linux-hardening - Re: [PATCH] ALSA: hda: Annotate struct hda_conn_list with __counted

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Date: Sat, 23 Sep 2023 10:30:14 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Jaroslav Kysela <perex@...ex.cz>
Cc: Takashi Iwai <tiwai@...e.com>, Cezary Rojewski
 <cezary.rojewski@...el.com>, alsa-devel@...a-project.org,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
 Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
 Jason Montleon <jmontleo@...hat.com>, linux-kernel@...r.kernel.org,
 llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda: Annotate struct hda_conn_list with
 __counted_by

On 9/22/23 11:50, 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 hda_conn_list.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Jaroslav Kysela <perex@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.com>
> Cc: Cezary Rojewski <cezary.rojewski@...el.com>
> Cc: alsa-devel@...a-project.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   sound/pci/hda/hda_codec.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
> index 33af707a65ab..01718b1fc9a7 100644
> --- a/sound/pci/hda/hda_codec.c
> +++ b/sound/pci/hda/hda_codec.c
> @@ -88,7 +88,7 @@ struct hda_conn_list {
>   	struct list_head list;
>   	int len;
>   	hda_nid_t nid;
> -	hda_nid_t conns[];
> +	hda_nid_t conns[] __counted_by(len);
>   };
>   
>   /* look up the cached results */