linux-kernel - Re: [PATCH] Kernel selftests: Add check if tpm devices are supported

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Message-ID: <20200518215047.GA23583@dell5510>
Date:   Mon, 18 May 2020 23:50:47 +0200
From:   Petr Vorel <petr.vorel@...il.com>
To:     Nikita Sobolev <Nikita.Sobolev@...opsys.com>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        Joey Pabalinas <joeypabalinas@...il.com>,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        Jason Gunthorpe <jgg@...pe.ca>,
        Peter Huewe <peterhuewe@....de>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        linux-snps-arc@...ts.infradead.org
Subject: Re: [PATCH] Kernel selftests: Add check if tpm devices are supported

Hi Nikita,

> tpm2 tests set uses /dev/tpm0 and /dev/tpmrm0 without check if they
> are available. In case, when these devices are not available test
> fails, but expected behaviour is test to be skipped.

> Signed-off-by: Nikita Sobolev <Nikita.Sobolev@...opsys.com>
Good catch.
Reviewed-by: Petr Vorel <pvorel@...e.cz>

> ---
>  tools/testing/selftests/tpm2/test_smoke.sh | 11 +++++++++--
>  tools/testing/selftests/tpm2/test_space.sh |  9 ++++++++-
>  2 files changed, 17 insertions(+), 3 deletions(-)

> diff --git a/tools/testing/selftests/tpm2/test_smoke.sh b/tools/testing/selftests/tpm2/test_smoke.sh
> index 8155c2ea7ccb..e55d3e400666 100755
> --- a/tools/testing/selftests/tpm2/test_smoke.sh
> +++ b/tools/testing/selftests/tpm2/test_smoke.sh
> @@ -1,8 +1,15 @@
>  #!/bin/bash
>  # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)

> -python -m unittest -v tpm2_tests.SmokeTest
> -python -m unittest -v tpm2_tests.AsyncTest
> +# Kselftest framework requirement - SKIP code is 4.
> +ksft_skip=4
I hope one day kselftest adds these constants into single file :).

> +
> +if [ -f /dev/tpm0 ] ; then
> +	python -m unittest -v tpm2_tests.SmokeTest
> +	python -m unittest -v tpm2_tests.AsyncTest
> +else
> +	exit $ksft_skip
> +fi

nit: instead of if/else, I'd use shorter form:
[ -f /dev/tpm0 ] || exit $ksft_skip

python -m unittest -v tpm2_tests.SmokeTest
python -m unittest -v tpm2_tests.AsyncTest

>  CLEAR_CMD=$(which tpm2_clear)
>  if [ -n $CLEAR_CMD ]; then
> diff --git a/tools/testing/selftests/tpm2/test_space.sh b/tools/testing/selftests/tpm2/test_space.sh
> index a6f5e346635e..180b469c53b4 100755
> --- a/tools/testing/selftests/tpm2/test_space.sh
> +++ b/tools/testing/selftests/tpm2/test_space.sh
> @@ -1,4 +1,11 @@
>  #!/bin/bash
>  # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)

> -python -m unittest -v tpm2_tests.SpaceTest
> +# Kselftest framework requirement - SKIP code is 4.
> +ksft_skip=4
> +
> +if [ -f /dev/tpmrm0 ] ; then
same here.

> +	python -m unittest -v tpm2_tests.SpaceTest
> +else
> +	exit $ksft_skip
> +fi

Kind regards,
Petr