From: Viresh Kumar <viresh.kumar@linaro.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
Rob Herring <robh@kernel.org>,
Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
Hector Yuan <hector.yuan@mediatek.com>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v2] dt-bindings: dvfs: Add support for generic performance domains
Date: Tue, 17 Nov 2020 10:19:11 +0530 [thread overview]
Message-ID: <20201117044911.hzmmkasmgpnaxu3m@vireshk-i7> (raw)
In-Reply-To: <20201116181356.804590-1-sudeep.holla@arm.com>
On 16-11-20, 18:13, Sudeep Holla 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
>
> Cc: Rob Herring <robh+dt@kernel.org>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> .../bindings/dvfs/performance-domain.yaml | 76 +++++++++++++++++++
> 1 file changed, 76 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/dvfs/performance-domain.yaml
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
--
viresh
next prev parent reply other threads:[~2020-11-17 4:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-16 18:13 [PATCH v2] dt-bindings: dvfs: Add support for generic performance domains Sudeep Holla
2020-11-17 4:49 ` Viresh Kumar [this message]
2020-11-18 21:17 ` Rob Herring
2020-11-18 21:20 ` Rob Herring
2020-11-19 15:21 ` Sudeep Holla
2021-03-30 13:32 ` Rob Herring
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