linux-hardening - Re: [PATCH] audit: Annotate struct audit_chunk with __counted

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Date:   Thu, 17 Aug 2023 14:59:44 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>, Paul Moore <paul@...l-moore.com>
Cc:     Eric Paris <eparis@...hat.com>, audit@...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] audit: Annotate struct audit_chunk with __counted_by



On 8/17/23 14:35, 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 audit_chunk.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Paul Moore <paul@...l-moore.com>
> Cc: Eric Paris <eparis@...hat.com>
> Cc: audit@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>   kernel/audit_tree.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
> index e867c17d3f84..85a5b306733b 100644
> --- a/kernel/audit_tree.c
> +++ b/kernel/audit_tree.c
> @@ -34,7 +34,7 @@ struct audit_chunk {
>   		struct list_head list;
>   		struct audit_tree *owner;
>   		unsigned index;		/* index; upper bit indicates 'will prune' */
> -	} owners[];
> +	} owners[] __counted_by(count);
>   };
>   
>   struct audit_tree_mark {