linux-kernel - Re: [kernel-hardening] [PATCH v4 07/13] ceph: ensure RNG is seeded before using

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Message-ID: <20170608024512.vjmut7buvimilpfx@thunk.org>
Date:   Wed, 7 Jun 2017 22:45:12 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     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 Miller <davem@...emloft.net>,
        Eric Biggers <ebiggers3@...il.com>,
        Ilya Dryomov <idryomov@...il.com>,
        "Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>
Subject: Re: [kernel-hardening] [PATCH v4 07/13] ceph: ensure RNG is seeded
 before using

On Tue, Jun 06, 2017 at 07:47:58PM +0200, Jason A. Donenfeld wrote:
> Ceph uses the RNG for various nonce generations, and it shouldn't accept
> using bad randomness. So, we wait for the RNG to be properly seeded. We
> do this by calling wait_for_random_bytes() in a function that is
> certainly called in process context, early on, so that all subsequent
> calls to get_random_bytes are necessarily acceptable.
> 
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> Cc: Ilya Dryomov <idryomov@...il.com>
> Cc: "Yan, Zheng" <zyan@...hat.com>
> Cc: Sage Weil <sage@...hat.com>

Thanks, applied to the dev branch.

					- Ted