linux-kernel - Re: [PATCH] aio: Annotate struct kioctx_table with __counted

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Date:   Fri, 15 Sep 2023 14:50:23 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Benjamin LaHaise <bcrl@...ck.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>, linux-aio@...ck.org,
        linux-fsdevel@...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] aio: Annotate struct kioctx_table with __counted_by



On 9/15/23 14:14, 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 kioctx_table.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Benjamin LaHaise <bcrl@...ck.org>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: Christian Brauner <brauner@...nel.org>
> Cc: linux-aio@...ck.org
> Cc: linux-fsdevel@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   fs/aio.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/aio.c b/fs/aio.c
> index a4c2a6bac72c..f8589caef9c1 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -80,7 +80,7 @@ struct aio_ring {
>   struct kioctx_table {
>   	struct rcu_head		rcu;
>   	unsigned		nr;
> -	struct kioctx __rcu	*table[];
> +	struct kioctx __rcu	*table[] __counted_by(nr);
>   };
>   
>   struct kioctx_cpu {