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From: Rob Herring <robh@kernel.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	devicetree@vger.kernel.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
	Hector Yuan <hector.yuan@mediatek.com>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>
Subject: Re: [PATCH v4] dt-bindings: dvfs: Add support for generic performance domains
Date: Mon, 17 May 2021 14:17:05 -0500	[thread overview]
Message-ID: <CAL_JsqK6B40D8dRu8KoOsx6eSzRXx6KsSEu5mjDokPEAy+p4oA@mail.gmail.com> (raw)
In-Reply-To: <20210517155458.1016707-1-sudeep.holla@arm.com>

On Mon, May 17, 2021 at 10:55 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> The CLKSCREW attack [0] exposed security vulnerabilities in energy management
> implementations where untrusted software had direct access to clock and
> voltage hardware controls. In this attack, the malicious software was able to
> place the platform into unsafe overclocked or undervolted configurations. Such
> configurations then enabled the injection of predictable faults to reveal
> secrets.
>
> Many Arm-based systems used to or still use voltage regulator and clock
> frameworks in the kernel. These frameworks allow callers to independently
> manipulate frequency and voltage settings. Such implementations can render
> systems susceptible to this form of attack.
>
> Attacks such as CLKSCREW are now being mitigated by not having direct and
> independent control of clock and voltage in the kernel and moving that
> control to a trusted entity, such as the SCP firmware or secure world
> firmware/software which are to perform sanity checking on the requested
> performance levels, thereby preventing any attempted malicious programming.
>
> With the advent of such an abstraction, there is a need to replace the
> generic clock and regulator bindings used by such devices with a generic
> performance domains bindings.
>
> [0] https://www.usenix.org/conference/usenixsecurity17/technical-sessions/presentation/tang
>
> Link: https://lore.kernel.org/r/20201116181356.804590-1-sudeep.holla@arm.com
> Cc: Rob Herring <robh+dt@kernel.org>
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

Reviewed-by: Rob Herring <robh@kernel.org>

  reply	other threads:[~2021-05-17 19:17 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-17 15:54 [PATCH v4] dt-bindings: dvfs: Add support for generic performance domains Sudeep Holla
2021-05-17 19:17 ` Rob Herring [this message]
2021-05-19 11:23   ` Sudeep Holla
2021-05-20  3:54     ` Viresh Kumar
2021-05-17 20:45 ` Rob Herring
2021-05-19 11:20   ` Sudeep Holla
2021-05-20 19:43     ` Rob Herring
2021-05-21  4:08       ` Viresh Kumar
2021-05-21 15:24         ` Sudeep Holla
2021-05-24  9:17           ` Viresh Kumar
2021-05-24 10:05             ` Sudeep Holla
2021-10-14 10:56 ` Ulf Hansson
2021-10-14 14:55   ` Sudeep Holla
2021-10-15  9:17     ` Ulf Hansson
2021-10-19  7:24       ` Viresh Kumar
2021-10-19 13:58         ` Ulf Hansson
2021-10-20  6:24           ` Viresh Kumar
2021-10-20 10:25       ` Sudeep Holla
2021-10-21 13:34         ` Ulf Hansson
2021-10-21 15:35           ` Sudeep Holla
2021-10-20 12:11       ` Rob Herring
2021-10-21 13:13         ` Ulf Hansson
2021-10-21 13:33           ` Sudeep Holla
2021-10-21 16:01             ` Ulf Hansson

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