linux-hardening - Re: [PATCH] lib: overflow: Always build 64-bit test cases

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Date:   Wed, 11 May 2022 11:27:26 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        kernel test robot <lkp@...el.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Vitor Massaru Iha <vitor@...saru.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] lib: overflow: Always build 64-bit test cases

On Wed, May 11, 2022 at 10:45 AM Kees Cook <keescook@...omium.org> wrote:
>
> There shouldn't be a reason to not build the 64-bit test cases on 32-bit
> systems; the types exist there too. Remove the #ifdefs.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/lkml/202205110324.7GrtxG8u-lkp@intel.com
> Fixes: 455a35a6cdb6 ("lib: add runtime test of check_*_overflow functions")
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Vitor Massaru Iha <vitor@...saru.org>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: Daniel Latypov <dlatypov@...gle.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Makes sense and looks good to me, I was able to run it via
$ ./tools/testing/kunit/kunit.py run --arch=i386
--build_dir=kunit_i386/ overflow

Raw output was:
    # u64_overflow_test: 17 u64 arithmetic tests finished
    ok 7 - u64_overflow_test
    # s64_overflow_test: 21 s64 arithmetic tests finished
    ok 8 - s64_overflow_test