linux-hardening - Re: [PATCH] kasan: test: Consolidate workarounds for unwanted __alloc

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Message-ID: <CAK8P3a0jCxafw2mM8uDGXuZM7PsJa6mBpuHTc7+CkEDcDfeqSQ@mail.gmail.com>
Date:   Wed, 20 Oct 2021 21:41:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] kasan: test: Consolidate workarounds for unwanted
 __alloc_size() protection

On Wed, Oct 20, 2021 at 9:38 PM Kees Cook <keescook@...omium.org> wrote:
>
> This fixes kasan-test-use-underlying-string-helpers.patch to avoid needing
> new helpers. As done in kasan-test-bypass-__alloc_size-checks.patch,
> just use OPTIMIZER_HIDE_VAR(). Additionally converts a use of
> "volatile", which was trying to work around similar detection.
>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> Cc: Andrey Konovalov <andreyknvl@...il.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: kasan-dev@...glegroups.com
> Signed-off-by: Kees Cook <keescook@...omium.org>

Yes, that's much better than my version

Acked-by: Arnd Bergmann <arnd@...db.de>