linux-kernel - Re: [PATCH] selftests/lkdtm: Use "comm" instead of "diff" for dmesg

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Message-ID: <202009091247.C10CDA60C@keescook>
Date:   Wed, 9 Sep 2020 12:49:09 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Shuah Khan <shuah@...nel.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/lkdtm: Use "comm" instead of "diff" for dmesg


On Fri, Jun 26, 2020 at 01:59:43PM -0700, Kees Cook wrote:
> Instead of full GNU diff (which smaller boot environments may not have),
> use "comm" which is more available.
> 
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Link: https://lore.kernel.org/lkml/CA+G9fYtHP+Gg+BrR_GkBMxu2oOi-_e9pATtpb6TVRswv1G1r1Q@mail.gmail.com
> Fixes: f131d9edc29d ("selftests/lkdtm: Don't clear dmesg when running tests")
> Signed-off-by: Kees Cook <keescook@...omium.org>

Shuah, this really needs to land to fix lkdtm tests on busybox. Can
you add this to -next? (Or is it better to direct this to Greg for the
lkdtm tree?)

Thanks!

-Kees

> ---
>  tools/testing/selftests/lkdtm/run.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/lkdtm/run.sh b/tools/testing/selftests/lkdtm/run.sh
> index 8383eb89d88a..5fe23009ae13 100755
> --- a/tools/testing/selftests/lkdtm/run.sh
> +++ b/tools/testing/selftests/lkdtm/run.sh
> @@ -82,7 +82,7 @@ dmesg > "$DMESG"
>  ($SHELL -c 'cat <(echo '"$test"') >'"$TRIGGER" 2>/dev/null) || true
>  
>  # Record and dump the results
> -dmesg | diff --changed-group-format='%>' --unchanged-group-format='' "$DMESG" - > "$LOG" || true
> +dmesg | comm -13 "$DMESG" - > "$LOG" || true
>  
>  cat "$LOG"
>  # Check for expected output
> -- 
> 2.25.1
> 
> 
> -- 
> Kees Cook

-- 
Kees Cook