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Message-ID: <94848cc3-6f5c-46d7-8cc7-98a4f10865b3@embeddedor.com>
Date: Fri, 6 Oct 2023 22:45:10 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Kalle Valo <kvalo@...nel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
linux-wireless@...r.kernel.org, linux-hardening@...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
Subject: Re: [PATCH] wifi: intersil: hostap: Annotate struct
prism2_download_data with __counted_by
On 10/6/23 22:19, 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 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
> prism2_download_data.
>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: linux-wireless@...r.kernel.org
> Cc: linux-hardening@...r.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Thanks!
--
Gustavo
> ---
> drivers/net/wireless/intersil/hostap/hostap_wlan.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/intersil/hostap/hostap_wlan.h b/drivers/net/wireless/intersil/hostap/hostap_wlan.h
> index c25cd21d18bd..f71c0545c0be 100644
> --- a/drivers/net/wireless/intersil/hostap/hostap_wlan.h
> +++ b/drivers/net/wireless/intersil/hostap/hostap_wlan.h
> @@ -617,7 +617,7 @@ struct prism2_download_data {
> u32 addr; /* wlan card address */
> u32 len;
> u8 *data; /* allocated data */
> - } data[];
> + } data[] __counted_by(num_areas);
> };
>
>
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