linux-kernel - Re: [PATCH v2 1/2] selftests: lib: Skip tests on missing test modules

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Date:   Mon, 19 Jun 2017 11:51:47 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sumit Semwal <sumit.semwal@...aro.org>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        decot@...glers.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] selftests: lib: Skip tests on missing test modules

On Mon, Jun 19, 2017 at 6:44 AM, Sumit Semwal <sumit.semwal@...aro.org> wrote:
> With older kernels, printf.sh and bitmap.sh fail because they can't find
> the respective test modules they are looking for.
>
> Add the skip portion on missing the respective test_XXX module. Error out
> with the same error code as prime_numbers.sh.
>
> v2: Per Shuah's review, search for the module rather than do modprobe.
>
> Signed-off-by: Sumit Semwal <sumit.semwal@...aro.org>
> ---
>  tools/testing/selftests/lib/bitmap.sh | 6 ++++++
>  tools/testing/selftests/lib/printf.sh | 6 ++++++
>  2 files changed, 12 insertions(+)
>
> diff --git a/tools/testing/selftests/lib/bitmap.sh b/tools/testing/selftests/lib/bitmap.sh
> index 2da187b6ddad..b893046d511f 100755
> --- a/tools/testing/selftests/lib/bitmap.sh
> +++ b/tools/testing/selftests/lib/bitmap.sh
> @@ -1,6 +1,12 @@
>  #!/bin/sh
>  # Runs bitmap infrastructure tests using test_bitmap kernel module
>
> +if ! find /lib/modules/$(uname -r) -type f -name test_bitmap.ko | grep -q .;
> +then
> +       echo "bitmap: test_bitmap.ko not found [SKIP]"
> +       exit 77
> +fi
> +
>  if /sbin/modprobe -q test_bitmap; then
>         /sbin/modprobe -q -r test_bitmap
>         echo "bitmap: ok"
> diff --git a/tools/testing/selftests/lib/printf.sh b/tools/testing/selftests/lib/printf.sh
> index 4fdc70fe6980..804b7e75acc0 100755
> --- a/tools/testing/selftests/lib/printf.sh
> +++ b/tools/testing/selftests/lib/printf.sh
> @@ -1,6 +1,12 @@
>  #!/bin/sh
>  # Runs printf infrastructure using test_printf kernel module
>
> +if ! find /lib/modules/$(uname -r) -type f -name test_printf.ko | grep -q .;
> +then
> +        echo "printf: test_printf.ko not found [SKIP]"
> +        exit 77
> +fi
> +
>  if /sbin/modprobe -q test_printf; then
>         /sbin/modprobe -q -r test_printf
>         echo "printf: ok"

This doesn't seem right to me. Can't these be built-ins too?

-Kees

-- 
Kees Cook
Pixel Security