linux-kernel - Re: [PATCH] mm/memcg: Annotate struct mem_cgroup_threshold_ary with __counted

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Message-ID: <ZQ8aSNgBiJI7Jr+T@work>
Date:   Sat, 23 Sep 2023 11:03:04 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Yosry Ahmed <yosryahmed@...gle.com>,
        Yu Zhao <yuzhao@...gle.com>, Miaohe Lin <linmiaohe@...wei.com>,
        Yafang Shao <laoar.shao@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] mm/memcg: Annotate struct mem_cgroup_threshold_ary with
 __counted_by

On Fri, Sep 22, 2023 at 10:53:28AM -0700, 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 mem_cgroup_threshold_ary.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Shakeel Butt <shakeelb@...gle.com>
> Cc: Roman Gushchin <roman.gushchin@...ux.dev>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>  include/linux/memcontrol.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 45d0c10e86cc..e0cfab58ab71 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -143,7 +143,7 @@ struct mem_cgroup_threshold_ary {
>  	/* Size of entries[] */
>  	unsigned int size;
>  	/* Array of thresholds */
> -	struct mem_cgroup_threshold entries[];
> +	struct mem_cgroup_threshold entries[] __counted_by(size);
>  };
>  
>  struct mem_cgroup_thresholds {
> -- 
> 2.34.1
> 
>