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

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Message-ID: <CALvZod7gc7bzp3HVv6v23rRfZe0ZrLT=qow_W7nF0CnsXFxuwQ@mail.gmail.com>
Date: Fri, 22 Sep 2023 12:11:18 -0700
From: Shakeel Butt <shakeelb@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 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 AM Kees Cook <keescook@...omium.org> 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: Shakeel Butt <shakeelb@...gle.com>