linux-kernel - Re: [PATCH 5.9 639/757] random32: make prandom

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Message-ID: <20201109075410.GA13916@1wt.eu>
Date:   Mon, 9 Nov 2020 08:54:10 +0100
From:   Willy Tarreau <w@....eu>
To:     Amit Klein <aksecurity@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, tytso@....edu,
        Florian Westphal <fw@...len.de>,
        Marc Plumb <lkml.mplumb@...il.com>,
        George Spelvin <lkml@....org>, Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.9 639/757] random32: make prandom_u32() output
 unpredictable

On Mon, Nov 09, 2020 at 08:54:13AM +0200, Amit Klein wrote:
> Unfortunately, I'm just a security researcher, not a kernel developer...
> 
> Does that mean you don't plan to back-port the patch?

I could possibly have a look, but quite frankly I'm not convinced that we
need to backport this at all. I think that what we've done is mostly to be
future-proof and that the likelihood of practical attacks against live
systems with the previous fix are close to zero.

Cheers,
Willy