netdev - Re: Flaw in "random32: update the net random state on interrupt and activity"

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Date:   Sat, 8 Aug 2020 13:52:37 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     George Spelvin <lkml@....org>
Cc:     Willy Tarreau <w@....eu>, Netdev <netdev@...r.kernel.org>,
        Amit Klein <aksecurity@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Theodore Ts'o" <tytso@....edu>,
        Marc Plumb <lkml.mplumb@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: Flaw in "random32: update the net random state on interrupt and activity"

On Sat, Aug 8, 2020 at 1:47 PM George Spelvin <lkml@....org> wrote:
>
> I *just* finished explaining, using dribs and drabs of entropy allows an
> *information theoretical attack* which *no* crypto can prevent.

The key word here being "theoretical".

The other key word is "reality".

We will have to agree to disagree. I don't _care_ about the
theoretical holes. I care about the real ones.

We plugged a real one. Deal with it.

              Linus