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>
next prev parent 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAL_JsqK6B40D8dRu8KoOsx6eSzRXx6KsSEu5mjDokPEAy+p4oA@mail.gmail.com \
--to=robh@kernel.org \
--cc=bjorn.andersson@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=hector.yuan@mediatek.com \
--cc=linux-kernel@vger.kernel.org \
--cc=manivannan.sadhasivam@linaro.org \
--cc=sudeep.holla@arm.com \
--cc=viresh.kumar@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).