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From: Sedat Dilek <sedat.dilek@gmail.com>
To: Amit Klein <aksecurity@gmail.com>
Cc: Willy Tarreau <w@1wt.eu>, David Laight <David.Laight@aculab.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
George Spelvin <lkml@sdf.org>, Eric Dumazet <edumazet@google.com>,
"Jason A. Donenfeld" <Jason@zx2c4.com>,
Andy Lutomirski <luto@kernel.org>,
Kees Cook <keescook@chromium.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
"tytso@mit.edu" <tytso@mit.edu>, Florian Westphal <fw@strlen.de>,
Marc Plumb <lkml.mplumb@gmail.com>
Subject: Re: [PATCH 1/2] random32: make prandom_u32() output unpredictable
Date: Mon, 14 Sep 2020 18:16:40 +0200 [thread overview]
Message-ID: <CA+icZUUmQeww+94dVOe1JFFQRkvUYVZP3g2GP+gOsdX4kP4x+A@mail.gmail.com> (raw)
In-Reply-To: <CANEQ_+Kuw6cxWRBE6NyXkr=8p3W-1f=o1q91ZESeueEnna9fvw@mail.gmail.com>
On Mon, Sep 14, 2020 at 4:53 PM Amit Klein <aksecurity@gmail.com> wrote:
>
> Hi
>
> Is this patch being pushed to any branch? I don't see it deployed anywhere (unless I'm missing something...).
>
It's here:
[1] https://git.kernel.org/pub/scm/linux/kernel/git/wtarreau/prandom.git/log/?h=20200901-siphash-noise
> Best,
> -Amit
>
>
>
> On Tue, Sep 1, 2020 at 4:16 PM Willy Tarreau <w@1wt.eu> wrote:
>>
>> On Tue, Sep 01, 2020 at 01:10:18PM +0000, David Laight wrote:
>> > From: Willy Tarreau
>> > > Sent: 01 September 2020 07:43
>> > ...
>> > > +/*
>> > > + * 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;
>> >
>> > Isn't jiffies likely to be zero here?
>>
>> I don't know. But do we really care ? I'd personally have been fine
>> with not even assigning it in this case and leaving whatever was in
>> the stack in this case, though it could make some static code analyzer
>> unhappy.
>>
>> Willy
next prev parent reply other threads:[~2020-09-14 16:18 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-01 6:43 [PATCH 0/2] prandom_u32: make output less predictable Willy Tarreau
2020-09-01 6:43 ` [PATCH 1/2] random32: make prandom_u32() output unpredictable Willy Tarreau
2020-09-01 8:33 ` Yann Ylavic
2020-09-01 8:39 ` Willy Tarreau
2020-09-01 8:46 ` Sedat Dilek
2020-09-01 8:56 ` Willy Tarreau
2020-09-01 9:26 ` Sedat Dilek
2020-09-01 13:10 ` David Laight
2020-09-01 13:16 ` Willy Tarreau
[not found] ` <CANEQ_+Kuw6cxWRBE6NyXkr=8p3W-1f=o1q91ZESeueEnna9fvw@mail.gmail.com>
2020-09-14 16:16 ` Sedat Dilek [this message]
2020-09-14 16:29 ` Willy Tarreau
2020-09-14 16:48 ` Sedat Dilek
2020-09-01 6:43 ` [PATCH 2/2] random32: add noise from network and scheduling activity Willy Tarreau
2020-09-01 10:24 ` Eric Dumazet
2020-09-01 11:57 ` Willy Tarreau
2020-09-01 14:41 ` [PATCH 0/2] prandom_u32: make output less predictable Sedat Dilek
2020-09-01 14:55 ` Willy Tarreau
2020-09-01 15:19 ` Eric Dumazet
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