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Message-ID: <CAHUa44EsO9rr2_KsmNcwoUuL_OAO-Oh8gqepUn5Bmo1dfP_LUA@mail.gmail.com>
Date: Fri, 26 Apr 2024 15:08:07 +0200
From: Jens Wiklander <jens.wiklander@...aro.org>
To: Manuel Traut <manut@...ka.net>
Cc: linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
op-tee@...ts.trustedfirmware.org,
Shyam Saini <shyamsaini@...ux.microsoft.com>, Ulf Hansson <ulf.hansson@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>, Jerome Forissier <jerome.forissier@...aro.org>,
Sumit Garg <sumit.garg@...aro.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>,
Bart Van Assche <bvanassche@....org>, Randy Dunlap <rdunlap@...radead.org>,
Ard Biesheuvel <ardb@...nel.org>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Tomas Winkler <tomas.winkler@...el.com>,
Alex Bennée <alex.bennee@...aro.org>
Subject: Re: [PATCH v5 1/3] rpmb: add Replay Protected Memory Block (RPMB) subsystem
On Thu, Apr 25, 2024 at 10:37 AM Manuel Traut <manut@...ka.net> wrote:
>
> On Mon, Apr 22, 2024 at 11:19:34AM +0200, Jens Wiklander wrote:
> > A number of storage technologies support a specialised hardware
> > partition designed to be resistant to replay attacks. The underlying
> > HW protocols differ but the operations are common. The RPMB partition
> > cannot be accessed via standard block layer, but by a set of specific
> > RPMB commands. Such a partition provides authenticated and replay
> > protected access, hence suitable as a secure storage.
> >
> > The initial aim of this patch is to provide a simple RPMB driver
> > interface which can be accessed by the optee driver to facilitate early
> > RPMB access to OP-TEE OS (secure OS) during the boot time.
> >
> > A TEE device driver can claim the RPMB interface, for example, via
> > rpmb_interface_register() or rpmb_dev_find_device(). The RPMB driver
> > provides a callback to route RPMB frames to the RPMB device accessible
> > via rpmb_route_frames().
> >
> > The detailed operation of implementing the access is left to the TEE
> > device driver itself.
> >
> > Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> > Signed-off-by: Alex Bennée <alex.bennee@...aro.org>
> > Signed-off-by: Shyam Saini <shyamsaini@...ux.microsoft.com>
> > Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> > Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> > ---
> > MAINTAINERS | 7 ++
> > drivers/misc/Kconfig | 10 ++
> > drivers/misc/Makefile | 1 +
> > drivers/misc/rpmb-core.c | 232 +++++++++++++++++++++++++++++++++++++++
> > include/linux/rpmb.h | 136 +++++++++++++++++++++++
> > 5 files changed, 386 insertions(+)
> > create mode 100644 drivers/misc/rpmb-core.c
> > create mode 100644 include/linux/rpmb.h
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 8999497011a2..e83152c42499 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -19012,6 +19012,13 @@ T: git git://linuxtv.org/media_tree.git
> > F: Documentation/devicetree/bindings/media/allwinner,sun8i-a83t-de2-rotate.yaml
> > F: drivers/media/platform/sunxi/sun8i-rotate/
> >
> > +RPMB SUBSYSTEM
> > +M: Jens Wiklander <jens.wiklander@...aro.org>
> > +L: linux-kernel@...r.kernel.org
> > +S: Supported
> > +F: drivers/misc/rpmb-core.c
> > +F: include/linux/rpmb.h
> > +
> > RPMSG TTY DRIVER
> > M: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> > L: linux-remoteproc@...r.kernel.org
> > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> > index 4fb291f0bf7c..dbff9e8c3a03 100644
> > --- a/drivers/misc/Kconfig
> > +++ b/drivers/misc/Kconfig
> > @@ -104,6 +104,16 @@ config PHANTOM
> > If you choose to build module, its name will be phantom. If unsure,
> > say N here.
> >
> > +config RPMB
> > + tristate "RPMB partition interface"
> > + depends on MMC
> > + help
> > + Unified RPMB unit interface for RPMB capable devices such as eMMC and
> > + UFS. Provides interface for in-kernel security controllers to access
> > + RPMB unit.
> > +
> > + If unsure, select N.
