linux-hardening - Re: [PATCH] firewire: Annotate struct fw_node with __counted

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Date: Sat, 23 Sep 2023 10:37:06 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Takashi Sakamoto <o-takashi@...amocchi.jp>
Cc: linux1394-devel@...ts.sourceforge.net,
 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] firewire: Annotate struct fw_node with __counted_by



On 9/22/23 11:53, 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 fw_node.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Takashi Sakamoto <o-takashi@...amocchi.jp>
> Cc: linux1394-devel@...ts.sourceforge.net
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/firewire/core.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
> index 2a05f411328f..95c10f3d2282 100644
> --- a/drivers/firewire/core.h
> +++ b/drivers/firewire/core.h
> @@ -191,7 +191,7 @@ struct fw_node {
>   	/* Upper layer specific data. */
>   	void *data;
>   
> -	struct fw_node *ports[];
> +	struct fw_node *ports[] __counted_by(port_count);
>   };
>   
>   static inline struct fw_node *fw_node_get(struct fw_node *node)