linux-kernel - Re: [PATCH v5 02/15] qcom_scm: scm call for deriving a software secret

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Date: Mon, 17 Jun 2024 10:33:58 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Gaurav Kashyap <quic_gaurkash@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org, 
	andersson@...nel.org, ebiggers@...gle.com, neil.armstrong@...aro.org, 
	srinivas.kandagatla@...aro.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	robh+dt@...nel.org, linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org, 
	kernel@...cinc.com, linux-crypto@...r.kernel.org, devicetree@...r.kernel.org, 
	quic_omprsing@...cinc.com, quic_nguyenb@...cinc.com, bartosz.golaszewski@...aro.org, 
	konrad.dybcio@...aro.org, ulf.hansson@...aro.org, jejb@...ux.ibm.com, 
	martin.petersen@...cle.com, mani@...nel.org, davem@...emloft.net, 
	herbert@...dor.apana.org.au, psodagud@...cinc.com, quic_apurupa@...cinc.com, 
	sonalg@...cinc.com
Subject: Re: [PATCH v5 02/15] qcom_scm: scm call for deriving a software
 secret

On Sun, Jun 16, 2024 at 05:50:57PM GMT, Gaurav Kashyap wrote:
> Inline storage encryption may require deriving a software
> secret from storage keys added to the kernel.
> 
> For non-wrapped keys, this can be directly done in the kernel as
> keys are in the clear.
> 
> However, hardware wrapped keys can only be unwrapped by the wrapping
> entity. In case of Qualcomm's wrapped key solution, this is done by
> the Hardware Key Manager (HWKM) from Trustzone.
> Hence, adding a new SCM call which in the end provides a hook
> to the software secret crypto profile API provided by the block
> layer.
> 
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Gaurav Kashyap <quic_gaurkash@...cinc.com>
> ---
>  drivers/firmware/qcom/qcom_scm.c       | 65 ++++++++++++++++++++++++++
>  drivers/firmware/qcom/qcom_scm.h       |  1 +
>  include/linux/firmware/qcom/qcom_scm.h |  2 +
>  3 files changed, 68 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry