linux-kernel - Re: [PATCH] random: silence compiler warnings and fix race

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Message-ID: <CAH8yC8n-2SuRg3oD7pDRH8itJRoifSo=GQq13dDKBK1yjM_hoA@mail.gmail.com>
Date:   Wed, 21 Jun 2017 19:50:48 -0400
From:   Jeffrey Walton <noloader@...il.com>
To:     "Theodore Ts'o" <tytso@....edu>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Jeffrey Walton <noloader@...il.com>, tglx@...akpoint.cc,
        David Miller <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Eric Biggers <ebiggers3@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel-hardening@...ts.openwall.com,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH] random: silence compiler warnings and fix race

On Tue, Jun 20, 2017 at 7:38 PM, Theodore Ts'o <tytso@....edu> wrote:
> On Tue, Jun 20, 2017 at 11:49:07AM +0200, Jason A. Donenfeld wrote:
>> ...
>>> I more or less agree with you that we should just turn this on for all
>>> users and they'll just have to live with the spam and report odd
>>> entries, and overtime we'll fix all the violations.
>
> There seems to be a fundamental misapprehension that it will be easy
> to "fix all the violations".  For certain hardware types, this is
> not easy, and the "eh, let them get spammed until we get around to
> fixing it" attitude is precisely what I was pushing back against.

I can't speak for others, but for me: I think they will fall into
three categories:

 1. easy to fix
 2. difficult to fix
 3. unable to fix

(1) is low hanging fruit and they will probably (hopefully?) be
cleared easily.  Like systemd on x86_64 with rdrand and rdseed.
There's no reason for systemd to find itself starved of entropy on
that platform. (cf., http://github.com/systemd/systemd/issues/4167).

Organizations that find themselves in (3) can choose to use a board or
server and accept the risk, or they can choose to remediate it in
another way. The "other way" may include a capital expenditure and a
hardware refresh.

The central point is, they know about the risk and they can make the decision.

Jeff