linux-kernel - Re: [PATCH v6 3/3] arm64: kexec

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Message-ID: <CAJMQK-g66_G3M9j1b2fBiMQrr5H7w4WQ5ZVy+aDdsmjb4A1==Q@mail.gmail.com>
Date:   Mon, 1 Jul 2019 12:33:36 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Miles Chen <miles.chen@...iatek.com>,
        James Morse <james.morse@....com>,
        Andrew Murray <andrew.murray@....com>,
        Jun Yao <yaojun8558363@...il.com>, Yu Zhao <yuzhao@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        Laura Abbott <labbott@...hat.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v6 3/3] arm64: kexec_file: add rng-seed support

On Fri, Jun 28, 2019 at 7:47 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:

> >
> > If the RNG wasn't initialised, we'd carry on with a warning. Why do we
> > follow a different policy here?
> >
(Sorry, please ignore previous comment)
I think this part should be same as kaslr, since they are both adding
random seeds:
If RNG isn't initialized, we won't be able to set these seeds, and dtb
can't do anything else to deal with this, so carry on with warning.
If fdt_setprop failed with no space, create_dtb() will try to setup
dtb again with more space.
Other failures are setting fdt's error, so returns invalid.