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Message-ID: <17cda7da-a70f-8d0d-4224-c82b0ddc4364@embeddedor.com>
Date: Sat, 23 Sep 2023 10:35:07 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
Damien Le Moal <dlemoal@...nel.org>
Cc: linux-ide@...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] libata: Annotate struct ata_cpr_log with __counted_by
On 9/22/23 11:52, 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 ata_cpr_log.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Damien Le Moal <dlemoal@...nel.org>
> Cc: linux-ide@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Thanks
--
Gustavo
> ---
> include/linux/libata.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/libata.h b/include/linux/libata.h
> index 3c17a5053f00..f91e8e7f1c00 100644
> --- a/include/linux/libata.h
> +++ b/include/linux/libata.h
> @@ -656,7 +656,7 @@ struct ata_cpr {
>
> struct ata_cpr_log {
> u8 nr_cpr;
> - struct ata_cpr cpr[];
> + struct ata_cpr cpr[] __counted_by(nr_cpr);
> };
>
> struct ata_device {
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