linux-kernel - Re: [PATCH 1/2] random32: make prandom

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Message-ID: <CA+icZUXjDaoLG36X7Jd7i6=Ncf6xTm44qL7ZV+i7pmNgtLuJSA@mail.gmail.com>
Date:   Tue, 1 Sep 2020 10:46:16 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Willy Tarreau <w@....eu>
Cc:     Yann Ylavic <ylavic.dev@...il.com>, linux-kernel@...r.kernel.org,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        George Spelvin <lkml@....org>,
        Amit Klein <aksecurity@...il.com>,
        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>
Subject: Re: [PATCH 1/2] random32: make prandom_u32() output unpredictable

On Tue, Sep 1, 2020 at 10:39 AM Willy Tarreau <w@....eu> wrote:
>
> On Tue, Sep 01, 2020 at 10:33:40AM +0200, Yann Ylavic wrote:
> > On Tue, Sep 1, 2020 at 8:45 AM Willy Tarreau <w@....eu> wrote:
> > >
> > > +/*
> > > + *     Generate some initially weak seeding values to allow
> > > + *     the prandom_u32() engine to be started.
> > > + */
> > > +static int __init prandom_init_early(void)
> > > +{
> > > +       int i;
> > > +       unsigned long v0, v1, v2, v3;
> > > +
> > > +       if (!arch_get_random_long(&v0))
> > > +               v0 = jiffies;
> > > +       if (!arch_get_random_long(&v1))
> > > +               v0 = random_get_entropy();
> >
> > Shouldn't the above be:
> >                   v1 = random_get_entropy();
> > ?
>
> Very good catch, many thanks Yann! Now fixed in my local tree.
>

Thanks for offering a new patchset, Willy.

Will you push the updated patchset to your prandom Git - for easy fetching?

Thanks.

- Sedat -

[1] https://git.kernel.org/pub/scm/linux/kernel/git/wtarreau/prandom.git/