 15 Sep 2023 14:48:07 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.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] mtd: Annotate struct lpddr_private with __counted_by



On 9/15/23 14:12, 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 lpddr_private.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Miquel Raynal <miquel.raynal@...tlin.com>
> Cc: Richard Weinberger <richard@....at>
> Cc: Vignesh Raghavendra <vigneshr@...com>
> Cc: linux-mtd@...ts.infradead.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   include/linux/mtd/qinfo.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/mtd/qinfo.h b/include/linux/mtd/qinfo.h
> index 2e3f43788d48..0421f12156b5 100644
> --- a/include/linux/mtd/qinfo.h
> +++ b/include/linux/mtd/qinfo.h
> @@ -24,7 +24,7 @@ struct lpddr_private {
>   	struct qinfo_chip *qinfo;
>   	int numchips;
>   	unsigned long chipshift;
> -	struct flchip chips[];
> +	struct flchip chips[] __counted_by(numchips);
>   };
>   
>   /* qinfo_query_info structure contains request information for