linux-kernel - Re: [PATCH] overflow: Split up kunit tests for smaller stack frames

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Message-ID: <CAGS_qxoqRrQmECRNAx092j=PArO00NPHansYd8+6TkuFgxe4XQ@mail.gmail.com>
Date:   Wed, 31 Aug 2022 12:01:16 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Vitor Massaru Iha <vitor@...saru.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        kernel test robot <lkp@...el.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] overflow: Split up kunit tests for smaller stack frames

On Wed, Aug 31, 2022 at 11:11 AM Kees Cook <keescook@...omium.org> wrote:
>
> Under some pathological 32-bit configs, the shift overflow KUnit tests
> create huge stack frames. Split up the function to avoid this,
> separating by rough shift overflow cases.
>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Daniel Latypov <dlatypov@...gle.com>
> Cc: Vitor Massaru Iha <vitor@...saru.org>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/lkml/202208301850.iuv9VwA8-lkp@intel.com
> Signed-off-by: Kees Cook <keescook@...omium.org>

Acked-by: Daniel Latypov <dlatypov@...gle.com>

It's sad that we're forced to do this to eliminate such warnings, but
I like this organization a bit better, actually.

I wasn't able to reproduce the stack size warnings in the past, so I
haven't tried to do so here and can't give Tested-by/Reviewed-by.
But I did run the tests and they all still worked for me.