linux-kernel - Re: [PATCH] string: use __builtin

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Message-ID: <CAG_fn=UzQ-jnQrxzvLE6EV37zSVCOGPmsVTxyfp1wXzBir4vAg@mail.gmail.com>
Date:   Fri, 28 Apr 2023 15:48:28 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, elver@...gle.com, dvyukov@...gle.com,
        kasan-dev@...glegroups.com, andy@...nel.org,
        ndesaulniers@...gle.com, nathan@...nel.org
Subject: Re: [PATCH] string: use __builtin_memcpy() in strlcpy/strlcat

>
> I *think* this isn't a problem for CONFIG_FORTIFY, since these will be
> replaced and checked separately -- but it still seems strange that you
> need to explicitly use __builtin_memcpy.
>
> Does this end up changing fortify coverage?

Is fortify relevant here? Note that the whole file is compiled with
__NO_FORTIFY.