linux-hardening - Re: [PATCH v4 03/21] soc: qcom: Add qcom_minidump

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Date:   Wed, 28 Jun 2023 17:47:37 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mukesh Ojha <quic_mojha@...cinc.com>
Cc:     corbet@....net, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        keescook@...omium.org, tony.luck@...el.com, gpiccoli@...lia.com,
        mathieu.poirier@...aro.org, catalin.marinas@....com,
        will@...nel.org, linus.walleij@...aro.org,
        andy.shevchenko@...il.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v4 03/21] soc: qcom: Add qcom_minidump_smem module

On Wed, Jun 28, 2023 at 06:04:30PM +0530, Mukesh Ojha wrote:
> Add qcom_minidump_smem module in a preparation to remove smem
> based minidump specific code from driver/remoteproc/qcom_common.c
> and provide needed exported API, this abstract minidump specific
> data layout from qualcomm's remoteproc driver.
> 
> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
> ---
>  drivers/soc/qcom/Kconfig              |   8 ++
>  drivers/soc/qcom/qcom_minidump_smem.c | 147 ++++++++++++++++++++++++++++++++++
>  include/soc/qcom/qcom_minidump.h      |  24 ++++++
>  3 files changed, 179 insertions(+)
>  create mode 100644 drivers/soc/qcom/qcom_minidump_smem.c
>  create mode 100644 include/soc/qcom/qcom_minidump.h
> 
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index a491718f8064..982310b5a1cb 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -279,4 +279,12 @@ config QCOM_INLINE_CRYPTO_ENGINE
>  	tristate
>  	select QCOM_SCM
>  
> +config QCOM_MINIDUMP_SMEM
> +	tristate "QCOM Minidump SMEM (as backend) Support"
> +	depends on ARCH_QCOM
> +	depends on QCOM_SMEM
> +	help
> +	  Enablement of core minidump feature is controlled from boot firmware
> +	  side, and this config allow linux to query minidump segments associated
> +	  with the remote processor and check its validity.

I can not understand this help text, sorry.  Also, what is the module
name?

And why is this only with ARCH_QCOM?  Why are we doing ARCH_PLATFORM
symbols still?  why is that a thing for a generic cpu type?

And don't you want build coverage?  Why not allow that?

thanks,

greg k-h