linux-kernel - Re: [PATCH v2] selftests/lkdtm: Use "comm" instead of "diff" for dmesg

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Date:   Thu, 10 Sep 2020 18:53:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Kees Cook <keescook@...omium.org>, Shuah Khan <shuah@...nel.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        linux-kselftest@...r.kernel.org,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Petr Mladek <pmladek@...e.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] selftests/lkdtm: Use "comm" instead of "diff" for
 dmesg

On Wed, Sep 09, 2020 at 03:35:00PM -0600, Shuah Khan wrote:
> On 9/9/20 3:17 PM, 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>
> > Cc: Shuah Khan <shuah@...nel.org>
> > Cc: linux-kselftest@...r.kernel.org
> > Fixes: f131d9edc29d ("selftests/lkdtm: Don't clear dmesg when running tests")
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> > v2: add --nocheck-order, thanks to Joe Lawrence
> > v1: https://lore.kernel.org/lkml/202006261358.3E8AA623A9@keescook/
> > ---
> >   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..bb7a1775307b 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 --nocheck-order -13 "$DMESG" - > "$LOG" || true
> >   cat "$LOG"
> >   # Check for expected output
> > 
> 
> Greg,
> 
> Would you like me to take this through kselftest tree?
> 
> If you want to take it through lkdtm tree, here is my Ack:
> 
> Acked-by: Shuah Khan <skhan@...uxfoundation.org>

Thanks, I'll take it.

greg k-h