linux-hardening - Re: [PATCH] sparc: Annotate struct cpuinfo_tree with __counted

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Date: Sat, 23 Sep 2023 10:34:26 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, "David S. Miller" <davem@...emloft.net>
Cc: sparclinux@...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] sparc: Annotate struct cpuinfo_tree with __counted_by



On 9/22/23 11:52, 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 cpuinfo_tree.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: sparclinux@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   arch/sparc/kernel/cpumap.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/sparc/kernel/cpumap.c b/arch/sparc/kernel/cpumap.c
> index f07ea88a83af..8fcf2d8c6bd2 100644
> --- a/arch/sparc/kernel/cpumap.c
> +++ b/arch/sparc/kernel/cpumap.c
> @@ -50,7 +50,7 @@ struct cpuinfo_tree {
>   
>   	/* Offsets into nodes[] for each level of the tree */
>   	struct cpuinfo_level level[CPUINFO_LVL_MAX];
> -	struct cpuinfo_node  nodes[];
> +	struct cpuinfo_node  nodes[] __counted_by(total_nodes);
>   };
>   
>