linux-kernel - Re: [PATCH v2 02/11] test_firmware: replace syfs fallback check with kconfig

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Date:   Tue, 27 Feb 2018 15:09:12 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Martin Fuzzey <mfuzzey@...keon.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        David Howells <dhowells@...hat.com>, pali.rohar@...il.com,
        Takashi Iwai <tiwai@...e.de>, arend.vanspriel@...adcom.com,
        Rafał Miłecki <zajec5@...il.com>,
        nbroeking@...com, Vikram Mulukutla <markivx@...eaurora.org>,
        stephen.boyd@...aro.org, Mark Brown <broonie@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Abhay_Salunke@...l.com, bjorn.andersson@...aro.org,
        jewalt@...innovations.com, LKML <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2 02/11] test_firmware: replace syfs fallback check with
 kconfig_has helper

On Fri, Feb 23, 2018 at 6:46 PM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> Now that we have a kconfig checker just use that instead of relying
> on testing a sysfs directory being present, since our requirements
> are spelled out.

I don't see the reason to depend on config.gz, but it's a reasonable
requirement for a test build.

> Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  tools/testing/selftests/firmware/fw_fallback.sh | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/tools/testing/selftests/firmware/fw_fallback.sh b/tools/testing/selftests/firmware/fw_fallback.sh
> index a42e437363d9..40b6c1d3e832 100755
> --- a/tools/testing/selftests/firmware/fw_fallback.sh
> +++ b/tools/testing/selftests/firmware/fw_fallback.sh
> @@ -49,10 +49,7 @@ kconfig_has()
>
>  DIR=/sys/devices/virtual/misc/test_firmware
>
> -# CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
> -# These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
> -# as an indicator for CONFIG_FW_LOADER_USER_HELPER.
> -HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
> +HAS_FW_LOADER_USER_HELPER=$(kconfig_has CONFIG_FW_LOADER_USER_HELPER=y)
>  HAS_FW_LOADER_USER_HELPER_FALLBACK=$(kconfig_has CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y)
>
>  if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
> --
> 2.16.2
>



-- 
Kees Cook
Pixel Security