From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Kate Stewart <kstewart@linuxfoundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Mukesh Ojha <mojha@codeaurora.org>,
Grzegorz Halat <ghalat@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>,
Guenter Roeck <groeck@chromium.org>,
Will Deacon <will@kernel.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Rob Herring <robh@kernel.org>,
Daniel Thompson <daniel.thompson@linaro.org>,
Anders Roxell <anders.roxell@linaro.org>,
Yury Norov <ynorov@marvell.com>, Marc Zyngier <maz@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Aaro Koskinen <aaro.koskinen@nokia.com>,
Ingo Molnar <mingo@redhat.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Waiman Long <longman@redhat.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Wei Li <liwei391@huawei.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Len Brown <len.brown@intel.com>,
Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
Rik van Riel <riel@surriel.com>,
Stephen Boyd <swboyd@chromium.org>,
Shaokun Zhang <zhangshaokun@hisilicon.com>,
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Borislav Petkov <bp@alien8.de>,
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linux-arm-kernel@lists.infradead.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
linux-kernel@vger.kernel.org, Armijn Hemel <armijn@tjaldur.nl>,
Jiri Kosina <jkosina@suse.cz>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
"David S . Miller" <davem@davemloft.net>
Subject: Re: [PATCH v9 2/3] fdt: add support for rng-seed
Date: Thu, 22 Aug 2019 12:03:52 -0400 [thread overview]
Message-ID: <20190822160352.GA17783@mit.edu> (raw)
In-Reply-To: <20190822071522.143986-3-hsinyi@chromium.org>
On Thu, Aug 22, 2019 at 03:15:22PM +0800, Hsin-Yi Wang wrote:
> Introducing a chosen node, rng-seed, which is an entropy that can be
> passed to kernel called very early to increase initial device
> randomness. Bootloader should provide this entropy and the value is
> read from /chosen/rng-seed in DT.
>
> Obtain of_fdt_crc32 for CRC check after early_init_dt_scan_nodes(),
> since early_init_dt_scan_chosen() would modify fdt to erase rng-seed.
>
> Add a new interface add_bootloader_randomness() for rng-seed use case.
> Depends on whether the seed is trustworthy, rng seed would be passed to
> add_hwgenerator_randomness(). Otherwise it would be passed to
> add_device_randomness(). Decision is controlled by kernel config
> RANDOM_TRUST_BOOTLOADER.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> Reviewed-by: Rob Herring <robh@kernel.org>
For the changes to drivers/char/random.c:
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
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next prev parent reply other threads:[~2019-08-22 16:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-22 7:15 [PATCH v9 0/3] add support for rng-seed Hsin-Yi Wang
2019-08-22 7:15 ` [PATCH v9 1/3] arm64: map FDT as RW for early_init_dt_scan() Hsin-Yi Wang
2019-08-22 7:15 ` [PATCH v9 2/3] fdt: add support for rng-seed Hsin-Yi Wang
2019-08-22 16:03 ` Theodore Y. Ts'o [this message]
2019-08-22 17:39 ` Stephen Boyd
2019-08-24 19:04 ` Kees Cook
2019-08-29 10:03 ` Hsin-Yi Wang
2019-08-29 15:45 ` Theodore Y. Ts'o
2019-08-29 16:25 ` Kees Cook
2019-08-29 16:22 ` Kees Cook
2019-08-22 7:15 ` [PATCH v9 3/3] arm64: kexec_file: add rng-seed support Hsin-Yi Wang
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