linux-kernel - Re: [PATCH] watch_queue: Annotate struct watch_filter with __counted

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Message-ID: <04d51691-4f58-f126-0f32-9ed398182b40@embeddedor.com>
Date:   Sat, 23 Sep 2023 10:38:11 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        David Howells <dhowells@...hat.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Siddh Raman Pant <code@...dh.me>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Qian Cai <cai@...hat.com>,
        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] watch_queue: Annotate struct watch_filter with
 __counted_by



On 9/22/23 11:54, 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 watch_filter.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: David Howells <dhowells@...hat.com>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Christian Brauner <brauner@...nel.org>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Siddh Raman Pant <code@...dh.me>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Qian Cai <cai@...hat.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   include/linux/watch_queue.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/watch_queue.h b/include/linux/watch_queue.h
> index 45cd42f55d49..429c7b6afead 100644
> --- a/include/linux/watch_queue.h
> +++ b/include/linux/watch_queue.h
> @@ -32,7 +32,7 @@ struct watch_filter {
>   		DECLARE_BITMAP(type_filter, WATCH_TYPE__NR);
>   	};
>   	u32			nr_filters;	/* Number of filters */
> -	struct watch_type_filter filters[];
> +	struct watch_type_filter filters[] __counted_by(nr_filters);
>   };
>   
>   struct watch_queue {