> > +
> > config TIFM_CORE
> > tristate "TI Flash Media interface support"
> > depends on PCI
> > diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> > index ea6ea5bbbc9c..8af058ad1df4 100644
> > --- a/drivers/misc/Makefile
> > +++ b/drivers/misc/Makefile
> > @@ -15,6 +15,7 @@ obj-$(CONFIG_LKDTM) += lkdtm/
> > obj-$(CONFIG_TIFM_CORE) += tifm_core.o
> > obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o
> > obj-$(CONFIG_PHANTOM) += phantom.o
> > +obj-$(CONFIG_RPMB) += rpmb-core.o
> > obj-$(CONFIG_QCOM_COINCELL) += qcom-coincell.o
> > obj-$(CONFIG_QCOM_FASTRPC) += fastrpc.o
> > obj-$(CONFIG_SENSORS_BH1770) += bh1770glc.o
> > diff --git a/drivers/misc/rpmb-core.c b/drivers/misc/rpmb-core.c
> > new file mode 100644
> > index 000000000000..5479469c26f3
> > --- /dev/null
> > +++ b/drivers/misc/rpmb-core.c
> > @@ -0,0 +1,232 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright(c) 2015 - 2019 Intel Corporation. All rights reserved.
> > + * Copyright(c) 2021 - 2024 Linaro Ltd.
> > + */
> > +#include <linux/device.h>
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/list.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/rpmb.h>
> > +#include <linux/slab.h>
> > +
> > +static struct list_head rpmb_dev_list;
> > +static DEFINE_MUTEX(rpmb_mutex);
> > +static struct blocking_notifier_head rpmb_interface =
> > + BLOCKING_NOTIFIER_INIT(rpmb_interface);
> > +
> > +/**
> > + * rpmb_dev_get() - increase rpmb device ref counter
> > + * @rdev: rpmb device
> > + */
> > +struct rpmb_dev *rpmb_dev_get(struct rpmb_dev *rdev)
> > +{
> > + if (rdev)
> > + get_device(rdev->parent_dev);
> > + return rdev;
> > +}
> > +EXPORT_SYMBOL_GPL(rpmb_dev_get);
> > +
> > +/**
> > + * rpmb_dev_put() - decrease rpmb device ref counter
> > + * @rdev: rpmb device
> > + */
> > +void rpmb_dev_put(struct rpmb_dev *rdev)
> > +{
> > + if (rdev)
> > + put_device(rdev->parent_dev);
> > +}
> > +EXPORT_SYMBOL_GPL(rpmb_dev_put);
> > +
> > +/**
> > + * rpmb_route_frames() - route rpmb frames to rpmb device
> > + * @rdev: rpmb device
> > + * @req: rpmb request frames
> > + * @req_len: length of rpmb request frames in bytes
> > + * @rsp: rpmb response frames
> > + * @rsp_len: length of rpmb response frames in bytes
> > + *
> > + * Returns: < 0 on failure
> > + */
> > +int rpmb_route_frames(struct rpmb_dev *rdev, u8 *req,
> > + unsigned int req_len, u8 *rsp, unsigned int rsp_len)
> > +{
> > + if (!req || !req_len || !rsp || !rsp_len)
> > + return -EINVAL;
> > +
> > + return rdev->descr.route_frames(rdev->parent_dev, req, req_len,
> > + rsp, rsp_len);
> > +}
> > +EXPORT_SYMBOL_GPL(rpmb_route_frames);
> > +
> > +/**
> > + * rpmb_dev_find_device() - return first matching rpmb device
> > + * @data: data for the match function
> > + * @match: the matching function
> > + *
> > + * Iterate over registered RPMB devices, and call @match() for each passing
> > + * it the RPMB device and @data.
> > + *
> > + * The return value of @match() is checked for each call. If it returns
> > + * anything other 0, break and return the found RPMB device.
> > + *
> > + * It's the callers responsibility to call rpmb_dev_put() on the returned
> > + * device, when it's done with it.
> > + *
> > + * Returns: a matching rpmb device or NULL on failure
> > + */
> > +struct rpmb_dev *rpmb_dev_find_device(const void *data,
> > + const struct rpmb_dev *start,
> > + int (*match)(struct rpmb_dev *rdev,
> > + const void *data))
> > +{
> > + struct rpmb_dev *rdev;
> > + struct list_head *pos;
> > +
> > + mutex_lock(&rpmb_mutex);
> > + if (start)
> > + pos = start->list_node.next;
> > + else
> > + pos = rpmb_dev_list.next;
> > +
> > + while (pos != &rpmb_dev_list) {
> > + rdev = container_of(pos, struct rpmb_dev, list_node);
> > + if (match(rdev, data)) {
> > + rpmb_dev_get(rdev);
> > + goto out;
> > + }
> > + pos = pos->next;
> > + }
> > + rdev = NULL;
> > +
> > +out:
> > + mutex_unlock(&rpmb_mutex);
> > +
> > + return rdev;
> > +}
>
> EXPORT_SYMBOL_GPL missing?
You're right, I'll add it.
Thanks,
Jens
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