linux-kernel - Re: [PATCH v4 12/13] bluetooth/smp: ensure RNG is properly seeded before ECDH use

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Message-ID: <CAHmME9rEcAZop80q47n1h3PP9hx5-X6R0w-SD2nDxZZLsJOQYw@mail.gmail.com>
Date:   Thu, 8 Jun 2017 14:05:02 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     "Theodore Ts'o" <tytso@....edu>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-hardening@...ts.openwall.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers3@...il.com>,
        "Gustavo F. Padovan" <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Subject: Re: [PATCH v4 12/13] bluetooth/smp: ensure RNG is properly seeded
 before ECDH use

Hello Marcel,

On Thu, Jun 8, 2017 at 7:04 AM, Marcel Holtmann <marcel@...tmann.org> wrote:
> yes, there are plenty of commands needed before a controller becomes usable.

That doesn't clearly address with precision what Ted was wondering.
Specifically, the inquiry is: can you confirm with certainty whether
or not all calls to get_random_bytes() in the bluetooth directory are
*necessarily* going to come after a call to hci_power_on()?

Jason