linux-kernel - Re: [PATCH -next 0/2] Introduce memset

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Message-ID: <202112072125.AC79323201@keescook>
Date:   Tue, 7 Dec 2021 21:27:47 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Xiu Jianfeng <xiujianfeng@...wei.com>
Cc:     akpm@...ux-foundation.org, laniel_francis@...vacyrequired.com,
        andriy.shevchenko@...ux.intel.com, adobriyan@...il.com,
        linux@...ck-us.net, andreyknvl@...il.com, dja@...ens.net,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH -next 0/2] Introduce memset_range() helper for wiping
 members

On Wed, Dec 08, 2021 at 11:04:49AM +0800, Xiu Jianfeng wrote:
> Xiu Jianfeng (2):
>   string.h: Introduce memset_range() for wiping members

For doing a memset range, the preferred method is to use
a struct_group in the structure itself. This makes the range
self-documenting, and allows the compile to validate the exact size,
makes it addressable, etc. The other memset helpers are for "everything
to the end", which doesn't usually benefit from the struct_group style
of range declaration.

>   bpf: use memset_range helper in __mark_reg_known

I never saw this patch arrive on the list?

-- 
Kees Cook