linux-kernel - Re: [PATCH mm v3] kasan: fix array-bounds warnings in tests

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Message-ID: <202209261123.91B4E71B2F@keescook>
Date:   Mon, 26 Sep 2022 11:23:11 -0700
From:   Kees Cook <keescook@...omium.org>
To:     andrey.konovalov@...ux.dev
Cc:     Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH mm v3] kasan: fix array-bounds warnings in tests

On Mon, Sep 26, 2022 at 08:08:47PM +0200, andrey.konovalov@...ux.dev wrote:
> From: Andrey Konovalov <andreyknvl@...gle.com>
> 
> GCC's -Warray-bounds option detects out-of-bounds accesses to
> statically-sized allocations in krealloc out-of-bounds tests.
> 
> Use OPTIMIZER_HIDE_VAR to suppress the warning.
> 
> Also change kmalloc_memmove_invalid_size to use OPTIMIZER_HIDE_VAR
> instead of a volatile variable.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook