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

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Message-ID: <ZQ4UXsxrFfNTNsM7@P9FQF9L96D.corp.robot.car>
Date:   Fri, 22 Sep 2023 15:25:34 -0700
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        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>

Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>

Thanks!